GHSA-gm2x-2g9h-ccm8

Dashboard / Vulnerabilities / GHSA-gm2x-2g9h-ccm8

GHSA-gm2x-2g9h-ccm8

Summary: go-git missing validation decoding Index v4 files leads to panic

Details: ### Impact `go-git`’s index decoder for format version 4 fails to validate the path name prefix length before applying it to the previously decoded path name. A maliciously crafted index file can trigger an out-of-bounds slice operation, resulting in a runtime panic during normal index parsing. This issue only affects Git index format version 4. Earlier formats (`go-git` supports only `v2` and `v3`) are not vulnerable to this issue. An attacker able to supply a crafted `.git/index` file can cause applications using go-git to panic while reading the index. If the application does not recover from panics, this results in process termination, leading to a denial-of-service (DoS) condition. Exploitation requires the ability to modify or inject a Git index file within the local repository in disk. This typically implies write access to the `.git` directory. ### Patches Users should upgrade to `v5.17.1`, or the latest `v6` [pseudo-version](https://go.dev/ref/mod#pseudo-versions), in order to mitigate this vulnerability. ### Credit go-git maintainers thank @kq5y for finding and reporting this issue privately to the `go-git` project.

References: https://github.com/go-git/go-git/security/advisories/GHSA-gm2x-2g9h-ccm8, https://nvd.nist.gov/vuln/detail/CVE-2026-33762, https://github.com/go-git/go-git/commit/e9b65df44cb97faeba148b47523a362beaecddf9, https://github.com/go-git/go-git, https://github.com/go-git/go-git/releases/tag/v5.17.1