CVE-2026-13204
Unexpected exit in certain situations with NSEC and NSEC3 both present
Description
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. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1.
INFO
Published Date :
July 22, 2026, 3:16 p.m.
Last Modified :
July 22, 2026, 3:16 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Update BIND to a patched version.
- Ensure DNSSEC validation is configured correctly.
- Review NSEC and NSEC3 record configurations.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-13204.
| URL | Resource |
|---|---|
| https://downloads.isc.org/isc/bind9/9.20.26 | |
| https://downloads.isc.org/isc/bind9/9.21.24 | |
| https://kb.isc.org/docs/cve-2026-13204 |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-13204 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-13204
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-13204 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-13204 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by [email protected]
Jul. 22, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'ISC', 'product': 'BIND 9', 'versions': [{'status': 'affected', 'version': '9.11.0', 'versionType': 'custom', 'lessThanOrEqual': '9.18.50'}, {'status': 'affected', 'version': '9.20.0', 'versionType': 'custom', 'lessThanOrEqual': '9.20.24'}, {'status': 'affected', 'version': '9.21.0', 'versionType': 'custom', 'lessThanOrEqual': '9.21.23'}, {'status': 'affected', 'version': '9.11.3-S1', 'versionType': 'custom', 'lessThanOrEqual': '9.18.50-S1'}, {'status': 'affected', 'version': '9.20.9-S1', 'versionType': 'custom', 'lessThanOrEqual': '9.20.24-S1'}], 'defaultStatus': 'unaffected'}] Added Description 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. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-617 Added Reference https://downloads.isc.org/isc/bind9/9.20.26 Added Reference https://downloads.isc.org/isc/bind9/9.21.24 Added Reference https://kb.isc.org/docs/cve-2026-13204