Billy: Path traversal vulnerabilities
Key facts
- Attack vector
- Network
- Privileges required
- Low
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- High · High · None
- Fix status
- Partial Red Hat: 2 without a fix
Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| go-git | go-billy | before 5.9.0 | 5.9.0 | Patch available | CNA |
| — | github.com/go-git/go-billy/v5 (Go) | before 5.9.0 | 5.9.0 | Patch available | GHSA-qw64-3x98-g7q2 |
| — | github.com/go-git/go-billy/v6 (Go) | before 6.0.0-alpha.1 | 6.0.0-alpha.1 | Patch available | GHSA-qw64-3x98-g7q2 |
- go-billy Vendorgo-git Affected before 5.9.0 Fixed in 5.9.0 Patch available CNA
- github.com/go-git/go-billy/v5 (Go) Vendor— Affected before 5.9.0 Fixed in 5.9.0 Patch available GHSA-qw64-3x98-g7q2
- github.com/go-git/go-billy/v6 (Go) Vendor— Affected before 6.0.0-alpha.1 Fixed in 6.0.0-alpha.1 Patch available GHSA-qw64-3x98-g7q2
Remediation
- Fix · CNA go-billy (go-git) Fixed in 5.9.0
- Fix · GHSA-qw64-3x98-g7q2 github.com/go-git/go-billy/v5 (Go) Fixed in 5.9.0 Advisory →
- Fix · GHSA-qw64-3x98-g7q2 github.com/go-git/go-billy/v6 (Go) Fixed in 6.0.0-alpha.1 Advisory →
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Multicluster Engine for Kubernetes | Affected | No fix planned: Will not fix |
| Red Hat Advanced Cluster Management for Kubernetes 2 | Affected | No fix yet |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-44973
- 2026-10-03 Alias added: GHSA-qw64-3x98-g7q2
References
More go-git vulnerabilities
- TI-2023-27070 Maliciously crafted Git server replies can lead to path traversal and RCE on go-git clients CVSS 3.1CRITICAL 9.8
- TI-2025-15573 go-git has an Argument Injection via the URL field CVSS 4.0CRITICAL 9.2
- TI-2025-15574 go-git clients vulnerable to DoS via maliciously crafted Git server replies CVSS 3.1HIGH 7.5
- TI-2023-27069 Maliciously crafted Git server replies can cause DoS on go-git clients CVSS 3.1HIGH 7.5
- TI-2026-30091 go-git Credential leak via cross-host redirect in smart HTTP transport CVSS 3.1HIGH 7.4
- TI-2026-50128 go-git: Worktree operations may follow symlinks CVSS 3.1HIGH 7.1
Sources
- CVE-2026-44973 · CVE Program
- CVE-2026-44973 · NVD
- FIRST EPSS
- GHSA-qw64-3x98-g7q2 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-44973 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences