SB20260522138 - openEuler 20.03 LTS SP4 update for python-twisted

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Main Vulnerability Database SB20260522138

SB20260522138 - openEuler 20.03 LTS SP4 update for python-twisted

Published: May 22, 2026

Security Bulletin ID SB20260522138
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Denial of service

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Inefficient Algorithmic Complexity (CVE-ID: CVE-2026-42304)

CWE-ID: CWE-407 - Inefficient Algorithmic Complexity

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green


The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to inefficient algorithmic complexity in twisted.names.dns.Name.decode when processing crafted TCP DNS packets with deeply chained compression pointers. A remote attacker can send a specially crafted TCP DNS packet to cause a denial of service.

A single malformed packet can block the single-threaded Twisted reactor event loop for several seconds, preventing the server from handling new connections, processing I/O, or responding to existing requests.


Remediation

Install update from vendor's website.

References