Vulnerability · Published Oct 22, 2026 · Assigned by GitHub_M
CVE-2026-114605dnspython dns.name.from_wire_parser() excessive CPU use
High 7.5
In plain English
A high-severity security flaw in dnspython from rthalley. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 40% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| AlmaLinux:8 | python3-dns | 1.15.0-13.el8_10 | ALSA-2026:94749 |
| Debian:12 | dnspython | no fix listed | DEBIAN-CVE-2026-114605 |
| Debian:13 | dnspython | no fix listed | DEBIAN-CVE-2026-114605 |
| Debian:14 | dnspython | 2.8.0-7 | DEBIAN-CVE-2026-114605 |
| PyPI | dnspython | 2.9.0 | GHSA-45c3-73f7-pv4m |
| Rocky Linux:8 | python-dns | 0:1.15.0-13.el8_10 | RLSA-2026:94749 |
| Ubuntu:22.04:LTS | dnspython | no fix listed | UBUNTU-CVE-2026-114605 |
| Ubuntu:24.04:LTS | dnspython | no fix listed | UBUNTU-CVE-2026-114605 |
| Ubuntu:26.04:LTS | dnspython | no fix listed | UBUNTU-CVE-2026-114605 |
| Ubuntu:26.10 | dnspython | no fix listed | UBUNTU-CVE-2026-114605 |
Affected products (as reported)
Weakness: CWE-674 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H