What is CVE-2026-12617?

CVE-2026-12617 is a high-severity vulnerability in Isc Bind 9, classified under Reachable Assertion. CVSS score: 7.5/10. Published 2026-07-22.

How severe is CVE-2026-12617?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Isc Bind 9

CVE-2026-12617

The issue is unexpected program termination based on ordering and/or specific content in responses to queries for CNAME or DNAME, and A records. Specifically, if a client queries for a DNAME and A record below the DNAME to the resolver, an…

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Isc Bind 9 — versions 9.18.0, 9.20.0, 9.18.11-S1

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

security-officer@isc.org (vendor-advisory)
security-officer@isc.org (patch)

Frequently asked questions

What is CVE-2026-12617?: CVE-2026-12617 is a high-severity vulnerability in Isc Bind 9, classified under Reachable Assertion. CVSS score: 7.5/10. Published 2026-07-22.
How severe is CVE-2026-12617?: High severity. CVSS v3 base score is 7.5 out of 10.