{"id":"CVE-2026-5917","summary":"libgit2 v0.27.0-v1.9.0 Shell Command Injection via ssh_libssh2 Backend","details":"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.","modified":"2026-08-16T11:56:56.736511392Z","published":"2026-08-11T21:40:29.078Z","related":["openSUSE-SU-2026:11521-1"],"database_specific":{"cna_assigner":"VulnCheck","cwe_ids":["CWE-78"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5917.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/5xxx/CVE-2026-5917.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-5917"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/libgit2-shell-command-injection-via-ssh-libssh2-backend"},{"type":"PACKAGE","url":"https://github.com/libgit2/libgit2"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/libgit2/libgit2","events":[{"introduced":"6311e886d8b5377c6037cd9937ccf66a71f3361d"},{"fixed":"338e6fb681369ff0537719095e22ce9dc602dbf0"}],"database_specific":{"extracted_events":[{"introduced":"0.27.0"},{"last_affected":"1.9.0"},{"introduced":"v0.27.0"},{"fixed":"v1.9.0"}],"source":["AFFECTED_FIELD","DESCRIPTION"]}}],"versions":["v1.8.2-rc1","v1.8.2","v1.8.1","v1.8.0","v1.7.0","v1.6.3","v1.6.2","v1.6.1","v1.5.0","v1.3.0","v1.4.0","v1.2.0","v1.1.0","v1.0.0","v0.99.0","v0.28.0-rc1","v0.28.0","v0.27.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-5917.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"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"}]}