Auth bypass in Vllm-Project Vllm
CVE-2026-105755
vLLM is an inference and serving engine for large language models. Prior to 0.30.0, flash late-interaction scoring at the /score and /rerank endpoints derives each worker's query_key value from the caller-controlled X-Request-Id header. A concurrent request that reuses a victim's identifier can overwrite the cached query embedding so the victim's documents are scored against the attacker's query, and shared use counters can also cause a late-interaction cache-miss error. This issue is fixed in version 0.30.0.
Vulnerability class: IDOR (Insecure Direct Object Reference)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Vllm-Project Vllm — versions < 030.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-105755?
- CVE-2026-105755 is a medium-severity vulnerability in Vllm-Project Vllm, classified under Authorization Bypass Through User-Controlled Key. CVSS score: 4.2/10. Published 2026-10-05.
- How severe is CVE-2026-105755?
- Medium severity. CVSS v3 base score is 4.2 out of 10.