ubuntu-cve-2026-5917
Vulnerability from osv_ubuntu
Published
2026-08-13 00:00
Modified
2026-08-13 00:00
Summary
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.
Severity
9.6 (Critical)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libgit2-0",
"binary_version": "0.19.0-2ubuntu0.4+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "libgit2",
"purl": "pkg:deb/ubuntu/libgit2@0.19.0-2ubuntu0.4+esm2?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.19.0-2",
"0.19.0-2ubuntu0.4",
"0.19.0-2ubuntu0.4+esm1",
"0.19.0-2ubuntu0.4+esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libgit2-24",
"binary_version": "0.24.1-2ubuntu0.2+esm3"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "libgit2",
"purl": "pkg:deb/ubuntu/libgit2@0.24.1-2ubuntu0.2+esm3?arch=source\u0026distro=esm-apps-legacy/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.22.2-2",
"0.23.1-1",
"0.24.1-2",
"0.24.1-2ubuntu0.2",
"0.24.1-2ubuntu0.2+esm1",
"0.24.1-2ubuntu0.2+esm2",
"0.24.1-2ubuntu0.2+esm3"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libgit2-26",
"binary_version": "0.26.0+dfsg.1-1.1ubuntu0.2+esm2"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "libgit2",
"purl": "pkg:deb/ubuntu/libgit2@0.26.0+dfsg.1-1.1ubuntu0.2+esm2?arch=source\u0026distro=esm-apps/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.25.1+really0.24.6-1",
"0.26.0+dfsg.1-1.1",
"0.26.0+dfsg.1-1.1build1",
"0.26.0+dfsg.1-1.1ubuntu0.2",
"0.26.0+dfsg.1-1.1ubuntu0.2+esm1",
"0.26.0+dfsg.1-1.1ubuntu0.2+esm2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libgit2-28",
"binary_version": "0.28.4+dfsg.1-2ubuntu0.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:20.04:LTS",
"name": "libgit2",
"purl": "pkg:deb/ubuntu/libgit2@0.28.4+dfsg.1-2ubuntu0.1+esm1?arch=source\u0026distro=esm-apps/focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"0.27.7+dfsg.1-0.2build1",
"0.28.3+dfsg.1-1",
"0.28.3+dfsg.1-1ubuntu1",
"0.28.4+dfsg.1-2",
"0.28.4+dfsg.1-2ubuntu0.1",
"0.28.4+dfsg.1-2ubuntu0.1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libgit2-1.1",
"binary_version": "1.1.0+dfsg.1-4.1ubuntu0.1+esm1"
},
{
"binary_name": "libgit2-fixtures",
"binary_version": "1.1.0+dfsg.1-4.1ubuntu0.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "libgit2",
"purl": "pkg:deb/ubuntu/libgit2@1.1.0+dfsg.1-4.1ubuntu0.1+esm1?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.1.0+dfsg.1-4",
"1.1.0+dfsg.1-4.1",
"1.1.0+dfsg.1-4.1build1",
"1.1.0+dfsg.1-4.1ubuntu0.1",
"1.1.0+dfsg.1-4.1ubuntu0.1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libgit2-1.7",
"binary_version": "1.7.2+ds-1ubuntu3.1"
},
{
"binary_name": "libgit2-fixtures",
"binary_version": "1.7.2+ds-1ubuntu3.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "libgit2",
"purl": "pkg:deb/ubuntu/libgit2@1.7.2+ds-1ubuntu3.1?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.5.1+ds-1ubuntu1",
"1.7.1+ds-2ubuntu1",
"1.7.2+ds-1ubuntu1",
"1.7.2+ds-1ubuntu2",
"1.7.2+ds-1ubuntu3",
"1.7.2+ds-1ubuntu3.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libgit2-1.9",
"binary_version": "1.9.1+ds-1ubuntu1.1"
},
{
"binary_name": "libgit2-fixtures",
"binary_version": "1.9.1+ds-1ubuntu1.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "libgit2",
"purl": "pkg:deb/ubuntu/libgit2@1.9.1+ds-1ubuntu1.1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.9.0+ds-2ubuntu2",
"1.9.1+ds-1ubuntu1",
"1.9.1+ds-1ubuntu1.1"
]
}
],
"aliases": [],
"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\u0027s shell to interpret injected commands under the victim\u0027s SSH user account.",
"id": "UBUNTU-CVE-2026-5917",
"modified": "2026-08-13T00:00:00Z",
"published": "2026-08-13T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-5917"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-5917"
},
{
"type": "REPORT",
"url": "https://github.com/libgit2/libgit2"
},
{
"type": "REPORT",
"url": "https://www.vulncheck.com/advisories/libgit2-shell-command-injection-via-ssh-libssh2-backend"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
"type": "CVSS_V3"
},
{
"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",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-5917"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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