Information disclosure in Vllm-Project Vllm
CVE-2026-105752
vLLM is an inference and serving engine for large language models. Prior to 0.30.0, Harmony tool continuations submitted through "POST /v1/responses" requests rebuild the next-turn engine input without preserving the cache_salt value, placing the continuation prefix in the global unsalted cache namespace even when the caller enabled salting. On deployments with prefix caching enabled, which is the default, an authenticated tenant who can reconstruct a victim's low-entropy post-tool history can submit the same continuation and use the cached_tokens_per_turn count to determine whether the prefix was previously processed, defeating the intended tenant isolation of salted prefix caching. This issue is fixed in version 0.30.0.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N.
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 < 0.30.0
Weakness classification (CWE)
References
Frequently asked questions
- What is CVE-2026-105752?
- CVE-2026-105752 is a low-severity vulnerability in Vllm-Project Vllm, classified under Information Disclosure. CVSS score: 3.1/10. Published 2026-10-05.
- How severe is CVE-2026-105752?
- Low severity. CVSS v3 base score is 3.1 out of 10.