CVE catalog
CVE-2026-3591
Bind vulnerabilities
- Severity
- Medium · CVSS 5.4
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.37% · Oct 25, 2026
A use-after-return vulnerability exists in the `named` server when handling DNS queries signed with SIG(0). Using a specially-crafted DNS request, an attacker may be able to cause an ACL to improperly (mis)match an IP address. In a default-allow ACL (denying only specific IP addresses), this may lead to unauthorized access. Default-deny ACLs should fail-secure. This issue affects BIND 9 versions 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, and 9.20.9-S1 through 9.20.20-S1. BIND 9 versions 9.18.0 through 9.18.46 and 9.18.11-S1 through 9.18.46-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 |
| Ubuntu | bind9 | noble | 1:9.18.39-0ubuntu0.24.04.3 | fixed |
| Ubuntu | bind9-dev | noble | 1:9.18.39-0ubuntu0.24.04.3 | fixed |
| Ubuntu | bind9-dnsutils | noble | 1:9.18.39-0ubuntu0.24.04.3 | fixed |
| Ubuntu | bind9-doc | noble | 1:9.18.39-0ubuntu0.24.04.3 | fixed |
| Ubuntu | bind9-host | noble | 1:9.18.39-0ubuntu0.24.04.3 | fixed |
| Ubuntu | bind9-libs | noble | 1:9.18.39-0ubuntu0.24.04.3 | fixed |
| Ubuntu | bind9-utils | noble | 1:9.18.39-0ubuntu0.24.04.3 | fixed |
| Ubuntu | bind9utils | noble | 1:9.18.39-0ubuntu0.24.04.3 | fixed |
| Ubuntu | dnsutils | noble | 1:9.18.39-0ubuntu0.24.04.3 | fixed |
| Alpine | bind | 3.22 | 9.20.21-r0 | fixed |
| Alpine | bind | 3.23 | 9.20.21-r0 | fixed |
| Alpine | bind | 3.24 | 9.20.21-r0 | fixed |
| Ubuntu | isc-dhcp | 18.04 | 4.3.5-3ubuntu2 | vulnerable |
| Ubuntu | isc-dhcp | 18.04 | 4.3.5-3ubuntu3 | vulnerable |
| Ubuntu | isc-dhcp | 18.04 | 4.3.5-3ubuntu4 | vulnerable |
| Ubuntu | isc-dhcp | 18.04 | 4.3.5-3ubuntu5 | vulnerable |
| Ubuntu | isc-dhcp | 18.04 | 4.3.5-3ubuntu6 | vulnerable |
| Ubuntu | isc-dhcp | 18.04 | 4.3.5-3ubuntu7 | vulnerable |
| Ubuntu | isc-dhcp | 18.04 | 4.3.5-3ubuntu7.1 | vulnerable |
| Ubuntu | isc-dhcp | 18.04 | 4.3.5-3ubuntu7.2 | vulnerable |
| Ubuntu | isc-dhcp | 18.04 | 4.3.5-3ubuntu7.3 | vulnerable |
| Ubuntu | isc-dhcp | 18.04 | 4.3.5-3ubuntu7.4 | vulnerable |
| Ubuntu | bind9-libs | 20.04 | 1:9.11.16+dfsg-3~build1 | vulnerable |
| Ubuntu | bind9-libs | 20.04 | 1:9.11.16+dfsg-3~ubuntu1 | vulnerable |
| Ubuntu | bind9-libs | 22.04 | 1:9.11.19+dfsg-2.1ubuntu1 | vulnerable |
| Ubuntu | bind9-libs | 22.04 | 1:9.11.19+dfsg-2.1ubuntu2 | vulnerable |
| Ubuntu | bind9-libs | 22.04 | 1:9.11.19+dfsg-2.1ubuntu3 | vulnerable |
| Ubuntu | isc-dhcp | 24.04 | 4.4.3-P1-2ubuntu5 | vulnerable |
| Ubuntu | isc-dhcp | 24.04 | 4.4.3-P1-4ubuntu1 | vulnerable |
| Ubuntu | isc-dhcp | 24.04 | 4.4.3-P1-4ubuntu2 | vulnerable |
| 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 | fixed |
| Ubuntu | isc-dhcp | 25.10 | 4.4.3-P1-4ubuntu2 | vulnerable |
| Ubuntu | isc-dhcp | 26.04 | 4.4.3-P1-4ubuntu2 | vulnerable |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | bind9 | source | sid | 1:9.20.21-1 | not yet assigned | Not reported | Not reported |
| Debian | bind9 | source | forky | 1:9.20.21-1 | not yet assigned | Not reported | Not reported |
| Debian | bind9 | source | trixie | 1:9.20.21-1~deb13u1 | not yet assigned | Not reported | Not reported |
| Debian | bind9 | source | bookworm | Not affected | unimportant | Not reported | Not reported |
| Ubuntu | bind9 | deb | noble | 1:9.18.39-0ubuntu0.24.04.3 | Not reported | Not reported | Not reported |
| Ubuntu | bind9-dev | deb | noble | 1:9.18.39-0ubuntu0.24.04.3 | Not reported | Not reported | Not reported |
| Ubuntu | bind9-dnsutils | deb | noble | 1:9.18.39-0ubuntu0.24.04.3 | Not reported | Not reported | Not reported |
| Ubuntu | bind9-doc | deb | noble | 1:9.18.39-0ubuntu0.24.04.3 | Not reported | Not reported | Not reported |
| Ubuntu | bind9-host | deb | noble | 1:9.18.39-0ubuntu0.24.04.3 | Not reported | Not reported | Not reported |
| Ubuntu | bind9-libs | deb | noble | 1:9.18.39-0ubuntu0.24.04.3 | Not reported | Not reported | Not reported |
| Ubuntu | bind9-utils | deb | noble | 1:9.18.39-0ubuntu0.24.04.3 | Not reported | Not reported | Not reported |
| Ubuntu | bind9utils | deb | noble | 1:9.18.39-0ubuntu0.24.04.3 | Not reported | Not reported | Not reported |
| Ubuntu | dnsutils | deb | noble | 1:9.18.39-0ubuntu0.24.04.3 | Not reported | Not reported | Not reported |
| Alpine | bind | apk | 3.22 | 9.20.21-r0 | Not reported | ALPINE-CVE-2026-3591 | Not reported |
| Alpine | bind | apk | 3.23 | 9.20.21-r0 | Not reported | ALPINE-CVE-2026-3591 | Not reported |
| Alpine | bind | apk | 3.24 | 9.20.21-r0 | Not reported | ALPINE-CVE-2026-3591 | Not reported |
| Ubuntu | bind9 | deb | 25.10 | 1:9.20.11-1ubuntu2.2 | Not reported | UBUNTU-CVE-2026-3591 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [bind9]Not affected
Details (6)
1:9.18.49-1~deb12u1· amd64 · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u1· arm64 · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· amd64 · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· arm64 · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· amd64 · bookworm-securityNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· arm64 · bookworm-securityNot affected
usn · bind9 · debian · bookworm
- [bind9-dev]Not affected
Source package: [bind9]
Details (6)
1:9.18.49-1~deb12u1· amd64 · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u1· arm64 · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· amd64 · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· arm64 · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· amd64 · bookworm-securityNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· arm64 · bookworm-securityNot affected
usn · bind9 · debian · bookworm
- [bind9-dnsutils]Not affected
Source package: [bind9]
Details (6)
1:9.18.49-1~deb12u1· amd64 · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u1· arm64 · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· amd64 · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· arm64 · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· amd64 · bookworm-securityNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· arm64 · bookworm-securityNot affected
usn · bind9 · debian · bookworm
- [bind9-doc]Not affected
Source package: [bind9]
Details (6)
1:9.18.49-1~deb12u1· all · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u1· all · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· all · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· all · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· all · bookworm-securityNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· all · bookworm-securityNot affected
usn · bind9 · debian · bookworm
- [bind9-host]Not affected
Source package: [bind9]
Details (6)
1:9.18.49-1~deb12u1· amd64 · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u1· arm64 · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· amd64 · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· arm64 · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· amd64 · bookworm-securityNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· arm64 · bookworm-securityNot affected
usn · bind9 · debian · bookworm
- [bind9-libs]Not affected
Source package: [bind9]
Details (6)
1:9.18.49-1~deb12u1· amd64 · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u1· arm64 · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· amd64 · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· arm64 · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· amd64 · bookworm-securityNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· arm64 · bookworm-securityNot affected
usn · bind9 · debian · bookworm
- [bind9-utils]Not affected
Source package: [bind9]
Details (6)
1:9.18.49-1~deb12u1· amd64 · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u1· arm64 · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· amd64 · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.20.23-1~deb13u1~bpo12+1· arm64 · bookworm-backportsNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· amd64 · bookworm-securityNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· arm64 · bookworm-securityNot affected
usn · bind9 · debian · bookworm
- [bind9utils]Not affected
Source package: [bind9]
Details (4)
1:9.18.49-1~deb12u1· all · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u1· all · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· all · bookworm-securityNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· all · bookworm-securityNot affected
usn · bind9 · debian · bookworm
- [dnsutils]Not affected
Source package: [bind9]
Details (4)
1:9.18.49-1~deb12u1· all · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u1· all · bookwormNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· all · bookworm-securityNot affected
usn · bind9 · debian · bookworm
1:9.18.49-1~deb12u2· all · bookworm-securityNot affected
usn · bind9 · debian · bookworm
[Debian 13 (Trixie)]
- [bind9]Fixed
Details (6)
1:9.20.23-1~deb13u1· amd64 · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.23-1~deb13u1· arm64 · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· arm64 · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.29-1~deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.30-1~deb13u1· amd64 · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
- [bind9-dev]Fixed
Source package: [bind9]
Details (6)
1:9.20.23-1~deb13u1· amd64 · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.23-1~deb13u1· arm64 · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· arm64 · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.29-1~deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.30-1~deb13u1· amd64 · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
- [bind9-dnsutils]Fixed
Source package: [bind9]
Details (6)
1:9.20.23-1~deb13u1· amd64 · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.23-1~deb13u1· arm64 · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· arm64 · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.29-1~deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.30-1~deb13u1· amd64 · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
- [bind9-doc]Fixed
Source package: [bind9]
Details (6)
1:9.20.23-1~deb13u1· all · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.23-1~deb13u1· all · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· all · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.29-1~deb13u1· all · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.30-1~deb13u1· all · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
- [bind9-host]Fixed
Source package: [bind9]
Details (6)
1:9.20.23-1~deb13u1· amd64 · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.23-1~deb13u1· arm64 · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· arm64 · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.29-1~deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.30-1~deb13u1· amd64 · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
- [bind9-libs]Fixed
Source package: [bind9]
Details (6)
1:9.20.23-1~deb13u1· amd64 · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.23-1~deb13u1· arm64 · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· arm64 · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.29-1~deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.30-1~deb13u1· amd64 · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
- [bind9-utils]Fixed
Source package: [bind9]
Details (6)
1:9.20.23-1~deb13u1· amd64 · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.23-1~deb13u1· arm64 · trixieFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.26-1~deb13u1· arm64 · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.29-1~deb13u1· amd64 · trixie-security · Historical versionFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
1:9.20.30-1~deb13u1· amd64 · trixie-securityFixed · Fixed:
1:9.20.21-1~deb13u1usn · bind9 · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/]
- [https://osv.dev/vulnerability/ALPINE-CVE-2026-3591]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-3591]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-3591]
- [https://security-tracker.debian.org/tracker/CVE-2026-3591]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3591.json]
- [https://ubuntu.com/security/notices/USN-8124-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-0863.json]
[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]