CVE-2026-93840CWE-129

CVE-2026-93840

Low · published September 19, 2026

CVSS v3.1
3.7
EPSS
0%
Percentile
14.9
In the wild
Unconfirmed
What it is

vLLM before 0.29.0 validates allowed_token_ids against tokenizer length instead of model output logits width in SamplingParams._validate_allowed_token_ids(). Attackers can supply token IDs above the output vocabulary that pass validation, causing LogitBiasState to corrupt GPU logits state and allow concurrent requests to sample tokens outside their allowlists.

The record
Technical detail
CVSS v3.1
3.7 · LOW
Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
CVSS v4.0
6.3 · CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
EPSS
0.00246 · 14.9th percentile
Weakness
CWE-129 · Improper Validation of Array Index
Published
2026-09-19T00:17Z
Affected products (1)
ProductVersionsFixed in
vllm/vllm< 0.29.00.29.0
References (6)
https://github.com/vllm-project/vllm · [email protected]https://github.com/vllm-project/vllm/blob/v0.28.0/vllm/sampling_params.py#L881-L903 · [email protected]https://github.com/vllm-project/vllm/blob/v0.28.0/vllm/v1/worker/gpu/sample/logit_bias.py#L179-L191 · [email protected]https://github.com/vllm-project/vllm/commit/5b0e5b69ac1a3884a6479c9537789c95263cc804 · [email protected]https://github.com/vllm-project/vllm/pull/49080 · [email protected]https://www.vulncheck.com/advisories/vllm-before-0.29.0-cross-request-logits-corruption-via-allowed-token-ids · [email protected]
EPSS history
Timeline
  • 20 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 18 SEP 19:06Z
    vLLM before 0.29.0 Cross-Request Logits Corruption via allowed_token_ids
    cvelistv5