CVE-2026-94300

Concurrent GSS-TSIG messages corrupt memory

At a glance

Severity: HIGH 8.1
EPSS: EPSS 0.95 % · percentile 61 (2026-10-27)
State: PUBLISHED
Published: 2026-10-21
Updated: 2026-10-22
Assigner: isc
NVD status: Awaiting Analysis

Description

Replaying GSS-TSIG signed UDP messages can result in memory corruption in "`named`". An attacker who can capture a previously signed UDP message can replay it while the negotiated TSIG key is still valid. By also sending crafted queries to a zone the attacker controls, the attacker may potentially achieve remote code execution. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.29, 9.21.0 through 9.21.26, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.29-S1.

Scores

Version	Score	Vector	Scored by
CVSS 3.1	HIGH 8.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	isc
CVSS 3.1	HIGH 8.1	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H	NVD · security-officer@isc.org (Secondary)

Weaknesses (CWE)

European references

ENISA EUVD · EUVD-2026-107254
GCVE · GCVE-0-2026-94300

CERT-FR advisories

CERTFR-2026-AVI-1365 — Multiples vulnérabilités dans ISC BIND · cert.ssi.gouv.fr

Affected products

Product	Versions
ISC · BIND 9	affected 9.11.0 ≤ 9.18.50 ; affected 9.20.0 ≤ 9.20.29 ; affected 9.21.0 ≤ 9.21.26 ; affected 9.11.3-S1 ≤ 9.18.50-S1 ; affected 9.20.9-S1 ≤ 9.20.29-S1

References

Sources

Source	Licence
CVE List (CVEProject cvelistV5)	CVE Program Terms of Use
EPSS (FIRST.org)	FIRST — attribution requested
ENISA EUVD	ENISA — reproduction authorised, source acknowledged
CERT-FR (ANSSI)	Licence Ouverte / Etalab 2.0
NVD (NIST) via fkie-cad/nvd-json-data-feeds	Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD