CVE-2025-40908

Publication date 1 June 2025

Last updated 9 July 2025

Ubuntu priority

Why this priority?

Cvss 3 Severity Score

Score breakdown

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

Status

Show unmaintained releases

Package	Ubuntu Release	Status
libyaml-libyaml-perl	25.04 plucky	Not affected
	24.10 oracular	Ignored end of life
	24.04 LTS noble	Fixed 0.89+ds-1ubuntu0.24.04.1
	22.04 LTS jammy	Fixed 0.83+ds-1ubuntu0.22.04.1
	20.04 LTS focal	Needs evaluation
	18.04 LTS bionic	Needs evaluation
	16.04 LTS xenial	Needs evaluation

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
libyaml-libyaml-perl	Upstream: 5fe9dae Upstream: https://github.com/ingydotnet/yaml-libyaml-pm/pull/121 Upstream: https://github.com/ingydotnet/yaml-libyaml-pm/pull/122

Severity score breakdown

Parameter	Value
Base score	9.1 · Critical
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

References

Related Ubuntu Security Notices (USN)

USN-7632-1
YAML-LibYAML vulnerability
9 July 2025

Other references