CVE catalog

CVE-2025-40776

bind9: CVE-2025-40776

Severity: High · CVSS 8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N
Published: Jul 16, 2025, 1:41:01 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.23% · Oct 25, 2026

A `named` caching resolver that is configured to send ECS (EDNS Client Subnet) options may be vulnerable to a cache-poisoning attack. This issue affects BIND 9 versions 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.37-S1, and 9.20.9-S1 through 9.20.10-S1.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	bind9	sid	`1:9.20.30-1`	not affected
Debian	bind9	forky	`1:9.20.30-1`	not affected
Debian	bind9	trixie	`1:9.20.26-1~deb13u1`	not affected
Debian	bind9	trixie-security	`1:9.20.30-1~deb13u1`	not affected
Debian	bind9	bookworm	`1:9.18.49-1~deb12u1`	not affected
Debian	bind9	bookworm-security	`1:9.18.49-1~deb12u3`	not affected
Alpine	bind	3.22	`9.20.11-r0`	fixed
Alpine	bind	3.23	`9.20.11-r0`	fixed
Alpine	bind	3.24	`9.20.11-r0`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	bind9	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	bind9	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	bind9	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	bind9	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Alpine	bind	apk	3.22	`9.20.11-r0`	Not reported	ALPINE-CVE-2025-40776	Not reported
Alpine	bind	apk	3.23	`9.20.11-r0`	Not reported	ALPINE-CVE-2025-40776	Not reported
Alpine	bind	apk	3.24	`9.20.11-r0`	Not reported	ALPINE-CVE-2025-40776	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[bind9]Not affected
Details (6)
- 1:9.18.49-1~deb12u1 · amd64 · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · arm64 · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · amd64 · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · arm64 · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
[bind9-dev]Not affected
Source package: [bind9]
Details (6)
- 1:9.18.49-1~deb12u1 · amd64 · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · arm64 · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · amd64 · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · arm64 · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
[bind9-dnsutils]Not affected
Source package: [bind9]
Details (6)
- 1:9.18.49-1~deb12u1 · amd64 · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · arm64 · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · amd64 · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · arm64 · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
[bind9-doc]Not affected
Source package: [bind9]
Details (6)
- 1:9.18.49-1~deb12u1 · all · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · all · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · all · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · all · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
[bind9-host]Not affected
Source package: [bind9]
Details (6)
- 1:9.18.49-1~deb12u1 · amd64 · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · arm64 · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · amd64 · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · arm64 · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
[bind9-libs]Not affected
Source package: [bind9]
Details (6)
- 1:9.18.49-1~deb12u1 · amd64 · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · arm64 · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · amd64 · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · arm64 · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
[bind9-utils]Not affected
Source package: [bind9]
Details (6)
- 1:9.18.49-1~deb12u1 · amd64 · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · arm64 · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · amd64 · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.20.23-1~deb13u1~bpo12+1 · arm64 · bookworm-backports
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · amd64 · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · arm64 · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
[bind9utils]Not affected
Source package: [bind9]
Details (4)
- 1:9.18.49-1~deb12u1 · all · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · all · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
[dnsutils]Not affected
Source package: [bind9]
Details (4)
- 1:9.18.49-1~deb12u1 · all · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u1 · all · bookworm
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm
- 1:9.18.49-1~deb12u2 · all · bookworm-security
  Not affected
  dsa · bind9 · debian · bookworm

Observed: Oct 27, 2026, 12:54:21 PM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]