Vulnerability · Published Sep 29, 2026 · Assigned by GitHub_M
CVE-2026-102827simple-git: unsafe-operations plugin bypass via git long-option abbreviation (--receive-p/--exe) -> command execution (residual of CVE-2026-28291)
High 8.1
In plain English
A high-severity command injection in git-js from steveukx. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code. Fixed versions are available - upgrade the affected package.
Official description
simple-git, an interface for running git commands in any node.js application, enables applications to execute Git operations from JavaScript. Prior to 4.0.0, the default blockUnsafeOperationsPlugin compares parsed option names with literal dangerous option spellings while Git accepts unambiguous long-option abbreviations. Attacker-influenced push arguments such as abbreviated --receive-pack or --exec forms can therefore bypass detectVulnerableFlags, reach git push against a local or file remote or an attacker-influenced receive-pack target, and cause Git to invoke an attacker-selected command in consumers that expose those arguments. The clone-side abbreviation handling does not protect the push path. This issue is fixed in 4.0.0.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | simple-git | 4.0.0 | GHSA-858h-whjf-mvg5 |
Affected products (as reported)
Weakness: CWE-77, CWE-88 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://github.com/steveukx/git-js/security/advisories/GHSA-858h-whjf-mvg5 x_refsource_CONFIRM
- https://github.com/steveukx/git-js/pull/1193 x_refsource_MISC
- https://github.com/steveukx/git-js/commit/98864c678444d9336357c844efa4fd5a7984c0d7 x_refsource_MISC
- https://github.com/steveukx/git-js/releases/tag/simple-git@4.0.0 x_refsource_MISC