# CVE-2026-114605: dnspython dns.name.from_wire_parser() excessive CPU use

Status: published. Published: 2026-10-22. Updated: 2026-11-12.

dnspython 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.

## Remediation

- fix: dnspython (PyPI): OSV reports a fixed version 2.9.0. Check the advisory for supported release branches. (source: OSV GHSA-45c3-73f7-pv4m) — https://github.com/advisories/GHSA-45c3-73f7-pv4m

## Affected products and versions

- rthalley / dnspython: < 2.9.0 (affected). Source: CNA: GitHub_M
-  / dnspython (dnspython): 1.0.0 (affected, PyPI); 1.1.0 (affected, PyPI); 1.10.0 (affected, PyPI); 1.11.0 (affected, PyPI); 1.11.1 (affected, PyPI); 1.12.0 (affected, PyPI); 1.13.0 (affected, PyPI); 1.14.0 (affected, PyPI); 1.15.0 (affected, PyPI); 1.16.0 (affected, PyPI); 1.2.0 (affected, PyPI); 1.3.0 (affected, PyPI); 1.3.1 (affected, PyPI); 1.3.2 (affected, PyPI); 1.3.3 (affected, PyPI); 1.3.4 (affected, PyPI); 1.3.5 (affected, PyPI); 1.4.0 (affected, PyPI); 1.5.0 (affected, PyPI); 1.6.0 (affected, PyPI); 1.7.1 (affected, PyPI); 1.8.0 (affected, PyPI); 1.9.0 (affected, PyPI); 1.9.1 (affected, PyPI); 1.9.2 (affected, PyPI); 1.9.3 (affected, PyPI); 1.9.4 (affected, PyPI); 2.0.0 (affected, PyPI); 2.0.0rc1 (affected, PyPI); 2.0.0rc2 (affected, PyPI); 2.1.0 (affected, PyPI); 2.1.0rc1 (affected, PyPI); 2.2.0 (affected, PyPI); 2.2.0rc1 (affected, PyPI); 2.2.1 (affected, PyPI); 2.3.0 (affected, PyPI); 2.3.0rc1 (affected, PyPI); 2.4.0 (affected, PyPI); 2.4.0rc1 (affected, PyPI); 2.4.1 (affected, PyPI); 2.4.2 (affected, PyPI); 2.5.0 (affected, PyPI); 2.5.0rc1 (affected, PyPI); 2.6.0 (affected, PyPI); 2.6.0rc1 (affected, PyPI); 2.6.1 (affected, PyPI); 2.7.0 (affected, PyPI); 2.7.0rc1 (affected, PyPI); 2.8.0 (affected, PyPI); 2.8.0rc1 (affected, PyPI); Ecosystem version events: introduced 0; fixed 2.9.0. Source: OSV GHSA-45c3-73f7-pv4m

## Severity and prioritization

- CVSS 3.1: 7.5 (high); CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H; source: CNA: GitHub_M

- CISA KEV: No listing in collected sources

- EPSS: 0.47% as of 2026-11-10; percentile 40.62%

- SSVC: exploitation none; automatable yes; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-674

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://github.com/rthalley/dnspython/security/advisories/GHSA-45c3-73f7-pv4m (CNA: GitHub_M; x_refsource_CONFIRM)

- https://github.com/rthalley/dnspython/commit/b485e460c266540a1a09ca6d8d1d7b685b1d3023 (CNA: GitHub_M; x_refsource_MISC)

- https://github.com/rthalley/dnspython/releases/tag/v2.9.0 (CNA: GitHub_M; x_refsource_MISC)

- https://lists.debian.org/debian-lts-announce/2026/11/msg00017.html (ADP: CVE)

- https://github.com/advisories/GHSA-45c3-73f7-pv4m (OSV / GitHub Security Advisories; advisory)

- https://osv.dev/vulnerability/GHSA-45c3-73f7-pv4m (OSV / GitHub Security Advisories; osv)

## Provenance

- CNA: GitHub_M: https://www.cve.org/CVERecord?id=CVE-2026-114605; retrieved 2026-11-12; source updated 2026-11-12

- OSV / GitHub Security Advisories: https://osv.dev/vulnerability/GHSA-45c3-73f7-pv4m; retrieved 2026-11-12; source updated 2026-10-27

- FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2026-114605; retrieved 2026-11-12; source updated Not reported

Revision: aa33a1c0112eaf7f375cfae8f7adda4d8935767e27ea34a95ec91f12121ed9a7

Canonical: https://y2.dev/cve/CVE-2026-114605

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