# CVE-2026-75090: EricLBuehler Mistral.rs GGUF Tokenizer gguf_tokenizer.rs convert_gguf_to_hf_tokenizer out-of-bounds

> Remote attackers can trigger an out-of-bounds read in the GGUF tokenizer via crafted token IDs, potentially causing crashes or information disclosure.

- **Severity:** Medium 5.3 (`CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** A user has to click or open something
- **Fix available:** No
- **Published:** 18 Aug 2026
- **Updated:** 18 Aug 2026
- **Also known as:** GHSA-9x3x-hjpw-2q3f

## What is CVE-2026-75090?

CVE-2026-75090 is a medium-severity memory corruption vulnerability in EricLBuehler Mistral.rs, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

### Official description

A vulnerability was detected in EricLBuehler Mistral.rs up to 0.8.22. Affected by this issue is the function convert_gguf_to_hf_tokenizer of the file mistralrs-core/src/gguf/gguf_tokenizer.rs of the component GGUF Tokenizer. The manipulation of the argument eos_token_id/bos_token_id/unknown_token_id results in out-of-bounds read. The attack can be executed remotely. The exploit is now public and may be used. Upgrading to version 0.8.23 can resolve this issue. The patch is identified as cd5297e2ea5cb27c790bdcf2f3c2f1064a81d55e. Upgrading the affected component is recommended.

Weakness: CWE-125 (Out-of-bounds Read), CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2026-75090?


## How do I fix CVE-2026-75090?

No fix has been published for CVE-2026-75090 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-75090 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-75090 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-75090 and fix it if it is affected.

What it is: CVE-2026-75090 is a medium-severity memory corruption vulnerability in EricLBuehler Mistral.rs, published on 18 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-75090 exists.

Affected product: EricLBuehler Mistral.rs. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-75090/ (Markdown: https://insights.sbomify.com/CVE-2026-75090/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-75090
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-75090
- OSV: https://osv.dev/vulnerability/CVE-2026-75090

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From sbomify Insights: https://insights.sbomify.com/CVE-2026-75090/
Summaries are generated and may contain mistakes; the official description above is the record.