CVE-2026-5946

Invalid handling of CLASS != IN

En bref

Sévérité: HIGH 7.5
EPSS: EPSS 1.94 % · centile 80 (2026-10-27)
État: PUBLISHED
Publiée: 2026-05-20
Mise à jour: 2026-09-17
Attribuée par: isc
Statut NVD: Modified

Description

Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) — for example, `CHAOS` or `HESIOD`, or DNS messages that specify meta-classes (`ANY` or `NONE`) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates (`UPDATE`), zone change notifications (`NOTIFY`), or processing of `IN`-specific record types in non-`IN` data — can cause assertion failures in `named`. This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

Scores

Version	Score	Vecteur	Évalué par
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	isc
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	redhat-SADP
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · security-officer@isc.org (Secondary)
CVSS 3.1	HIGH 7.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	NVD · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c (Secondary)

Faiblesses (CWE)

Références européennes

ENISA EUVD · EUVD-2026-31107
GCVE · GCVE-0-2026-5946

Avis du CERT-FR

CERTFR-2026-AVI-0986 — Multiples vulnérabilités dans les produits IBM · cert.ssi.gouv.fr
CERTFR-2026-AVI-0626 — Multiples vulnérabilités dans ISC BIND · cert.ssi.gouv.fr

Configurations affectées (CPE NVD)

cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.11.0 ≤ 9.16.50
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.18.0 < 9.18.49
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.20.0 < 9.20.23
cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:* ≥ 9.21.0 < 9.21.22

Produits affectés

Produit	Versions
ISC · BIND 9	affected 9.11.0 ≤ 9.16.50 ; affected 9.18.0 ≤ 9.18.48 ; affected 9.20.0 ≤ 9.20.22 ; affected 9.21.0 ≤ 9.21.21 ; affected 9.11.3-S1 ≤ 9.16.50-S1 ; affected 9.18.11-S1 ≤ 9.18.48-S1

Références

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