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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
Mitigation details
CVE-2026-44973 NameCVE-2026-44973 DescriptionBilly 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…
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, sid | 5.8.0-1 | vulnerable | |
| golang-github-go-git-go-billy-v6 (PTS) | forky, sid | 6~git20260226.45bd095-2 | vulnerable |
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) | (unfixed) | |||
| golang-github-go-git-go-billy-v6 | source | (unstable) | (unfixed) |
Notes
https://github.com/go-git/go-billy/security/advisories/GHSA-qw64-3x98-g7q2
Apply commands
https://github.com/go-git/go-billy/security/advisories/GHSA-qw64-3x98-g7q2OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | affected | |
| debian | forky | affected | |
| debian | sid | affected | |
| debian | trixie | affected | |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | github.com/go-git/go-billy/v5 | <5.9.0 | 5.9.0 |
| Go | github.com/go-git/go-billy/v6 | <6.0.0-alpha.1 | 6.0.0-alpha.1 |
| GO | github.com/go-git/go-billy/v6 | < 6.0.0-alpha.1 | 6.0.0-alpha.1 |
| GO | github.com/go-git/go-billy/v5 | < 5.9.0 | 5.9.0 |
References
- https://github.com/go-git/go-billy/security/advisories/GHSA-qw64-3x98-g7q2
- https://github.com/go-git/go-billy
- https://github.com/go-git/go-billy/releases/tag/v5.9.0
- https://github.com/go-git/go-billy/releases/tag/v6.0.0-alpha.1
- https://github.com/advisories/GHSA-qw64-3x98-g7q2
- https://security-tracker.debian.org/tracker/CVE-2026-44973
CWEs
CWE-22
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.