CVE-2026-80274: CWE-617 Reachable Assertion in ISC BIND 9
CVE-2026-80274 is a high-severity vulnerability in ISC BIND 9 DNS software that causes the program to exit unexpectedly when a resolver receives a specific sequence of DNSSEC-signed responses involving wildcard answers and NSEC/NSEC3 proofs. This affects multiple BIND 9 versions from 9.11.0 through 9.21.25 and their S1 variants. The vulnerability results in denial of service due to an assertion failure.
AI Analysis
Technical Summary
The vulnerability arises when a BIND resolver queries a DNSSEC-signed authoritative zone and receives a valid wildcard answer with a signed NSEC3 proof, followed by an unsigned NSEC record at the same owner name. This sequence triggers a reachable assertion failure in the code, causing the program to exit unexpectedly. The affected versions include 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, and their corresponding S1 variants. The CVSS v3.1 base score is 7.5, indicating high severity, with an impact on availability (denial of service) but no confidentiality or integrity impact.
Potential Impact
Successful exploitation causes the BIND resolver to terminate unexpectedly, resulting in denial of service. There is no impact on confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor ISC advisories for updates and consider workarounds or mitigations if available.
CVE-2026-80274: CWE-617 Reachable Assertion in ISC BIND 9
Description
CVE-2026-80274 is a high-severity vulnerability in ISC BIND 9 DNS software that causes the program to exit unexpectedly when a resolver receives a specific sequence of DNSSEC-signed responses involving wildcard answers and NSEC/NSEC3 proofs. This affects multiple BIND 9 versions from 9.11.0 through 9.21.25 and their S1 variants. The vulnerability results in denial of service due to an assertion failure.
CVSS v3.1
Score 7.5high
Affected software
ISC
BIND 9
pkg:github/isc/bind9Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability arises when a BIND resolver queries a DNSSEC-signed authoritative zone and receives a valid wildcard answer with a signed NSEC3 proof, followed by an unsigned NSEC record at the same owner name. This sequence triggers a reachable assertion failure in the code, causing the program to exit unexpectedly. The affected versions include 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, and their corresponding S1 variants. The CVSS v3.1 base score is 7.5, indicating high severity, with an impact on availability (denial of service) but no confidentiality or integrity impact.
Potential Impact
Successful exploitation causes the BIND resolver to terminate unexpectedly, resulting in denial of service. There is no impact on confidentiality or integrity. No known exploits are reported in the wild at this time.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor ISC advisories for updates and consider workarounds or mitigations if available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- isc
- Date Reserved
- 2026-08-26T07:08:07.730Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6aaaa87255bf5e2cf5bb988d
Added to database: 09/16/2026, 14:32:18 UTC
Last enriched: 09/16/2026, 14:46:36 UTC
Last updated: 09/16/2026, 14:46:44 UTC
Views: 5
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