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CVE-2026-13204— Unexpected exit in certain situations with NSEC and NSEC3 both present

Quick assessment

Affected
ISC BIND 9
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ISC BIND 9是ISC组织的域名系统服务器。 ISC BIND 9 9.11.0版本至9.18.50版本、9.20.0版本至9.20.24版本、9.21.0版本至9.21.23版本、9.11.3-S1版本至9.18.50-S1版本、9.20.9-S1版本至9.20.24-S1版本存在异常处理不当漏洞，该漏洞源于在验证NSEC和NSEC3记录覆盖的不安全域时，存在断言失败，可能导致意外退出。

CVSS 7.5 · High EPSS 0.52% · P42

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 5

VendorProduct Version RangeStatus
ISC BIND 9 9.11.0≤ 9.18.50 affected
9.20.0≤ 9.20.24 affected
9.21.0≤ 9.21.23 affected
9.11.3-S1≤ 9.18.50-S1 affected
9.20.9-S1≤ 9.20.24-S1 affected
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I. Basic Information for CVE-2026-13204

Vulnerability Information
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Vulnerability Title
Unexpected exit in certain situations with NSEC and NSEC3 both present
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5
Vulnerability Title
ISC BIND 9 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ISC BIND 9是ISC组织的域名系统服务器。 ISC BIND 9 9.11.0版本至9.18.50版本、9.20.0版本至9.20.24版本、9.21.0版本至9.21.23版本、9.11.3-S1版本至9.18.50-S1版本、9.20.9-S1版本至9.20.24-S1版本存在异常处理不当漏洞，该漏洞源于在验证NSEC和NSEC3记录覆盖的不安全域时，存在断言失败，可能导致意外退出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
ISC BIND 9 9.11.0 ~ 9.18.50 -

II. Public POCs for CVE-2026-13204

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III. Intelligence Information for CVE-2026-13204

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Vendor Advisories for CVE-2026-13204 (2)

Vendor Pages for CVE-2026-13204 (1)

Same Patch Batch · ISC · 2026-07-22 · 9 CVEs total

CVE-2026-13321 8.6 HIGH DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field
CVE-2026-11605 7.5 HIGH Unnecessary validation of DNSSEC signed records
CVE-2026-11331 7.5 HIGH Potential wildcard CNAME RPZ policy bypass
CVE-2026-11622 7.5 HIGH Potential memory usage beyond configured limits
CVE-2026-11721 7.5 HIGH Cache poisoning possible with label count discrepancy, RRSIG, and wildcards
CVE-2026-12617 7.5 HIGH Record ordering based unexpected exit with CNAME or DNAME
CVE-2026-10723 6.8 MEDIUM Incorrect acceptance of NSEC3 records
CVE-2026-10822 6.5 MEDIUM Key Record using PRIVATEDNS algorithm may lead to unexpected exit

IV. Related Vulnerabilities

Same product: BIND 9
Same vendor: ISC
Same weakness: CWE-617

V. Comments for CVE-2026-13204

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