{"id":"CVE-2026-5917","state":"PUBLISHED","title":"libgit2 Shell Command Injection via ssh_libssh2 Backend","description":"libgit2 versions before 1.8.7 and 1.9.0 before 1.9.7 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.","publishedAt":"2026-08-11T21:40:29.078Z","updatedAt":"2026-10-01T15:20:07.878Z","severity":{"score":8.6,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["libgit2 libgit2"],"affected":[{"vendor":"libgit2","product":"libgit2","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThan":"1.8.7","versionType":"custom"},{"version":"1.9.0","status":"affected","lessThan":"1.9.7","versionType":"semver"}]}],"references":["https://github.com/libgit2/libgit2/security/advisories/GHSA-xqj4-2j5v-rr75","https://www.vulncheck.com/advisories/libgit2-shell-command-injection-via-ssh-libssh2-backend"],"weaknesses":["CWE-78"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/5xxx/CVE-2026-5917.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-5917","state":"PUBLISHED","datePublished":"2026-08-11T21:40:29.078Z","dateUpdated":"2026-10-01T15:20:07.878Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-04-08T20:02:31.343Z"},"containers":{"cna":{"title":"libgit2 Shell Command Injection via ssh_libssh2 Backend","descriptions":[{"lang":"en","value":"libgit2 versions before 1.8.7 and 1.9.0 before 1.9.7 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":[{"vendor":"libgit2","product":"libgit2","defaultStatus":"affected","versions":[{"version":"0","status":"affected","lessThan":"1.8.7","versionType":"custom"},{"version":"1.9.0","status":"affected","lessThan":"1.9.7","versionType":"semver"}]}],"references":[{"url":"https://github.com/libgit2/libgit2/security/advisories/GHSA-xqj4-2j5v-rr75","name":"GitHub Security Advisory (GHSA-xqj4-2j5v-rr75)","tags":["vendor-advisory","patch"]},{"url":"https://www.vulncheck.com/advisories/libgit2-shell-command-injection-via-ssh-libssh2-backend","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","subIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subAvailabilityImpact":"NONE","exploitMaturity":"NOT_DEFINED","Safety":"NOT_DEFINED","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","version":"4.0","baseSeverity":"HIGH","baseScore":8.6,"vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"}},{"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}],"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH","version":"3.1","baseSeverity":"HIGH","baseScore":8.8,"vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-78","lang":"en","description":"Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-01T15:20:07.878Z"},"tags":["x_open-source"],"datePublic":"2026-08-11T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:libgit2:libgit2:*:*:*:*:*:*:*:*","versionEndExcluding":"1.8.7"},{"vulnerable":true,"criteria":"cpe:2.3:a:libgit2:libgit2:*:*:*:*:*:*:*:*","versionStartIncluding":"1.9.0","versionEndExcluding":"1.9.7"}]}]}],"credits":[{"lang":"en","value":"Kazuma Matsumoto, a security researcher at GMO Cybersecurity by IERAE, Inc.","type":"finder"},{"lang":"en","value":"Isabel Mill","type":"finder"}],"source":{"discovery":"UNKNOWN"},"x_generator":{"engine":"vulncheck"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-12T12:48:11.019321Z","id":"CVE-2026-5917","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-12T12:48:30.674Z"}}]}}}