CVE-2026-124028

mistral.rs before 0.9.5 Tool Call Injection via mistralrs-core Output Parsers

Published Nov 6, 2026 CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
Description
mistral.rs before 0.9.5 contains a delimiter injection vulnerability in mistralrs-core that allows attackers to inject tool calls by placing delimiter strings in text the model quotes. Attackers controlling documents, web pages or tool outputs can embed tags like </tool_call> to make qwen-xml, gemma4 or reasoning parsers return extra calls to declared tools with attacker-chosen arguments.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
First Time appeared Ericlbuehler
Ericlbuehler mistral.rs
Vendors & Products Ericlbuehler
Ericlbuehler mistral.rs
Type Values Removed Values Added
Description mistral.rs before 0.9.5 contains a delimiter injection vulnerability in mistralrs-core that allows attackers to inject tool calls by placing delimiter strings in text the model quotes. Attackers controlling documents, web pages or tool outputs can embed tags like </tool_call> to make qwen-xml, gemma4 or reasoning parsers return extra calls to declared tools with attacker-chosen arguments.
Title mistral.rs before 0.9.5 Tool Call Injection via mistralrs-core Output Parsers
Weaknesses CWE-140
References
Metrics cvssV3_1

{'score': 4.2, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N'}

cvssV4_0

{'score': 2.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
VulnCheck
Published
Updated
Nov 9, 2026, 1:16 PM
Reserved
Nov 6, 2026, 6:51 PM
Status
Deferred
Published
Nov 6, 2026, 8:17 PM
Modified
Nov 9, 2026, 2:17 PM