CVE-2026-71889
published 2026-10-03CVE-2026-71889: In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy…
PriorityP348high8.7CVSS 4.0
AVNACLATNPRNUINVCNVIHVANSCNSINSANEXCRXIRXARXMAVXMACXMATXMPRXMUIXMVCXMVIXMVAXMSCXMSIXMSAXSXAUXRXVXREXUAmber
EPSS
0.17%
5.6th percentile
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath ordering, so the permitted and excluded subtree checks of RFC 5280 sec. 6.1.3 (b) and (c) never ran against the leaf's subject DN or its subjectAltName. A chain whose leaf violated a NameConstraints extension imposed by its own issuing CA therefore reported isValidCertPath() true with an empty error list, while CertPathValidator.getInstance("PKIX", "BC"), which shares no code with the reviewer, rejected the identical chain against the identical trust anchor. An application using the reviewer to make the trust decision rather than for diagnostics alongside a real validation accepted a certificate the constrained CA was never authorised to issue. Both copies now check every certificate in the path including the target, waive the sec. 4.2.1.10 self-issued exemption for the final certificate as sec. 6.1.3 requires, and skip the sec. 6.1.4 (g) constraint-accumulation step for the target. This issue also affects Bouncy Castle for Java LTS before 2.73.13, which carries only the org.bouncycastle.pkix.jcajce copy of the reviewer. It also affects Bouncy Castle for Java FIPS (BC-FJA) before bcpkix-fips 1.0.13 (1.0.X series), 2.0.13 (2.0.X series) and 2.1.13 (2.1.X series).
Affected
20 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| candlepinproject | candlepin | — | — |
| devspaces | jetbrains-ide-rhel9 | — | — |
| devspaces | openvsx-rhel9 | — | — |
| devspaces | pluginregistry-rhel9 | — | — |
| jboss-eap-7 | eap74-els-openjdk11-openshift-rhel8 | — | — |
| jboss-eap-7 | eap74-els-openjdk17-openshift-rhel8 | — | — |
| jboss-eap-7 | eap74-els-openjdk8-openshift-rhel8 | — | — |
| jenkins | jenkins | — | — |
| legion_of_the_bouncy_castle_inc | bc-fja | >= 1.0.4 < 1.0.13 | 1.0.13 |
| legion_of_the_bouncy_castle_inc | bc-fja | >= 2.0.0 < 2.0.13 | 2.0.13 |
| legion_of_the_bouncy_castle_inc | bc-fja | >= 2.1.0 < 2.1.13 | 2.1.13 |
| legion_of_the_bouncy_castle_inc | bc-java | < 1.86 | 1.86 |
| legion_of_the_bouncy_castle_inc | bc-lts-java | >= 2.73.0 < 2.73.13 | 2.73.13 |
| ocp-tools-4 | jenkins-rhel8 | — | — |
| ocp-tools-4 | jenkins-rhel9 | — | — |
| org.bouncycastle | bcpkix-jdk18on_1.86.0.redhat-00001 | — | — |
| pki-deps_10.6 | resteasy | — | — |
| redhat | resteasy | — | — |
| rhbk | keycloak-rhel9 | — | — |
| rhoai | odh-modelmesh-rhel9 | — | — |
CVSS provenance
nvdv4.08.7HIGHCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:Amber
vendor_redhat8.7HIGH
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.50
ghsa_unreviewed·2026-10-03
CVE-2026-71889 [HIGH] CWE-295 In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.50
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath ordering, so the permitted and excluded subtree checks of RFC 5280 sec. 6.1.3 (b) and (c) never ran against the leaf's subject DN or its subjectAltName. A chain whose leaf violated a NameConstraints extension imposed by its own issuing CA therefore reported isValidCertPath() true with an empty error list, while CertPathValidator.getInstance("PKIX", "
VulDB
Legion of the Bouncy Castle BC-JAVA/BC-LTS-JAVA/BC-FJA prior 1.86/2.73.13/1.0.13/2.0.13/2.1.13 Certificate Path Reviewer PKIXCertPathReviewer.java isValidCertPath certificate validation
vuldb·2026-10-03·CVSS 8.7
CVE-2026-71889 [HIGH] Legion of the Bouncy Castle BC-JAVA/BC-LTS-JAVA/BC-FJA prior 1.86/2.73.13/1.0.13/2.0.13/2.1.13 Certificate Path Reviewer PKIXCertPathReviewer.java isValidCertPath certificate validation
A vulnerability, which was classified as problematic, has been found in Legion of the Bouncy Castle BC-JAVA, BC-LTS-JAVA and BC-FJA. Affected by this issue is the function isValidCertPath of the file org/bouncycastle/pkix/jcajce/PKIXCertPathReviewer.java of the component Certificate Path Reviewer. Performing a manipulation results in improper certificate validation.
This vulnerability is reported as CVE-2026-71889. The attack is possible to be carried out remotely. No exploit exists.
It is advisable to upgrade the affected component.
Red Hat
org.bouncycastle/bcpkix-jdk18on: org.bouncycastle/bcpkix-fips: org.bouncycastle/bcpkix-jdk15on: org.bouncycastle/bcpkix-lts8on: bouncycastle: Bouncy Castle: Certificate validation bypass via missing n
vendor_redhat·2026-10-03·CVSS 8.7
CVE-2026-71889 [HIGH] CWE-295 org.bouncycastle/bcpkix-jdk18on: org.bouncycastle/bcpkix-fips: org.bouncycastle/bcpkix-jdk15on: org.bouncycastle/bcpkix-lts8on: bouncycastle: Bouncy Castle: Certificate validation bypass via missing n
org.bouncycastle/bcpkix-jdk18on: org.bouncycastle/bcpkix-fips: org.bouncycastle/bcpkix-jdk15on: org.bouncycastle/bcpkix-lts8on: bouncycastle: Bouncy Castle: Certificate validation bypass via missing name constraint checks
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath ordering, so the permitted and excluded subtree checks of RFC 5280 sec. 6.1.3 (b) and (c) never ran against the leaf's subject DN
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-71889 voms-api-java: Bouncy Castle: Certificate validation bypass via missing name constraint checks [epel-all]
bugzilla·2026-10-14·CVSS 8.7
CVE-2026-71889 [HIGH] CVE-2026-71889 voms-api-java: Bouncy Castle: Certificate validation bypass via missing name constraint checks [epel-all]
CVE-2026-71889 voms-api-java: Bouncy Castle: Certificate validation bypass via missing name constraint checks [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath order
Bugzilla
CVE-2026-71889 voms-api-java: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
bugzilla·2026-10-14·CVSS 8.7
CVE-2026-71889 [HIGH] CVE-2026-71889 voms-api-java: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
CVE-2026-71889 voms-api-java: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath ord
Bugzilla
CVE-2026-71889 bouncycastle: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
bugzilla·2026-10-14·CVSS 8.7
CVE-2026-71889 [HIGH] CVE-2026-71889 bouncycastle: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
CVE-2026-71889 bouncycastle: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath orde
Bugzilla
CVE-2026-71889 mariadb-java-client: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
bugzilla·2026-10-14·CVSS 8.7
CVE-2026-71889 [HIGH] CVE-2026-71889 mariadb-java-client: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
CVE-2026-71889 mariadb-java-client: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPa
Bugzilla
CVE-2026-71889 fop: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
bugzilla·2026-10-14·CVSS 8.7
CVE-2026-71889 [HIGH] CVE-2026-71889 fop: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
CVE-2026-71889 fop: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath ordering, so
Bugzilla
CVE-2026-71889 canl-java: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
bugzilla·2026-10-14·CVSS 8.7
CVE-2026-71889 [HIGH] CVE-2026-71889 canl-java: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
CVE-2026-71889 canl-java: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath orderin
Bugzilla
CVE-2026-71889 bouncycastle: Bouncy Castle: Certificate validation bypass via missing name constraint checks [epel-all]
bugzilla·2026-10-14·CVSS 8.7
CVE-2026-71889 [HIGH] CVE-2026-71889 bouncycastle: Bouncy Castle: Certificate validation bypass via missing name constraint checks [epel-all]
CVE-2026-71889 bouncycastle: Bouncy Castle: Certificate validation bypass via missing name constraint checks [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath orderi
Bugzilla
CVE-2026-71889 resteasy: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
bugzilla·2026-10-14·CVSS 8.7
CVE-2026-71889 [HIGH] CVE-2026-71889 resteasy: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
CVE-2026-71889 resteasy: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath ordering
Bugzilla
CVE-2026-71889 apache-sshd: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
bugzilla·2026-10-14·CVSS 8.7
CVE-2026-71889 [HIGH] CVE-2026-71889 apache-sshd: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
CVE-2026-71889 apache-sshd: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath order
Bugzilla
CVE-2026-71889 canl-java: Bouncy Castle: Certificate validation bypass via missing name constraint checks [epel-all]
bugzilla·2026-10-14·CVSS 8.7
CVE-2026-71889 [HIGH] CVE-2026-71889 canl-java: Bouncy Castle: Certificate validation bypass via missing name constraint checks [epel-all]
CVE-2026-71889 canl-java: Bouncy Castle: Certificate validation bypass via missing name constraint checks [epel-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath ordering,
Bugzilla
CVE-2026-71889 ceph: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
bugzilla·2026-10-14·CVSS 8.7
CVE-2026-71889 [HIGH] CVE-2026-71889 ceph: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
CVE-2026-71889 ceph: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath ordering, so
Bugzilla
CVE-2026-71889 byte-buddy: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
bugzilla·2026-10-14·CVSS 8.7
CVE-2026-71889 [HIGH] CVE-2026-71889 byte-buddy: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
CVE-2026-71889 byte-buddy: Bouncy Castle: Certificate validation bypass via missing name constraint checks [fedora-all]
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath orderi
Bugzilla
CVE-2026-71889 org.bouncycastle/bcpkix-jdk18on: org.bouncycastle/bcpkix-fips: org.bouncycastle/bcpkix-jdk15on: org.bouncycastle/bcpkix-lts8on: bouncycastle: Bouncy Castle: Certificate validation bypas
bugzilla·2026-10-03·CVSS 8.7
CVE-2026-71889 [HIGH] CVE-2026-71889 org.bouncycastle/bcpkix-jdk18on: org.bouncycastle/bcpkix-fips: org.bouncycastle/bcpkix-jdk15on: org.bouncycastle/bcpkix-lts8on: bouncycastle: Bouncy Castle: Certificate validation bypas
CVE-2026-71889 org.bouncycastle/bcpkix-jdk18on: org.bouncycastle/bcpkix-fips: org.bouncycastle/bcpkix-jdk15on: org.bouncycastle/bcpkix-lts8on: bouncycastle: Bouncy Castle: Certificate validation bypass via missing name constraint checks
In Bouncy Castle for Java before 1.86, neither copy of PKIXCertPathReviewer - org.bouncycastle.pkix.jcajce.PKIXCertPathReviewer nor the legacy org.bouncycastle.x509.PKIXCertPathReviewer - applied X.509 name constraints to the end-entity certificate. checkNameConstraints walked the path with a loop bound of index greater than zero, which is the bound the CA-only steps require, but index zero is the target certificate under the standard CertPath ordering, so the permitted and excluded subtree checks of RFC 5280 sec. 6.1.3 (b) and (c) never ran against the le
2026-10-03
Published