mistral.rs before 0.9.5 contains a delimiter injection vulnerability in mistralrs-core that allows attackers to inject
Affects mistral.rsSource GCVE Database
Not known to be exploited · CVSS 2.3 Low : upgrade to 0.9.5 when convenient.
Data as of 6 Nov 2026, 22:42 UTC
Thin evidence
One scorer or none| CNA (VulnCheck) | CVSS 4.0 | 2.3 |
|---|---|---|
| CNA (VulnCheck) | CVSS 3.1 | 4.2 |
- Affects
- mistral.rs before 0.9.5
- Patch
- Available – fixed in 0.9.5
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:L/VA:N/SC:N/SI:N/SA:NExploitation evidence
Disclosed: evidence found.
CVE published 6 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 6 Nov 2026.
What to do
Upgrade github/EricLBuehler/mistral.rs to 0.9.5.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
crates.iogithub/EricLBuehler/mistral.rspkg:cargo/github/EricLBuehler/mistral.rsOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
Upgrade mistral.rs to version 0.9.5 or later, where this delimiter injection vulnerability is fixed. No other mitigation steps are indicated or necessary once the update is applied.
Description
A delimiter injection vulnerability exists in mistral.rs versions before 0.9.5 within the mistralrs-core component. This flaw allows attackers who can control input documents, web pages, or tool outputs to inject tool calls by embedding delimiter strings such as </tool_call>. This causes parsers like qwen-xml, gemma4, or reasoning parsers to execute additional tool calls with attacker-supplied arguments. The vulnerability is fixed in version 0.9.5.
References
- github.com/EricLBuehler/mistral.rs/security/advisories/GHSA-34w8-j94f-8c5w (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-124028 (opens in a new tab)
- github.com/EricLBuehler/mistral.rs/pull/2455 (opens in a new tab)
- github.com/EricLBuehler/mistral.rs/commit/b43d3443e946752c0f662c2df42a2974410c9532 (opens in a new tab)
- github.com/EricLBuehler/mistral.rs (opens in a new tab)
- github.com/EricLBuehler/mistral.rs/releases/tag/v0.9.5 (opens in a new tab)
- vulncheck.com/advisories/mistral-rs-before-0.9.5-tool-call-injection-via-mistralrs-core-output-parsers (opens in a new tab)