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CVE-2026-5917— libgit2 Shell Command Injection via ssh_libssh2 Backend

Quick assessment

Affected
libgit2 libgit2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libgit2是libgit2组织开源的一个可移植的Git核心开发包。 libgit2 0.27.0版本至1.9.0版本存在命令注入漏洞，该漏洞源于ssh_libssh2.c文件中的gen_proto()函数将仓库路径直接插入shell命令字符串且未转义特殊字符，可能导致远程攻击者通过在.gitmodules文件中构造恶意子模块URL，在递归克隆时于受害者SSH用户账户下执行任意命令。

CVSS 8.8 · High EPSS 1.43% · P72

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 2

VendorProduct Version RangeStatus
libgit2 libgit2 < 1.8.7 affected
1.9.0< 1.9.7 affected
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I. Basic Information for CVE-2026-5917

Vulnerability Information
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Vulnerability Title
libgit2 Shell Command Injection via ssh_libssh2 Backend
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
OS命令中使用的特殊元素转义处理不恰当(OS命令注入)
Source: CVE Program / CVE List V5
Vulnerability Title
libgit2 命令注入漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libgit2是libgit2组织开源的一个可移植的Git核心开发包。 libgit2 0.27.0版本至1.9.0版本存在命令注入漏洞，该漏洞源于ssh_libssh2.c文件中的gen_proto()函数将仓库路径直接插入shell命令字符串且未转义特殊字符，可能导致远程攻击者通过在.gitmodules文件中构造恶意子模块URL，在递归克隆时于受害者SSH用户账户下执行任意命令。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
libgit2 libgit2 0 ~ 1.8.7 -

II. Public POCs for CVE-2026-5917

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III. Intelligence Information for CVE-2026-5917

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Vendor Advisories for CVE-2026-5917 (1)

Vendor Pages for CVE-2026-5917 (1)

Other References for CVE-2026-5917 (1)

IV. Related Vulnerabilities

Same product: libgit2
Same vendor: libgit2
Same weakness: CWE-78

V. Comments for CVE-2026-5917

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