CVE-2026-77692

Unauthenticated remote crash of named via a single DoH SIG(0) request

At a glance

Severity: HIGH 7.5
EPSS: EPSS 6.56 % · percentile 94 (2026-10-27)
State: PUBLISHED
Published: 2026-09-16
Updated: 2026-09-17
Assigner: isc
NVD status: Awaiting Analysis

Description

An attacker can cause `named` to abort by sending a crafted DNS-over-HTTPS request with a cryptographically invalid SIG(0) record, and then closing the transport connection prematurely. This issue affects BIND 9 versions 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, and 9.20.9-S1 through 9.20.27-S1.

Scores

Version	Score	Vector	Scored by
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	NVD · security-officer@isc.org (Secondary)

Weaknesses (CWE)

CWE-476

European references

ENISA EUVD · EUVD-2026-80766
GCVE · GCVE-0-2026-77692

CERT-FR advisories

CERTFR-2026-AVI-1385 — Multiples vulnérabilités dans les produits VMware · cert.ssi.gouv.fr
CERTFR-2026-AVI-1376 — Multiples vulnérabilités dans le noyau Linux d'Ubuntu · cert.ssi.gouv.fr
CERTFR-2026-AVI-1192 — Multiples vulnérabilités dans ISC BIND · cert.ssi.gouv.fr

Affected products

Product	Versions
ISC · BIND 9	affected 9.20.0 ≤ 9.20.27 ; affected 9.21.0 ≤ 9.21.25 ; affected 9.20.9-S1 ≤ 9.20.27-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