VulnerabilityModified
CVE-2026-3104
A specially crafted domain can be used to cause a memory leak in a BIND resolver simply by querying this domain.
HIGH 7.5EPSS 0.70%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.70%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 0.70% probability · 51th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-772, CWE-401
- Affected
- isc/bind
- Source
- security-officer@isc.org
References
- https://downloads.isc.org/isc/bind9/9.20.21Patch
- https://downloads.isc.org/isc/bind9/9.21.20Patch
- https://kb.isc.org/docs/cve-2026-3104Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:6935
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.