yaml-libyaml vulnerabilities and fixes

Recent CVEs affecting yaml-libyaml, with upgrade or downgrade steps. 1 tracked.

Also searched as: yaml libyaml.

yaml-libyaml has 1 tracked vulnerability, 1 critical. A fixed release or vendor patch exists for 1. Most recent: 2025-06-01. Highest priority: CVE-2025-40908 (score 52/100).

• CVE-2025-40908 CRITICAL 9.1 UPGRADE YAML-LibYAML prior to 0.903.0 for Perl uses 2-args open, allowing existing files to be modified

FAQ

How do I fix yaml-libyaml vulnerabilities?

Open the CVE for your version, check the affected range, then follow the listed action: upgrade to the fixed release, or downgrade or mitigate if no fix exists yet. Commands for each OS are shown on every CVE page.

Is yaml-libyaml being exploited right now?

None of the tracked yaml-libyaml CVEs are on the CISA Known Exploited Vulnerabilities list at the moment. This is checked every 20 minutes.

Which yaml-libyaml CVE should I patch first?

CVE-2025-40908 currently ranks highest (52/100): YAML-LibYAML prior to 0.903.0 for Perl uses 2-args open, allowing existing files to be modified.

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