CVE-2026-28291

Summary

simple-git enables running native Git commands from JavaScript. Versions up to and including 3.31.1 allow execution of arbitrary commands through Git option manipulation, bypassing safety checks meant to block dangerous options like -u and –upload-pack. The flaw stems from an incomplete fix for CVE-2022-25860, as Git's flexible option parsing allows numerous character combinations (e.g., -vu, -4u, -nu) to circumvent the regular-expression-based blocklist in the unsafe operations plugin. Due to the virtually infinite number of valid option variants that Git accepts, a complete blocklist-based mitigation may be infeasible without fully emulating Git's option parsing behavior. This issue has been fixed in version 3.32.0.

Affected Software

Weaknesses

• CWE-78: CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

• https://github.com/steveukx/git-js/security/advisories/GHSA-jcxm-m3jx-f287

simple-git: simple-git: Command Execution via Option-Parsing Bypass in simple-git

Additional References

• https://access.redhat.com/security/cve/CVE-2026-28291
• https://bugzilla.redhat.com/show_bug.cgi?id=2457930
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-28291.json

References

• https://github.com/steveukx/git-js/security/advisories/GHSA-jcxm-m3jx-f287
• https://github.com/steveukx/git-js/commit/1effd8e5012a5da05a9776512fac3e39b11f2d2d
• https://github.com/steveukx/git-js/blob/789c13ebabcf18ebe0b3a0c88ebb4037dede42e3/simple-git/src/lib/plugins/block-unsafe-operations-plugin.ts#L26
• https://github.com/steveukx/git-js/releases/tag/simple-git%403.32.0
• https://www.cve.org/CVERecord?id=CVE-2022-25860

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