CVE-2026-85731

Name	CVE-2026-85731
Description	oras-go is a Go library for managing OCI artifacts. Prior to 2.6.2, content/file.Store extraction of OCI layers marked with io.deis.oras.content.unpack=true can write outside the store working directory. The pushDir path through extractTarDirectory and ensureLinkPath validates symlink targets lexically, resolveRelToBase skips its parent-symlink walk for root-level entries, and writeFile follows a terminal symlink when opening a regular file. A malicious archive can therefore create a symlink chain whose lexical target remains inside the extraction root but whose resolved target is an attacker-selected absolute path, then overwrite that target with a same-named regular-file entry even when AllowPathTraversalOnWrite is false. Pulling an attacker-controlled artifact can create or overwrite any file writable by the process and may lead to code execution. This issue is fixed in version 2.6.2.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
golang-oras-oras-go (PTS)	bookworm	1.1.1-1	vulnerable
	trixie	2.5.0-1	vulnerable
	forky, sid	2.6.2-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
golang-oras-oras-go	source	(unstable)	2.6.2-1

Notes

[trixie] - golang-oras-oras-go <no-dsa> (Minor issue)
[bookworm] - golang-oras-oras-go <postponed> (Limited support, minor issue; v1.1.1 affected too, content/utils.go untar writes through symlink chains)
https://github.com/oras-project/oras-go/security/advisories/GHSA-m37j-52j7-pjw7
Fixed by: https://github.com/oras-project/oras-go/commit/adab2f25ea95ef4e6e41f50db9266a6701399422 (v2.6.2)