CVE-2026-3104highCWE-772

CVE-2026-3104: high-severity vulnerability in ISC BIND 9

Memory leak in code preparing DNSSEC proofs of non-existence

Published · Updated

21Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 7.5epss 1.2%
exploitation probability
1.2%top 33% of all CVEs
observed exploitation
nono source reports it
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Affected products
ISC · BIND 9
Related CVEs — ISC BIND 9

In the same product, most dangerous first.

CVE-2018-5740HIGHA flaw in the "deny-answer-aliases" feature can cause an assertion failure in namedEPSS 59.6%CVE-2022-3736HIGHnamed configured to answer from stale cache may terminate unexpectedly while processing RRSIG queriesEPSS 48.7%CVE-2017-3145HIGHImproper fetch cleanup sequencing in the resolver can cause named to crashEPSS 27.9%CVE-2022-3488HIGHnamed may terminate unexpectedly when processing ECS options in repeated responses to iterative queriesEPSS 19.2%CVE-2024-12705HIGHDNS-over-HTTPS implementation suffers from multiple issues under heavy query loadEPSS 18.4%CVE-2017-3143HIGHAn error in TSIG authentication can permit unauthorized dynamic updatesEPSS 18.3%
References
https://access.redhat.com/errata/RHSA-2026:6935https://access.redhat.com/security/cve/CVE-2026-3104https://bugzilla.redhat.com/show_bug.cgi?id=2451310https://downloads.isc.org/isc/bind9/9.20.21https://downloads.isc.org/isc/bind9/9.21.20https://kb.isc.org/docs/cve-2026-3104https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3104.json