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| Package Name | Ecosystem | Vulnerable Versions | First Patched Version |
|---|---|---|---|
| simple-git | npm | <= 3.36.0 | 4.0.0 |
Miggo AIRoot Cause AnalysisThe vulnerability CVE-2026-102827 in simple-git stems from an incomplete security check in the @simple-git/argv-parser package. Specifically, the detectVulnerableFlags function, which is intended to identify and block dangerous git command-line options like --receive-pack and --exec, failed to account for git's ability to interpret unambiguous abbreviations of long options (e.g., --receive-p for --receive-pack, or --exe for --exec).
In the vulnerable version, detectVulnerableFlags used literal-spelling patterns (regular expressions) that required the full option name. When an attacker supplied an abbreviated form of a dangerous option, detectVulnerableFlags would not match it, incorrectly concluding that no vulnerability was present. This allowed the abbreviated option to be passed to the underlying git process, which would then expand it to its full form and execute the associated malicious command.
The remediation implemented in simple-git version 4.0.0 does not directly modify the detectVulnerableFlags function to improve its regex matching for all abbreviations. Instead, it introduces a higher-level mitigation: by default, simple-git now sets the GIT_TEST_DISALLOW_ABBREVIATED_OPTIONS environment variable to true when spawning git child processes. This instructs the git binary itself to reject any abbreviated long options, thereby preventing the command injection. While this effectively closes the attack vector, the detectVulnerableFlags function in the @simple-git/argv-parser package, in its vulnerable state, is the component that failed to correctly process the malicious abbreviated input.
Therefore, detectVulnerableFlags is identified as the vulnerable function because it is the point where the security check was insufficient, allowing the bypass to occur. During an exploitation attempt, this function would be called, fail to identify the abbreviated dangerous option, and return a 'clean' result, leading to the subsequent execution of the malicious command by .
gitdetectVulnerableFlagspackages/argv-parser/src/vulnerabilities/detect-vulnerable-flags.ts