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	Ignored end of ESM support, was needed

Get expanded security coverage with Ubuntu Pro

Reduce your average CVE exposure time from 98 days to 1 day with expanded CVE patching, ten-years security maintenance and optional support for the full stack of open-source applications. Free for personal use.

Get Ubuntu Pro 30-day free trial

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