CVE-2026-5917
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Summary
libgit2 versions v0.27.0 through v1.9.0 built with the libssh2 SSH backend (USE_SSH=libssh2) contain a shell command injection vulnerability that allows remote attackers to execute arbitrary commands on an SSH server by supplying a repository path containing unescaped shell metacharacters such as single quotes, semicolons, or pipes. The gen_proto() function in ssh_libssh2.c inserts the repository path directly into a shell command string without escaping special characters before passing it to libssh2_channel_exec(), enabling an attacker to craft a malicious submodule URL in a .gitmodules file that, when processed during a recursive clone, causes the remote server's shell to interpret injected commands under the victim's SSH user account.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| libgit2 | libgit2 | 0.27.0 <= 1.9.0 | affected |
Weaknesses
- CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
References
- https://github.com/libgit2/libgit2
- https://www.vulncheck.com/advisories/libgit2-shell-command-injection-via-ssh-libssh2-backend
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