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Critical Vulnerability in Perl XS::Parse::Keyword Module Affects Ubuntu Systems

Critical Vulnerability in Perl XS::Parse::Keyword Module Affects Ubuntu Systems

First seen 21 Oct 2026, 19:41 UTC • •
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ThreatCluster AI
ThreatCluster •October 21, 2026 at 20:37 UTC
  • •Critical vulnerability in Perl XS::Parse::Keyword module affects Ubuntu systems.
  • •Denial of service can occur from specially crafted input.
  • •Users must update to patched versions to mitigate risks.

A critical vulnerability has been identified in the Perl XS::Parse::Keyword module, which can lead to denial of service if exploited with specially crafted input. This flaw affects users of the libxs-parse-keyword-perl package on Ubuntu systems, specifically versions 26.10 and 26.04 LTS. Attackers could potentially crash the module, impacting any user or automated system that processes the malicious input. The vulnerability has been assigned the identifier USN-8940-1. Users are advised to update their systems to the patched versions: 0.49-1ubuntu1 for Ubuntu 26.10 and 0.49-1ubuntu0.1 for Ubuntu 26.04 LTS. A standard system update will apply the necessary changes. This vulnerability was disclosed on October 20, 2026, and the advisory was published on October 21, 2026.

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Timeline

2026-10-20
Vulnerability disclosed
The vulnerability in the Perl XS::Parse::Keyword module was publicly disclosed, detailing its impact on Ubuntu systems.
Ubuntu
2026-10-21
Advisory published
Linuxsecurity published an advisory regarding the critical flaws in the Perl XS::Parse::Keyword module, urging users to update.
Linuxsecurity

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Common questions

Which Ubuntu versions are affected?
The affected versions are Ubuntu 26.10 and 26.04 LTS.
What is the nature of the vulnerability?
The vulnerability can lead to denial of service by crashing the Perl XS::Parse::Keyword module with specially crafted input.
How can I protect my systems?
Update your system to the patched versions: 0.49-1ubuntu1 for Ubuntu 26.10 and 0.49-1ubuntu0.1 for Ubuntu 26.04 LTS.