Process crash via unchecked GGUF token IDs
Published Aug 18, 2026 · Updated Aug 18, 2026
Out-of-bounds read in the GGUF tokenizer in Eric Buehler mistral.rs before 0.8.23 allows remote attackers to crash the process via crafted GGUF metadata. The convert_gguf_to_hf_tokenizer path reads eos_token_id and optional bos_token_id and unknown_token_id values from untrusted GGUF metadata and uses them as props.tokens indexes without validating that the IDs are within the vocabulary length. Exploitation requires an application path that loads an attacker-supplied GGUF model with the embedded tokenizer; the verified consequence is a deterministic panic and service interrupt during model load.
Summary
What happened
Out-of-bounds read in the GGUF tokenizer in Eric Buehler mistral.rs before 0.8.23 allows remote attackers to crash the process via crafted GGUF metadata. The convert_gguf_to_hf_tokenizer path reads eos_token_id and optional bos_token_id and unknown_token_id values from untrusted GGUF metadata and uses them as props.tokens indexes without validating that the IDs are within the vocabulary length. Exploitation requires an application path that loads an attacker-supplied GGUF model with the embedded tokenizer; the verified consequence is a deterministic panic and service interrupt during model load.
The record
- CVE
- CVE-2026-75090
- Published
- Aug 18, 2026
- Updated
- Aug 18, 2026
- Vendor
- Eric Buehler
- Product
- mistral.rs
- Classifications
- CWE-125, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Aug 18, 2026CVE publishedPublication date reported by the CVE source.
- Aug 18, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.8.0
- Affected versionversion=0.8.1
- Affected versionversion=0.8.10
- Affected versionversion=0.8.11
- Affected versionversion=0.8.12
- Affected versionversion=0.8.13
- Affected versionversion=0.8.14
- Affected versionversion=0.8.15
- Affected versionversion=0.8.16
- Affected versionversion=0.8.17
- Affected versionversion=0.8.18
- Affected versionversion=0.8.19
- Affected versionversion=0.8.2
- Affected versionversion=0.8.20
- Affected versionversion=0.8.21
- Affected versionversion=0.8.22
- Affected versionversion=0.8.3
- Affected versionversion=0.8.4
- Affected versionversion=0.8.5
- Affected versionversion=0.8.6
- Affected versionversion=0.8.7
- Affected versionversion=0.8.8
- Affected versionversion=0.8.9
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Public exploit references
- GGUF tokenizer out-of-bounds panic proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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