CVE catalog

CVE-2026-3593

Severity: High · CVSS 7.4CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:H
Published: Apr 10, 2026, 6:39:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 1.54% · Oct 27, 2026

A use-after-free vulnerability exists within the DNS-over-HTTPS implementation. This issue affects BIND 9 versions 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, and 9.20.9-S1 through 9.20.22-S1. BIND 9 versions 9.18.0 through 9.18.48 and 9.18.11-S1 through 9.18.48-S1 are NOT affected.

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`	fixed
Debian	bind9	forky	`1:9.20.30-1`	fixed
Debian	bind9	trixie	`1:9.20.26-1~deb13u1`	fixed
Debian	bind9	trixie-security	`1:9.20.30-1~deb13u1`	fixed
Debian	bind9	bookworm	`1:9.18.49-1~deb12u1`	not affected
Debian	bind9	bookworm-security	`1:9.18.49-1~deb12u3`	not affected
Cpe	bind9	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	fixed
Cpe	bind9-dev	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	fixed
Cpe	bind9-dnsutils	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	fixed
Cpe	bind9-doc	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	fixed
Cpe	bind9-host	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	fixed
Cpe	bind9-libs	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	fixed
Cpe	bind9-utils	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	fixed
Cpe	bind9utils	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	fixed
Cpe	dnsutils	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	fixed
Cpe	bind	Not reported	`9.20.23`	fixed
Cpe	bind	Not reported	`9.21.22`	fixed
Cpe	bind	Not reported	`9.21.22`	fixed
Alpine	bind	3.20	`9.18.49-r0`	fixed
Alpine	bind	3.21	`9.18.49-r0`	fixed
Alpine	bind	3.22	`9.20.23-r0`	fixed
Alpine	bind	3.23	`9.20.23-r0`	fixed
Alpine	bind	3.24	`9.20.23-r0`	fixed
Ubuntu	bind9	25.10	`1:9.20.4-3ubuntu1`	vulnerable
Ubuntu	bind9	25.10	`1:9.20.4-3ubuntu2`	vulnerable
Ubuntu	bind9	25.10	`1:9.20.4-3ubuntu3`	vulnerable
Ubuntu	bind9	25.10	`1:9.20.9-2ubuntu1`	vulnerable
Ubuntu	bind9	25.10	`1:9.20.10-1ubuntu1`	vulnerable
Ubuntu	bind9	25.10	`1:9.20.11-1ubuntu1`	vulnerable
Ubuntu	bind9	25.10	`1:9.20.11-1ubuntu2`	vulnerable
Ubuntu	bind9	25.10	`1:9.20.11-1ubuntu2.1`	vulnerable
Ubuntu	bind9	25.10	`1:9.20.11-1ubuntu2.2`	vulnerable
Ubuntu	bind9	25.10	`1:9.20.11-1ubuntu2.4`	fixed
Ubuntu	bind9	26.04	`1:9.20.11-1ubuntu2`	vulnerable
Ubuntu	bind9	26.04	`1:9.20.11-1ubuntu3`	vulnerable
Ubuntu	bind9	26.04	`1:9.20.18-1ubuntu1`	vulnerable
Ubuntu	bind9	26.04	`1:9.20.18-1ubuntu2`	vulnerable
Ubuntu	bind9	26.04	`1:9.20.18-1ubuntu2.1`	fixed
Opensuse	bind	tumbleweed	`9.20.23-2.1`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	bind9	source	sid	`1:9.20.23-1`	not yet assigned	Not reported	Not reported
Debian	bind9	source	forky	`1:9.20.23-1`	not yet assigned	Not reported	Not reported
Debian	bind9	source	trixie	`1:9.20.23-1~deb13u1`	not yet assigned	Not reported	Not reported
Debian	bind9	source	bookworm	`Not affected`	unimportant	Not reported	Not reported
Cpe	bind9	cpe	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	Not reported	Not reported	Not reported
Cpe	bind9-dev	cpe	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	Not reported	Not reported	Not reported
Cpe	bind9-dnsutils	cpe	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	Not reported	Not reported	Not reported
Cpe	bind9-doc	cpe	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	Not reported	Not reported	Not reported
Cpe	bind9-host	cpe	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	Not reported	Not reported	Not reported
Cpe	bind9-libs	cpe	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	Not reported	Not reported	Not reported
Cpe	bind9-utils	cpe	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	Not reported	Not reported	Not reported
Cpe	bind9utils	cpe	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	Not reported	Not reported	Not reported
Cpe	dnsutils	cpe	Not reported	`1:9.18.39-0ubuntu0.24.04.5`	Not reported	Not reported	Not reported
Cpe	bind	cpe	Not reported	`9.20.23`	Not reported	Not reported	Not reported
Cpe	bind	cpe	Not reported	`9.21.22`	Not reported	Not reported	Not reported
Cpe	bind	cpe	Not reported	`9.21.22`	Not reported	NVD-CVE-2026-3593	Not reported
Alpine	bind	apk	3.20	`9.18.49-r0`	Not reported	ALPINE-CVE-2026-3593	Not reported
Alpine	bind	apk	3.21	`9.18.49-r0`	Not reported	ALPINE-CVE-2026-3593	Not reported
Alpine	bind	apk	3.22	`9.20.23-r0`	Not reported	ALPINE-CVE-2026-3593	Not reported
Alpine	bind	apk	3.23	`9.20.23-r0`	Not reported	ALPINE-CVE-2026-3593	Not reported
Alpine	bind	apk	3.24	`9.20.23-r0`	Not reported	ALPINE-CVE-2026-3593	Not reported
Ubuntu	bind9	deb	25.10	`1:9.20.11-1ubuntu2.4`	Not reported	UBUNTU-CVE-2026-3593	Not reported
Ubuntu	bind9	deb	26.04	`1:9.20.18-1ubuntu2.1`	Not reported	UBUNTU-CVE-2026-3593	Not reported
Opensuse	bind	rpm	tumbleweed	`9.20.23-2.1`	Not reported	OPENSUSE-SU-2026:10915-1	Not reported

OpenFactory catalog packages

[openSUSE Tumbleweed]

[bind-doc]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · noarch · tumbleweed
  Unknown · Fixed: 9.20.23-2.1
  Version impact unknown
  nvd · bind · opensuse · tumbleweed
[bind-modules-bdbhpt]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.23-2.1
  Version impact unknown
  nvd · bind · opensuse · tumbleweed
[bind-modules-generic]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.23-2.1
  Version impact unknown
  nvd · bind · opensuse · tumbleweed
[bind-modules-ldap]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.23-2.1
  Version impact unknown
  nvd · bind · opensuse · tumbleweed
[bind-modules-mysql]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.23-2.1
  Version impact unknown
  nvd · bind · opensuse · tumbleweed
[bind-modules-perl]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.23-2.1
  Version impact unknown
  nvd · bind · opensuse · tumbleweed
[bind-modules-sqlite3]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.23-2.1
  Version impact unknown
  nvd · bind · opensuse · tumbleweed
[bind-utils]Unknown
Source package: [bind]
Details (1)
- 9.20.26-1.2 · x86_64 · tumbleweed
  Unknown · Fixed: 9.20.23-2.1
  Version impact unknown
  nvd · bind · opensuse · tumbleweed

[Debian 12 (Bookworm)]

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

[Debian 13 (Trixie)]

[bind9]Fixed
Details (6)
- 1:9.20.23-1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.23-1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.26-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.26-1~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.29-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.30-1~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
[bind9-dev]Fixed
Source package: [bind9]
Details (6)
- 1:9.20.23-1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.23-1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.26-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.26-1~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.29-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.30-1~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
[bind9-dnsutils]Fixed
Source package: [bind9]
Details (6)
- 1:9.20.23-1~deb13u1 · amd64 · trixie
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.23-1~deb13u1 · arm64 · trixie
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.26-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.26-1~deb13u1 · arm64 · trixie-security
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.29-1~deb13u1 · amd64 · trixie-security · Historical version
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13
- 1:9.20.30-1~deb13u1 · amd64 · trixie-security
  Fixed · Fixed: 1:9.20.23-1~deb13u1
  nvd · bind9 · debian · 13

Next results

Observed: Oct 27, 2026, 7:59:12 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]