CVE-2026-124028 mistral.rs before 0.9.5 Tool Call Injection via mistralrs-core Output Parsers
- Exploited in the wild
- Not known
- Fix
- None listed
What is CVE-2026-124028?
CVE-2026-124028 is a low-severity vulnerability in EricLBuehler mistral.rs, published on 6 Nov 2026.
Official 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.
Weakness: CWE-140
Which versions are affected by CVE-2026-124028?
How do I fix CVE-2026-124028?
No fix has been published for CVE-2026-124028 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-124028 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-124028 exists.
Sources
Also known as GHSA-34w8-j94f-8c5w, GHSA-g3jq-5q72-jc6f.