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Local Denial of Service Vulnerability in Urwid Affects Ubuntu Systems

Local Denial of Service Vulnerability in Urwid Affects Ubuntu Systems

First seen 14 Sep 2026, 06:41 UTC • •
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ThreatCluster AI
ThreatCluster •September 15, 2026 at 06:22 UTC
  • •Urwid library vulnerability allows local denial of service and arbitrary code execution.
  • •Affected Ubuntu versions include 20.04, 22.04, and 26.04 LTS.
  • •Users should perform a standard system update to apply necessary patches.

A vulnerability in the Urwid library, discovered by Katriel Moses, allows local attackers to exploit a weak pseudorandom number generator (PRNG). This flaw can lead to denial of service or arbitrary code execution on affected systems. The vulnerability impacts multiple Ubuntu LTS versions, including 20.04, 22.04, and 26.04. Users are advised to update their systems to the latest package versions to mitigate the risk. The issue has been documented in Ubuntu Security Notice USN-8751-1. A standard system update is recommended to apply necessary patches. The vulnerability does not have a CVE identifier listed in the articles. No active exploitation has been reported at this time.

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Updated 52d ago How this analysis works

Timeline

2026-09-14
Vulnerability disclosed
Katriel Moses reported a weak PRNG in Urwid, allowing local attackers to exploit the flaw.
Linuxsecurity
2026-09-14
Patch released
Ubuntu released updates for affected Urwid packages across multiple LTS versions.
Ubuntu

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