Vulnerability in Ingydotnet Yaml-Libyaml
CVE-2025-40908
YAML-LibYAML prior to 0.903.0 for Perl uses 2-args open, allowing existing files to be modified
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.005 (37.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000
Affected products
- Ingydotnet Yaml-Libyaml
- Tinita Yaml::libyaml — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- 9b29abf9-4ab0-4765-b253-1875cd9b441e (issue-tracking, Exploit, Issue Tracking)
- 9b29abf9-4ab0-4765-b253-1875cd9b441e (Patch, patch, Issue Tracking)
- 9b29abf9-4ab0-4765-b253-1875cd9b441e (Patch, patch, Issue Tracking)
Frequently asked questions
- What is CVE-2025-40908?
- CVE-2025-40908 is a critical-severity vulnerability in Ingydotnet Yaml-Libyaml, classified under Files or Directories Accessible to External Parties. CVSS score: 9.1/10. Published 2025-06-01.
- How severe is CVE-2025-40908?
- Critical severity. CVSS v3 base score is 9.1 out of 10.
- Is CVE-2025-40908 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.