CVE-2026-44973: Go-Git Go-Billy

High severity, CVSS 8.1. EPSS: 0.5% chance of exploitation in the next 30 days.

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.

Affected products

• Go-Git Go-Billy: before 5.9.0 (fixed in 5.9.0)

Published 2026-05-28. Last modified 2026-07-21.