libgit2 — security advisory
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.
- Products
- libgit2
- Affected versions
- 1.5.1+ds-1, 1.5.1+ds-1+deb12u1, 1.9.0+ds-2, 1.9.1+ds-1, 1.9.2+ds-1, 1.9.2+ds-2, 1.9.2+ds-3, 1.9.2+ds-4, 1.9.2+ds-5, 1.9.2+ds-6, 1.9.2+ds-7, 1.9.2+ds-8, 1.9.2+ds-9, 1.9.3+ds-1, 1.9.4+ds-1, 1.9.6+ds-1
- Fixed versions
- 1.5.1+ds-1+deb12u2, 1.9.0+ds-2+deb13u1, 1.9.7+ds-1
- CVEs
- CVE-2026-5917
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 30 Oct 2026, 06:39 UTC · Revision 1
Source evidence
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.
osv:DEBIAN-CVE-2026-5917
libgit2
Fixed versions: 1.5.1+ds-1+deb12u2
libgit2
Fixed versions: 1.9.0+ds-2+deb13u1
libgit2
Fixed versions: 1.9.7+ds-1
Complete source record
{
"id": "bac451c6f38d481f49a36de10155658bde2a3ecf030604a668f56aae1194b3fe",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-5917",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-5917",
"summary": "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.",
"evidence": "osv:DEBIAN-CVE-2026-5917",
"products": [
{
"name": {
"value": "libgit2",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.5.1+ds-1+deb12u2",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": [
{
"value": "1.5.1+ds-1",
"evidence": "/affected/0/versions"
},
{
"value": "1.5.1+ds-1+deb12u1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "libgit2",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
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"evidence": "/affected/1/ranges"
}
],
"affected_versions": [
{
"value": "1.9.0+ds-2",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "libgit2",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "1.9.7+ds-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "1.9.0+ds-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.9.1+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.9.2+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.9.2+ds-2",
"evidence": "/affected/2/versions"
},
{
"value": "1.9.2+ds-3",
"evidence": "/affected/2/versions"
},
{
"value": "1.9.2+ds-4",
"evidence": "/affected/2/versions"
},
{
"value": "1.9.2+ds-5",
"evidence": "/affected/2/versions"
},
{
"value": "1.9.2+ds-6",
"evidence": "/affected/2/versions"
},
{
"value": "1.9.2+ds-7",
"evidence": "/affected/2/versions"
},
{
"value": "1.9.2+ds-8",
"evidence": "/affected/2/versions"
},
{
"value": "1.9.2+ds-9",
"evidence": "/affected/2/versions"
},
{
"value": "1.9.3+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.9.4+ds-1",
"evidence": "/affected/2/versions"
},
{
"value": "1.9.6+ds-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-5917",
"aliases": [
"DEBIAN-CVE-2026-5917"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.5.1+ds-1+deb12u2"
}
]
}
],
"package": {
"name": "libgit2",
"purl": "pkg:deb/debian/libgit2?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"1.5.1+ds-1",
"1.5.1+ds-1+deb12u1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5917.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.9.0+ds-2+deb13u1"
}
]
}
],
"package": {
"name": "libgit2",
"purl": "pkg:deb/debian/libgit2?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"1.9.0+ds-2"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5917.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "1.9.7+ds-1"
}
]
}
],
"package": {
"name": "libgit2",
"purl": "pkg:deb/debian/libgit2?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"1.9.0+ds-2",
"1.9.1+ds-1",
"1.9.2+ds-1",
"1.9.2+ds-2",
"1.9.2+ds-3",
"1.9.2+ds-4",
"1.9.2+ds-5",
"1.9.2+ds-6",
"1.9.2+ds-7",
"1.9.2+ds-8",
"1.9.2+ds-9",
"1.9.3+ds-1",
"1.9.4+ds-1",
"1.9.6+ds-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-5917.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-12T17:00:08.757328055Z",
"provider": "osv",
"upstream": [
"CVE-2026-5917"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-5917"
]
},
"related_cves": [
{
"value": "CVE-2026-5917",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 300061,
"published_at": "2026-08-11T22:17:37.39+00:00"
}