CVE-2026-3104

Summary

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 Software

Weaknesses

• CWE-772: CWE-772 Missing Release of Resource after Effective Lifetime

Workarounds

No workarounds known.

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: partial

bind: BIND: Denial of Service via specially crafted domain query causing a memory leak

Additional References

• https://access.redhat.com/security/cve/CVE-2026-3104
• https://bugzilla.redhat.com/show_bug.cgi?id=2451310
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-3104.json
• https://access.redhat.com/errata/RHSA-2026:6935

References

• https://kb.isc.org/docs/cve-2026-3104
• https://downloads.isc.org/isc/bind9/9.20.21
• https://downloads.isc.org/isc/bind9/9.21.20

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