CVE-2026-44973

Name	CVE-2026-44973
Description	Billy is an interface filesystem abstraction for Go. Prior to 5.9.0, multiple path traversal issues exist across different components of go-billy. Insufficient path sanitization and boundary enforcement may allow crafted paths (e.g., using ..) to escape intended base directories. While go-billy was not originally designed to provide a strong security boundary, some of these issues were inconsistent across some of the built-in implementations. This results in scenarios where applications relying on go-billy for some level of isolation may inadvertently expose access to unintended filesystem locations. This vulnerability is fixed in 5.9.0.
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-github-go-git-go-billy (PTS)	bookworm	5.3.1-3	vulnerable
	trixie	5.5.0-1	vulnerable
	forky	5.9.0-1	fixed
	sid	5.9.1-1	fixed
golang-github-go-git-go-billy-v6 (PTS)	forky	6.0.0~alpha.1-3	fixed
	sid	6.0.0~alpha.2-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
golang-github-go-git-go-billy	source	(unstable)	5.9.0-1
golang-github-go-git-go-billy-v6	source	(unstable)	6.0.0~alpha.1-1

Notes

[trixie] - golang-github-go-git-go-billy <no-dsa> (Minor issue)
[bookworm] - golang-github-go-git-go-billy <postponed> (Limited support, minor issue; path traversal)
https://github.com/go-git/go-billy/security/advisories/GHSA-qw64-3x98-g7q2