CVE-2026-5946

HIGH EPSS 57.3%
Published May 20, 20261mo ago · Modified Jun 17, 20262w ago
7.5 CVSS 3.1
High
Find Similar
Published May 20, 2026 1mo ago
Last Modified Jun 17, 2026 2w ago

Description

Multiple flaws have been identified in `named` related to the handling of DNS messages whose CLASS is not Internet (`IN`) — for example, `CHAOS` or `HESIOD`, or DNS messages that specify meta-classes (`ANY` or `NONE`) in the question section. Specially crafted requests reaching the affected code paths — recursion, dynamic updates (`UPDATE`), zone change notifications (`NOTIFY`), or processing of `IN`-specific record types in non-`IN` data — can cause assertion failures in `named`. 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.

CVSS Details

Base Score
7.5
Exploitability
3.9
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
57.3% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 5

CWE-125 Out-of-bounds Read Memory Safety
CWE-20 Improper Input Validation Validation
CWE-617
CWE-754
CWE-843

Affected Products 4

VendorProductVersionRange
iscbind*≥9.11.0  –  ≤9.16.50
iscbind*≥9.18.0  –  <9.18.49
iscbind*≥9.20.0  –  <9.20.23
iscbind*≥9.21.0  –  <9.21.22

References 4

Remediation