CVE-2026-41082

Publication date 17 April 2026

Last updated 13 May 2026

Ubuntu priority

Why this priority?

Cvss 3 Severity Score

Score breakdown

Description

In OCaml opam before 2.5.1, a .install field containing a destination filepath can use ../ to reach a parent directory.

Read the notes from the security team

Status

Show unmaintained releases

Package	Ubuntu Release	Status
opam	26.04 LTS resolute	Fixed 2.5.0-1ubuntu0.1~esm1
	25.10 questing	Fixed 2.3.0-1+deb13u1build0.25.10.1
	24.04 LTS noble	Fixed 2.1.5-1ubuntu0.1~esm2
	22.04 LTS jammy	Fixed 2.1.2-1+deb12u1build0.22.04.1
	20.04 LTS focal	Fixed 2.0.5-1ubuntu1+esm1
	18.04 LTS bionic	Vulnerable
	16.04 LTS xenial	Vulnerable

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Notes

john-breton

Backports to xenial and bionic will require a significant amount of effort due to the older versions of opam. Upstream has only released a fix targeting 2.5.X.

Patch details

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

Package	Patch details
opam	Upstream: https://github.com/ocaml/opam/pull/6898/changes

Severity score breakdown

Parameter	Value
Base score	7.3 · High
Attack vector	Local
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	Low
Integrity impact	High
Availability impact	Low
Vector	CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:H/A:L

References

Related Ubuntu Security Notices (USN)

USN-8256-1
opam vulnerability
7 May 2026