CVE-2026-77119
published 2026-09-16CVE-2026-77119: A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned…
PriorityP433medium5.9CVSS 3.1
AVNACHPRNUINSUCNIHAN
EPSS
0.23%
12.6th percentile
A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answer through.
This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Affected
9 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| isc | bind | — | — |
| isc | bind_9 | 9.11.0 – 9.18.50 | — |
| isc | bind_9 | 9.11.3-S1 – 9.18.50-S1 | — |
| isc | bind_9 | 9.20.0 – 9.20.27 | — |
| isc | bind_9 | 9.20.9-S1 – 9.20.27-S1 | — |
| isc | bind_9 | 9.21.0 – 9.21.25 | — |
| openshift | ose-rhel-coreos-8 | — | — |
| openshift | ose-rhel-coreos-9 | — | — |
| ubuntu | bind9 | — | — |
CVSS provenance
nvdv3.15.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
vendor_ubuntu8.6HIGH
vendor_redhat5.9MEDIUM
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VulDB
ISC BIND up to 9.21.25 input validation (Nessus ID 347969)
vuldb·2026-09-18·CVSS 5.9
CVE-2026-77119 [MEDIUM] ISC BIND up to 9.21.25 input validation (Nessus ID 347969)
A vulnerability has been found in ISC BIND up to 9.18.50/9.18.50-S1/9.20.27/9.20.27-S1/9.21.25 and classified as problematic. The affected element is an unknown function. This manipulation causes improper input validation.
This vulnerability is handled as CVE-2026-77119. The attack can be initiated remotely. There is not any exploit available.
GHSA
A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answer through.
ghsa_unreviewed·2026-09-16
CVE-2026-77119 [MEDIUM] CWE-346 A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answer through.
A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answer through.
This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Ubuntu
Bind vulnerabilities
vendor_ubuntu·2026-10-14·CVSS 8.6
CVE-2026-19033 [HIGH] Bind vulnerabilities
Title: Bind vulnerabilities
Summary: Several security issues were fixed in Bind.
Zuyao Xu and Xiang Li discovered that Bind incorrectly handled certain
malformed DNSKEY records. A remote attacker could possibly use this issue
to cause Bind to consume resources, resulting in a denial of service. This
issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and Ubuntu 18.04
LTS. (CVE-2025-8677)
Yuxiao Wu, Yunyi Zhang, Baojun Liu, and Haixin Duan discovered that Bind
incorrectly accepted certain records from answers. A remote attacker could
possibly use this issue to perform a cache poisoning attack. This issue
only affected Ubuntu 18.04 LTS. (CVE-2025-40778)
Samy Medjahed discovered that Bind incorrectly handled insecure delegation
validation. A remote attacker could possibly use this iss
Red Hat
bind9: bind: BIND 9: DNSSEC bypass via NSEC3 insecure-referral proof
vendor_redhat·2026-09-16·CVSS 5.9
CVE-2026-77119 [MEDIUM] CWE-290 bind9: bind: BIND 9: DNSSEC bypass via NSEC3 insecure-referral proof
bind9: bind: BIND 9: DNSSEC bypass via NSEC3 insecure-referral proof
A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answer through.
This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
A flaw was found in BIND 9. A remote attacker could exploit a vulnerability where a validly signed NSEC3 record from an unrelated DNS zone might be accepted as proof of insecurity. This could downgrade a secure delegation, allowing forged unsigned DNS answers to be accepted by the resolver, potentially leading to DNS spoofing or integrity compromise.
Statement: This vulnerability ha
No detection rules found.
No public exploits indexed.
Bugzilla
CVE-2026-77119 bind: BIND 9: DNSSEC bypass via NSEC3 insecure-referral proof [fedora-all]
bugzilla·2026-09-17·CVSS 5.9
CVE-2026-77119 [MEDIUM] CVE-2026-77119 bind: BIND 9: DNSSEC bypass via NSEC3 insecure-referral proof [fedora-all]
CVE-2026-77119 bind: BIND 9: DNSSEC bypass via NSEC3 insecure-referral proof [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.
A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answer through.
This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Bugzilla
CVE-2026-77119 bind9: bind: BIND 9: DNSSEC bypass via NSEC3 insecure-referral proof
bugzilla·2026-09-16·CVSS 5.9
CVE-2026-77119 [MEDIUM] CVE-2026-77119 bind9: bind: BIND 9: DNSSEC bypass via NSEC3 insecure-referral proof
CVE-2026-77119 bind9: bind: BIND 9: DNSSEC bypass via NSEC3 insecure-referral proof
A validly signed NSEC3 from an unrelated sibling zone may be accepted as an insecurity proof, downgrading a secure delegation and letting a forged unsigned answer through.
This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.
Hackernews
BIND 9 Update Fixes 14 Flaws, Including an Unauthenticated Crash Over DNS-over-HTTPS
blogs_hackernews·2026-09-17·CVSS 5.9
CVE-2026-19662 [MEDIUM] BIND 9 Update Fixes 14 Flaws, Including an Unauthenticated Crash Over DNS-over-HTTPS
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## BIND 9 Update Fixes 14 Flaws, Including an Unauthenticated Crash Over DNS-over-HTTPS
The Internet Systems Consortium (ISC) has released BIND 9.20.29 and 9.21.26 to fix fourteen security flaws it disclosed on 16 September in BIND 9, its open-source DNS server software. One of them affects any BIND server that answers DNS-over-HTTPS (DoH).
A sender with no credentials can crash the server process, named, with a single request that carries an invalid SIG(0) signature, if the sender closes the connection before named finishes checking the signature.
ISC said in its advisories that it is not aware of any of the fourteen being ex
2026-09-16
Published