ZeroDay Findings
Sign inSign up

Vulnerabilities

Vulnerability · CVE-2026-5946

Multiple flaws have been identified in related to the handling of DNS messages whose CLASS is not Internet ( ) — for example, or , or DNS messages that specify meta-cl…

Published May 20, 2026 · catalog updated Sep 17, 2026 · the affected product

Check if you run it

No confirmed exploitation is on record for CVE-2026-5946. EPSS is 1.70%. Act only if a listed version of the affected product is installed.

Severity
High7.5
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
1.70%
Remediation
Advisory link
Affected products
cpe isc/bind

Multiple flaws have been identified in related to the handling of DNS messages whose CLASS is not Internet ( ) — for example, or , or DNS messages that specify meta-classes ( or ) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates ( ), zone change notifications ( ), or processing of -specific record types in non- data — can cause assertion failures in . This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.48, 9.20.0 through 9.20.22, 9.21.0 through 9.21.21, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.48-S1, and 9.20.9-S1 through 9.20.22-S1.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • cpe isc/bindversion unspecified

How to fix CVE-2026-5946

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-5946. EPSS is 1.70%. Act only if a listed version of the affected product is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-125: Out-of-bounds Read; CWE-1287; CWE-20: Improper Input Validation. EPSS 1.70%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. May 20, 2026 · NIST NVD

    Detected

    Multiple flaws have been identified in related to the handling of DNS messages whose CLASS is not Internet ( ) — for example, or , or DNS messages that specify meta-classes ( or ) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates ( ), zone change notifications ( ), or processing of -specific record types in non- data — can cause asser

  2. Sep 17, 2026 · NIST NVD

    Updated

    Multiple flaws have been identified in related to the handling of DNS messages whose CLASS is not Internet ( ) — for example, or , or DNS messages that specify meta-classes ( or ) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates ( ), zone change notifications ( ), or processing of -specific record types in non- data — can cause asser

Sources

  • CVE.orgVulnerability recordCVE-2026-5946

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-5946

    30-day exploitation probability 1.7%

    first.org
  • NIST NVDVulnerability recordCVE-2026-5946

    Multiple flaws have been identified in related to the handling of DNS messages whose CLASS is not Internet ( ) — for example, or , or DNS messages that specify meta-classes ( or ) in the question section. Specially crafted requests reaching t

    nvd.nist.gov

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.