CVE-2026-109428: Mistral Vibe < 2.25.5 Permission Bypass via Bash Line Continuation
Description
Mistral Vibe before 2.25.5 contains a permission validation bypass vulnerability that allows attackers to execute unauthorized commands by exploiting a parsing discrepancy between tree-sitter-bash and bash in handling backslash-newline line continuations in the _extract_commands() function of bash.py. Attackers can craft a command string where tree-sitter-bash extracts only an allowlisted prefix such as cd while bash joins the line continuation into a materially different and hidden command such as a curl request, causing resolve_permission to grant ALWAYS permission while bash executes unauthorized arbitrary commands.
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H · CWE-436
Tracked companies
Mapped from the CVE’s affected-product data, NVD CPE matches, vendor advisories or package feeds. A mapping means the vendor’s software is named, not that its hosted service was exposed.
Status incidents that name it
No tracked status incident names this CVE.
Affected vendors and products
mistralai: mistral-vibe
References
- CVE record on cve.org (opens in new tab)
- NVD entry (opens in new tab)
- github.com/mistralai/mistral-vibe/commit/c069ffa1e12fb5f2487b489217c40ab97721d55… (opens in new tab)
- github.com/mistralai/mistral-vibe/pull/1111 (opens in new tab)
- github.com/mistralai/mistral-vibe/releases/tag/v2.25.5 (opens in new tab)
- www.vulncheck.com/advisories/mistral-vibe-permission-bypass-via-bash-line-continuation (opens in new tab)
- CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (opens in new tab)
- This product uses data from the NVD API but is not endorsed or certified by the NVD. (opens in new tab)
- Known Exploited Vulnerabilities catalog from CISA. (opens in new tab)
- EPSS scores from FIRST (Exploit Prediction Scoring System). (opens in new tab)