What is CVE-2026-3119?

CVE-2026-3119 is a medium-severity vulnerability in Isc Bind, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2026-03-25.

How severe is CVE-2026-3119?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Isc Bind

CVE-2026-3119

Under certain conditions, `named` may crash when processing a correctly signed query containing a TKEY record. The affected code can only be reached if an incoming request has a valid transaction signature (TSIG) from a key declared in the `named` configuration. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-S1 are NOT affected.

Published 2026-03-25 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.006 (46.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 47th percentile — 46.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Isc Bind
Isc Bind 9 — versions 9.20.0, 9.21.0, 9.20.9-S1

Weakness classification (CWE)

CWE-617 — Reachable Assertion

References

kb.isc.org/docs/cve-2026-3119 (vendor-advisory, Vendor Advisory)
downloads.isc.org/isc/bind9/9.20.21 (Patch, patch)
downloads.isc.org/isc/bind9/9.21.20 (Patch, patch)

Frequently asked questions

What is CVE-2026-3119?: CVE-2026-3119 is a medium-severity vulnerability in Isc Bind, classified under Reachable Assertion. CVSS score: 6.5/10. Published 2026-03-25.
How severe is CVE-2026-3119?: Medium severity. CVSS v3 base score is 6.5 out of 10.