CVE-2026-124028
Medium
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.
SeverityMedium
CVSS4.2
Exploit probability—
ProductEriclbuehler Mistral.rs
PublishedNov 6, 2026
First seenNov 6, 2026
Weakness typeCWE-140CWE-140
How to fix
Update
- EricLBuehler mistral.rs0.9.5 or later
Patches
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| EricLBuehler mistral.rs | v < 0.9.5 | 0.9.5 |
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