High [CVE-2026-13204] Unexpected exit with NSEC and NSEC3 both present
This high-severity Red Hat Linux advisory covers CVE-2026-13204 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7 Extended Lifecycle Support, Red Hat Enterprise Linux 8.
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Summary
If a provably insecure domain is covered by both an NSEC and NSEC3 record at the parent, and there exist an RRSIG for only one of these types, then BIND may exit unexpectedly with an assertion while validating this proof. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-617.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 7 Extended Lifecycle Support; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions; Red Hat Enterprise Linux 9.6 Extended Update Support; Red Hat OpenShift Container Platform 4.22; Red Hat Hardened Images; Red Hat Enterprise Linux 6.
Red Hat lists Red Hat Enterprise Linux 9 as not affected. Red Hat fixing advisory: RHSA-2026:55437, RHSA-2026:60383, RHSA-2026:54509, RHSA-2026:54654, RHSA-2026:54510, RHSA-2026:55442, RHSA-2026:57189, RHSA-2026:55441, RHSA-2026:57362, RHSA-2026:54071.
Affected products named by the advisory: Red Hat package: bind9.16; Red Hat package: bind9.18.
- 9.11.0
- 9.18.50
- 9.20.0
- 9.20.24
- 9.21.0
- 9.21.23
- 9.11.3
- 9.20.9
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
- bind-32:9.18.33-15.el10_2.10
- bind-32:9.11.4-26.P2.el7_9.21
- bind9.16-32:9.16.23-0.22.el8_10.12
- bind-32:9.11.36-16.el8_10.14
- bind-32:9.16.23-40.el9_8.8
- bind9.18-32:9.18.29-14.el9_8.8
- bind-32:9.16.23-18.el9_4.12
- bind-32:9.16.23-31.el9_6.4
- rhcos-4.22.9.8.202608191915-0
- bind-main-9.20.26-0.1.hum1
- RHSA-2026:55437
- RHSA-2026:60383
- RHSA-2026:54509
- RHSA-2026:54654
- RHSA-2026:54510
- RHSA-2026:55442
- RHSA-2026:57189
- RHSA-2026:55441
- RHSA-2026:57362
- RHSA-2026:54071
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
Mitigation
Upgrade to a fixed release: bind-32:9.18.33-15.el10_2.10, bind-32:9.11.4-26.P2.el7_9.21, bind9.16-32:9.16.23-0.22.el8_10.12, bind-32:9.11.36-16.el8_10.14, bind-32:9.16.23-40.el9_8.8, bind9.18-32:9.18.29-14.el9_8.8. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 9 days ago·verify at source
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