{"id":"CVE-2026-124028","aliases":["EUVD-2026-118436","GHSA-34w8-j94f-8c5w","GHSA-g3jq-5q72-jc6f"],"status":"published","title":"mistral.rs before 0.9.5 Tool Call Injection via mistralrs-core Output Parsers","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 \u003c/tool_call\u003e to make qwen-xml, gemma4 or reasoning parsers return extra calls to declared tools with attacker-chosen arguments.","severity":{"version":"4.0","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","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-12","score":0.00189,"percentile":0.08617,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-140"],"published":"2026-11-06T19:14:45Z","modified":"2026-11-09T13:16:52Z","products":[{"vendor":"ericlbuehler","product":"mistral.rs"}],"references":[{"url":"https://github.com/EricLBuehler/mistral.rs/commit/b43d3443e946752c0f662c2df42a2974410c9532","tags":["patch","fix"]},{"url":"https://github.com/EricLBuehler/mistral.rs","tags":["product","package"]},{"url":"https://github.com/EricLBuehler/mistral.rs/security/advisories/GHSA-34w8-j94f-8c5w","tags":["vendor-advisory","exploit","advisory"]},{"url":"https://github.com/EricLBuehler/mistral.rs/pull/2455","tags":["issue-tracking","patch","fix"]},{"url":"https://github.com/EricLBuehler/mistral.rs/releases/tag/v0.9.5","tags":["release-notes","advisory"]},{"url":"https://www.vulncheck.com/advisories/mistral-rs-before-0.9.5-tool-call-injection-via-mistralrs-core-output-parsers","tags":["third-party-advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-124028","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-g3jq-5q72-jc6f"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/124xxx/CVE-2026-124028.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-124028","title":"mistral.rs before 0.9.5 Tool Call Injection via mistralrs-core Output Parsers","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 \u003c/tool_call\u003e to make qwen-xml, gemma4 or reasoning parsers return extra calls to declared tools with attacker-chosen arguments.","status":"published","published":"2026-11-06T19:14:45.628Z","modified":"2026-11-09T13:16:52.813Z","cvss":[{"version":"4.0","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","level":"low","assessor":"cna"},{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-140"],"updated_at":"2026-11-09T14:33:34.013968Z"}],"euvd":[{"id":"EUVD-2026-118436","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 \u003c/tool_call\u003e to make qwen-xml, gemma4 or reasoning parsers return extra calls to declared tools with attacker-chosen arguments.","status":"published","published":"2026-11-06T19:14:45Z","modified":"2026-11-09T13:16:52Z","cvss":[{"version":"4.0","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","level":"low"}],"updated_at":"2026-11-07T00:07:45.032755Z"}],"ghsa":[{"id":"GHSA-g3jq-5q72-jc6f","title":"mistral.rs before 0.9.5 contains a delimiter injection vulnerability in mistralrs-core that...","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 \u003c/tool_call\u003e to make qwen-xml, gemma4 or reasoning parsers return extra calls to declared tools with attacker-chosen arguments.","status":"published","published":"2026-11-06T21:31:30Z","modified":"2026-11-06T21:31:37Z","cvss":[{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low"},{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-140"],"updated_at":"2026-11-06T21:34:16.869182Z"}],"nvd":[{"id":"CVE-2026-124028","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 \u003c/tool_call\u003e to make qwen-xml, gemma4 or reasoning parsers return extra calls to declared tools with attacker-chosen arguments.","status":"published","published":"2026-11-06T20:17:21.31Z","modified":"2026-11-09T14:17:14.343Z","cvss":[{"version":"4.0","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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"low","assessor":"secondary"},{"version":"3.1","score":4.2,"vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-140"],"updated_at":"2026-11-09T16:14:55.273195Z"}],"osv":[{"id":"CVE-2026-124028","title":"mistral.rs before 0.9.5 Tool Call Injection via mistralrs-core Output Parsers","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 \u003c/tool_call\u003e to make qwen-xml, gemma4 or reasoning parsers return extra calls to declared tools with attacker-chosen arguments.","status":"published","published":"2026-11-06T19:14:45.628Z","modified":"2026-11-11T02:31:14.133631329Z","cvss":[{"version":"4.0","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","level":"low"}],"cwes":["CWE-140"],"updated_at":"2026-11-08T02:57:14.556074Z"}]}}