CVE-2026-12816
published 2026-08-03CVE-2026-12816: In Bouncy Castle for Java before 1.85, IESEngine stream-mode MAC forgery via length-dependent KDF split. This issue also affects Bouncy Castle for Java LTS…
PriorityP341high7.5CVSS 3.1
AVNACLPRNUINSUCNIHAN
EPSS
0.18%
7.1th percentile
In Bouncy Castle for Java before 1.85, IESEngine stream-mode MAC forgery via length-dependent KDF split. This issue also affects Bouncy Castle for Java LTS before 2.73.12.
Affected
28 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| ansible-automation-platform-27 | de-minimal-rhel9 | — | — |
| ansible-automation-platform-27 | de-supported-rhel9 | — | — |
| bouncycastle | bc-java | < 1.85 | 1.85 |
| bouncycastle | bouncy_castle_for_java_lts | <= 2.73.11 | — |
| 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-java | < 1.85 | 1.85 |
| legion_of_the_bouncy_castle_inc | bc-lts-java | >= 2.73.0 < 2.73.12 | 2.73.12 |
| ocp-tools-4 | jenkins-rhel8 | — | — |
| ocp-tools-4 | jenkins-rhel9 | — | — |
| opendaylight | opendaylight | — | — |
| pki-core_10.6 | resteasy | — | — |
| pki-deps_10.6 | resteasy | — | — |
| redhat | resteasy | — | — |
| rhbk | keycloak-rhel9 | — | — |
| rhoai | odh-modelmesh-rhel9 | — | — |
| rhoai | odh-spark-operator-rhel9 | — | — |
| rhoai | odh-th06-cpu-torch210-py312-rhel9 | — | — |
| rhoai | odh-th06-cpu-torch291-py312-rhel9 | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
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_redhat7.5HIGH
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VulDB
Legion of the Bouncy Castle BC-JAVA/BC-LTS-JAVA up to 1.84/2.73.11 signature verification (WID-SEC-2026-2622)
vuldb·2026-09-03·CVSS 7.5
CVE-2026-12816 [HIGH] Legion of the Bouncy Castle BC-JAVA/BC-LTS-JAVA up to 1.84/2.73.11 signature verification (WID-SEC-2026-2622)
A vulnerability classified as problematic has been found in Legion of the Bouncy Castle BC-JAVA and BC-LTS-JAVA up to 1.84/2.73.11. Impacted is an unknown function. This manipulation causes improper verification of cryptographic signature.
The identification of this vulnerability is CVE-2026-12816. It is possible to initiate the attack remotely. There is no exploit available.
It is recommended to upgrade the affected component.
GHSA
In Bouncy Castle for Java before 1.85, IESEngine stream-mode MAC forgery via length-dependent KDF split.
ghsa_unreviewed·2026-08-03
CVE-2026-12816 [HIGH] CWE-354 In Bouncy Castle for Java before 1.85, IESEngine stream-mode MAC forgery via length-dependent KDF split.
In Bouncy Castle for Java before 1.85, IESEngine stream-mode MAC forgery via length-dependent KDF split. This issue also affects Bouncy Castle for Java LTS before 2.73.12.
Red Hat
org.bouncycastle/bcprov-jdk15on: Bouncy Castle for Java: Message Authentication Code (MAC) forgery due to a length-dependent Key Derivation Function (KDF) split
vendor_redhat·2026-08-03·CVSS 7.5
CVE-2026-12816 [HIGH] CWE-1240 org.bouncycastle/bcprov-jdk15on: Bouncy Castle for Java: Message Authentication Code (MAC) forgery due to a length-dependent Key Derivation Function (KDF) split
org.bouncycastle/bcprov-jdk15on: Bouncy Castle for Java: Message Authentication Code (MAC) forgery due to a length-dependent Key Derivation Function (KDF) split
In Bouncy Castle for Java before 1.85, IESEngine stream-mode MAC forgery via length-dependent KDF split. This issue also affects Bouncy Castle for Java LTS before 2.73.12.
A flaw was found in Bouncy Castle for Java. This vulnerability allows for Message Authentication Code (MAC) forgery in the IESEngine stream-mode. The issue arises from a length-dependent Key Derivation Function (KDF) split, which an attacker could exploit to bypass integrity checks. This could lead to unauthorized manipulation of data.
Statement: This is an Important vulnerability. Bouncy Castle for Java is susceptible to Message Authentication Code (MAC) forg
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2025-12816 grafana: node-forge: Interpretation conflict vulnerability allows bypassing cryptographic verifications [fedora-42]
bugzilla·2025-12-11·CVSS 8.6
CVE-2025-12816 [HIGH] CVE-2025-12816 grafana: node-forge: Interpretation conflict vulnerability allows bypassing cryptographic verifications [fedora-42]
CVE-2025-12816 grafana: node-forge: Interpretation conflict vulnerability allows bypassing cryptographic verifications [fedora-42]
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.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-
Bugzilla
CVE-2025-12816 h3: node-forge: Interpretation conflict vulnerability allows bypassing cryptographic verifications [fedora-42]
bugzilla·2025-12-11·CVSS 8.6
CVE-2025-12816 [HIGH] CVE-2025-12816 h3: node-forge: Interpretation conflict vulnerability allows bypassing cryptographic verifications [fedora-42]
CVE-2025-12816 h3: node-forge: Interpretation conflict vulnerability allows bypassing cryptographic verifications [fedora-42]
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.
The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Discussion:
This message is a reminder that Fedora Linux 42 is nearing its end of life.
Fedora will stop maintaining and issuing updates for Fedora Linux 42 on 2026-05-13.
I
2026-08-03
Published