CVE-2025-40908

9.1 criticalEPSS 0.5%

Critical (9.1) in ingydotnet yaml-libyaml. EPSS 0.5% chance of exploitation in the next 30 days.

YAML-LibYAML prior to 0.903.0 for Perl uses 2-args open, allowing existing files to be modified

Severity

9.1 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 40% of CVEs (scores of 2026-10-31)
CWE: CWE-552
Published: 2025-06-01
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19