mistral.rs before 0.9.5 Tool Call Injection via mistralrs-core Output Parsers
Summary
| CVE | CVE-2026-124028 |
|---|---|
| State | PUBLISHED |
| Assigner | VulnCheck |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-06 20:17:21 UTC |
| Updated | 2026-11-06 20:17:21 UTC |
| 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. |
Risk And Classification
Primary CVSS: v4.0 2.3 LOW from [email protected]
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
EPSS: 0.001890000 probability, percentile 0.085850000 (date 2026-11-07)
Problem Types: CWE-140 | CWE-140 Improper Neutralization of Delimiters
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 4.0 | [email protected] | Secondary | 2.3 | LOW | 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/C... |
| 4.0 | CNA | CVSS | 2.3 | LOW | 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 |
| 3.1 | [email protected] | Primary | 4.2 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N |
| 3.1 | CNA | CVSS | 4.2 | MEDIUM | CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N |
CVSS v4.0 Breakdown
Attack Vector
NetworkAttack Complexity
HighAttack Requirements
PresentPrivileges Required
NoneUser Interaction
PassiveConfidentiality
LowIntegrity
LowAvailability
NoneSub Conf.
NoneSub Integrity
NoneSub Availability
NoneCVSS: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
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
HighPrivileges Required
NoneUser Interaction
RequiredScope
UnchangedConfidentiality
LowIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | EricLBuehler | Mistral.rs | affected 0.9.5 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| github.com/EricLBuehler/mistral.rs | [email protected] | github.com | |
| www.vulncheck.com/advisories/mistral-rs-before-0.9.5-tool-call-injection-via-mi... | [email protected] | www.vulncheck.com | |
| github.com/EricLBuehler/mistral.rs/commit/b43d3443e946752c0f662c2df42a29... | [email protected] | github.com | |
| github.com/EricLBuehler/mistral.rs/security/advisories/GHSA-34w8-j94f-8c5w | [email protected] | github.com | |
| github.com/EricLBuehler/mistral.rs/pull/2455 | [email protected] | github.com | |
| github.com/EricLBuehler/mistral.rs/releases/tag/v0.9.5 | [email protected] | github.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: Taehun Kim (en)
CNA: Youngjoo Shin (en)
CNA: Eric Buehler (en)
There are currently no legacy QID mappings associated with this CVE.