dnspython dns.name.from_wire_parser() excessive CPU use

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-114605
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-22 17:16:58 UTC
Updated2026-10-22 17:40:46 UTC
Descriptiondnspython is a DNS toolkit for Python. Prior to 2.9.0, dns.name.from_wire_parser follows attacker-controlled DNS compression pointer chains without a hop limit. A malicious DNS wire-format message can force excessive pointer traversal during name decompression, causing high CPU use, application degradation, or denial of service in applications that process untrusted DNS messages. This issue is fixed in version 2.9.0.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from [email protected]

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-674 | CWE-674 CWE-674: Uncontrolled Recursion

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Rthalley Dnspython affected < 2.9.0 Not specified

References

ReferenceSourceLinkTags
github.com/rthalley/dnspython/security/advisories/GHSA-45c3-73f7-pv4m [email protected] github.com
github.com/rthalley/dnspython/commit/b485e460c266540a1a09ca6d8d1d7b685b1... [email protected] github.com
github.com/rthalley/dnspython/releases/tag/v2.9.0 [email protected] github.com
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