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CVE-2026-93989

vLLM through 0.29.0 Cross-Request Logits Corruption via bad_words

CVSS 4.0 2.3 LOWCVSS 3.1 3.1 LOWCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-93989

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-93989

Published

vllm

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "vllm-project",
                    "product": "vllm",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:pypi/vllm",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThanOrEqual": "0.29.0"
                        }
                    ],
                    "repo": "https://github.com/vllm-project/vllm"
                }

Original source record · Cite this exact observation · Complete original publisher JSON