CVE-2025-40908
CRITICALCVSS 9.1/10EPSS 0.37%
Last modified
CVE-2025-40908 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. YAML-LibYAML prior to 0.903.0 for Perl uses 2-args open, allowing existing files to be modified. EPSS estimates a 0.37% chance of exploitation in the next 30 days.
Description
YAML-LibYAML prior to 0.903.0 for Perl uses 2-args open, allowing existing files to be modified
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Ingydotnet | Yaml-Libyaml | < 0.903.0 |
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
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2025-40908?
YAML-LibYAML prior to 0.903.0 for Perl uses 2-args open, allowing existing files to be modified
How severe is CVE-2025-40908?
CVE-2025-40908 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 0.37% probability of exploitation in the next 30 days.
How do I fix CVE-2025-40908?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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Are you affected by CVE-2025-40908?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST