CVE-2026-105752vLLM: Harmony tool continuations drop `cache_salt` — restoring a cross-tenant prefix-cache membership oracle
Updated under an hour ago ()
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It affects vllm-project vllm and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 3.1 LOW (v3.1, CNA)CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-200, CWE-524
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- GitHub_M
- NVD analysis
- Analyzed
- Record last updated
- Oct 6, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
vllm-project vllm vllm_project:vllm (from the name) | before 0.30.0 | CNA record |
vllm vllm vllm:vllm | before 0.30.0 | NVD |
References
- https://github.com/vllm-project/vllm/security/advisories/GHSA-935w-9g4m-p28px-refsource-confirm, mitigation, vendor-advisory
- https://github.com/vllm-project/vllm/pull/50195x-refsource-misc, issue-tracking, patch
- https://github.com/vllm-project/vllm/pull/51818x-refsource-misc, issue-tracking, patch
- https://github.com/vllm-project/vllm/commit/6a2a2bb02b563b83f946012959fd3927984d072ax-refsource-misc, patch
- https://github.com/vllm-project/vllm/releases/tag/v0.30.0x-refsource-misc, release-notes
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.