CVE-2026-109428

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.

CVSS 4.0

8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS 3.1

8.8CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 43% of CVEs (scores of 2026-10-25)

CWE

CWE-436

Published

2026-10-13

Modified

2026-10-13

Record from

the NVD, synced 2026-10-19

References

• https://github.com/mistralai/mistral-vibe/commit/c069ffa1e12fb5f2487b489217c40ab97721d553
• https://github.com/mistralai/mistral-vibe/pull/1111
• https://github.com/mistralai/mistral-vibe/releases/tag/v2.25.5
• https://www.vulncheck.com/advisories/mistral-vibe-permission-bypass-via-bash-line-continuation

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