VulnerabilityAnalyzed
CVE-2025-40908
YAML-LibYAML prior to 0.903.0 for Perl uses 2-args open, allowing existing files to be modified
CRITICAL 9.1EPSS 0.45%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.45%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
YAML-LibYAML prior to 0.903.0 for Perl uses 2-args open, allowing existing files to be modified
- CVSS 3.1
- 9.1 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
- EPSS
- 0.45% probability · 39th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-552
- Affected
- ingydotnet/yaml-libyaml
- Source
- 9b29abf9-4ab0-4765-b253-1875cd9b441e
EPSS 0.5% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/ingydotnet/yaml-libyaml-pm/issues/120Exploit, Issue Tracking
- https://github.com/ingydotnet/yaml-libyaml-pm/pull/121Issue Tracking, Patch
- https://github.com/ingydotnet/yaml-libyaml-pm/pull/122Issue Tracking, Patch
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.