What’s Vulnerable › Vulnerabilities

CVE-2026-44740: go-billy: Lack of depth and cycle detection in symlink resolution may lead to infinite loops and resource exhaustion

• Severity: medium (CVSS 6.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-01 · updated 2026-07-22
• Weakness: CWE-674

Description

Billy is an interface filesystem abstraction for Go. Prior to versions 5.9.0 and 6.0.0-alpha.1, multiple components may improperly handle crafted or malformed input, resulting in panics, infinite loops, uncontrolled recursion, or excessive resource consumption. These issues arise from insufficient validation and missing safety mechanisms such as cycle detection, recursion limits, or defensive handling of unexpected states when processing untrusted repository data and filesystem structures. This issue has been patched in versions 5.9.0 and 6.0.0-alpha.1.

Affected products

• go-git go-billy: before 5.9.0; before 6.0.0-alpha.1

References

• 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/go-git/go-billy/security/advisories/GHSA-m3xc-h892-ggx6

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