vLLM through 0.29.0 fails to properly validate bad_words token indices against the model's generation output width in SamplingParams.update_from_tokenizer(). Attackers can supply out-of-bounds token indices that corrupt logits memory of concurrent requests, causing different in-flight HTTP requests to return incorrect tokens.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Wed, 23 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-787
References
Metrics threat_severity

None

threat_severity

Low


Tue, 22 Sep 2026 17:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Sun, 20 Sep 2026 04:15:00 +0000

Type Values Removed Values Added
First Time appeared Vllm-project
Vllm-project vllm
Vendors & Products Vllm-project
Vllm-project vllm

Sat, 19 Sep 2026 23:00:00 +0000

Type Values Removed Values Added
Description vLLM through 0.29.0 fails to properly validate bad_words token indices against the model's generation output width in SamplingParams.update_from_tokenizer(). Attackers can supply out-of-bounds token indices that corrupt logits memory of concurrent requests, causing different in-flight HTTP requests to return incorrect tokens.
Title vLLM through 0.29.0 Cross-Request Logits Corruption via bad_words
First Time appeared Vllm
Vllm vllm
Weaknesses CWE-129
CPEs cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*
Vendors & Products Vllm
Vllm vllm
References
Metrics cvssV3_1

{'score': 3.1, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N'}

cvssV4_0

{'score': 2.3, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-22T16:00:44.177Z

Reserved: 2026-09-19T10:55:49.093Z

Link: CVE-2026-93989

cve-icon Vulnrichment

Updated: 2026-09-22T16:00:40.331Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-19T23:17:10.043

Modified: 2026-09-22T20:25:55.870

Link: CVE-2026-93989

cve-icon Redhat

Severity : Low

Publid Date: 2026-09-19T22:58:10Z

Links: CVE-2026-93989 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-23T02:15:17Z

Weaknesses