HighVulnerabilityLLM-specific

CVE-2026-109428: Mistral Vibe permission bypass via backslash-newline command parsing

Source: NVD(opens in a new tab)
Identifier: CVE-2026-109428
Published: October 13, 2026
Record updated: October 14, 2026

Known exploitation: Not listed in the CISA Known Exploited Vulnerabilities catalog at the last check.

Summary

Mistral Vibe before 2.25.5 has a permission validation bypass in the _extract_commands() function of bash.py. A parsing mismatch between tree-sitter-bash and bash over backslash-newline line continuations lets an attacker hide a command, such as a curl request, behind an allowlisted prefix like cd, so resolve_permission grants ALWAYS permission and bash runs unauthorized commands.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Details

Scores and exploitation

CVSS score: 8.8(high)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack vector: network
Attack complexity: low
Privileges required: none
User interaction: required
EPSS: Not scored. FIRST had not published an EPSS score for this CVE when it was last checked on October 14, 2026.
Disclosure date: October 13, 2026

Weaknesses and techniques

Weakness (CWE): CWE-436

Affected

Vendors: Mistral

Classification

Attack type: Other
Attack sophistication: Moderate
AI component targeted: Agent
Impact: Confidentiality,
Integrity
Labels: security

How this record was produced

Summaries, mitigations and labels on this page are generated automatically from the source. The linked source is authoritative. The source gives this advisory a description and no title, so the title above is a headline generated from the source text.

Original source: https://nvd.nist.gov/vuln/detail/CVE-2026-109428

First tracked: October 14, 2026 at 02:08 AM ET, from NVD/CVE Database

Classifier: claude-haiku-5-5, prompt v4

Classifier confidence: 90% (self-assessed)

Summary

Mitigation

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