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PatchSiren cyber security CVE debrief

CVE-2026-13204 ISC CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-22T15:16:52.080Z and has not been modified since then. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1. BIND may exit unexpectedly with an assertion while validating proof if a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist an RRSIG for only one of these types.

Vendor
ISC
Product
BIND 9
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-22
Original CVE updated
2026-07-22
Advisory published
2026-07-22
Advisory updated
2026-07-22

Who should care

BIND users and administrators should review their configurations and update to a patched version if vulnerable. This includes reviewing the configurations of BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1. Security teams and operators managing DNS infrastructure should prioritize patching.

Technical summary

BIND may exit unexpectedly with an assertion while validating proof if a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist an RRSIG for only one of these types. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1. The vulnerability is related to DNSSEC validation and can cause service disruption.

Defensive priority

High priority due to potential for service disruption and impact on DNS infrastructure.

Recommended defensive actions

  • Review BIND configurations and versions
  • Update to a patched version if vulnerable
  • Monitor for potential exploitation attempts
  • Verify BIND configurations for compliance
  • Perform vulnerability scanning
  • Implement compensating controls
  • Track exceptions and retest remediated assets

Evidence notes

Evidence is limited; further investigation is recommended. The CVE record was published on 2026-07-22T15:16:52.080Z and has not been modified since then. BIND users and administrators should verify their configurations and review potential impacts. Defensive verification tasks are necessary due to limited source detail.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-13204 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-13204

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-13204 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-13204

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.