Improper input validation in YAML-LibYAML



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-40908
CWE-ID CWE-20
Exploitation vector Network
Public exploit N/A
Vulnerable software
 YAML-LibYAML
Other software / Other software solutions

Vendor TINITA

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU110694

Risk: Medium

CVSSv4.0: 1 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-40908

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to overwrite arbitrary files on the system.

The vulnerability exists due to insufficient validation of user-supplied input in LoadFile method. A remote attacker can pass specially crafted arguments to the affected method and overwrite arbitrary files on the system. 

Mitigation

Install updates from vendor's website.

Vulnerable software versions

YAML-LibYAML: 0.01 - 0.902.0

CPE2.3 External links

https://github.com/ingydotnet/yaml-libyaml-pm/issues/120
https://github.com/ingydotnet/yaml-libyaml-pm/pull/121
https://github.com/ingydotnet/yaml-libyaml-pm/pull/122


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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