7.5highHigh
CVE-2026-3104
Isc Bind
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.
Exploitation status
- A vendor advisory or patch reference has been published.
What the metrics mean
- It is reachable over a network, without needing local access.
- For an attacker who can reach it, no special conditions are needed to exploit it.
- To exploit it, no account is needed.
- Beyond that, no action by a user is required.
Scoring
- CVSS
- 7.5 (v3.1)
- Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H- Weakness
- CWE-772
- Assigned by
- security-officer@isc.org
Dates
- Published
- 2026-03-25
- Last modified
- 2026-09-01
- Sources
- NVD
Affected products
- Isc Bind9.20.0 - 9.20.21, 9.21.0 - 9.21.20
As listed in the NVD configuration data. Not a statement about your estate.
References
- https://downloads.isc.org/isc/bind9/9.20.21
- https://downloads.isc.org/isc/bind9/9.21.20
- https://kb.isc.org/docs/cve-2026-3104
- 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