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Vulnerability · Published Mar 25, 2026 · Assigned by isc

CVE-2026-3104Memory leak in code preparing DNSSEC proofs of non-existence

High 7.5

In plain English

A high-severity security flaw in BIND 9 from ISC. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 54% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)7.5High
Exploit odds (30 days)0.7%top 46.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

A specially crafted domain can be used to cause a memory leak in a BIND resolver simply by querying this domain. 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.22bind9.20.21-r0ALPINE-CVE-2026-3104
Alpine:v3.23bind9.20.21-r0ALPINE-CVE-2026-3104
Alpine:v3.24bind9.20.21-r0ALPINE-CVE-2026-3104
Debian:13bind91:9.20.21-1~deb13u1DEBIAN-CVE-2026-3104
Debian:14bind91:9.20.21-1DEBIAN-CVE-2026-3104
Ubuntu:25.10bind91:9.20.11-1ubuntu2.2UBUNTU-CVE-2026-3104
Ubuntu:22.04:LTSbind9-libsno fix listedUBUNTU-CVE-2026-3104
Ubuntu:24.04:LTSisc-dhcpno fix listedUBUNTU-CVE-2026-3104
Ubuntu:25.10isc-dhcpno fix listedUBUNTU-CVE-2026-3104
Ubuntu:26.04:LTSisc-dhcpno fix listedUBUNTU-CVE-2026-3104

Affected products (as reported)

VendorProductVersions
ISC BIND 9 9.20.0 – through 9.20.209.21.0 – through 9.21.199.20.9-S1 – through 9.20.20-S1

Weakness: CWE-772 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References