Use of cache containing sensitive information in vLLM - CVE-2026-105752
Published: November 9, 2026
Vulnerability identifier: #VU162994
CSH Severity: Low
CVSS v4: 2.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-105752
CWE-ID: CWE-524
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows an authenticated remote tenant to determine whether another tenant processed a guessed post-tool history in a shared vLLM deployment.
The vulnerability exists due to dropped cache_salt values during salted GPT-OSS Harmony tool continuations at /v1/responses, exposing continuation prefixes to the shared cache when prefix caching and operator-enabled tools are active. An authenticated remote tenant can submit a reconstructed history without a salt and inspect exact cached-token counts to identify matching victim activity.
Affected software
vLLM
How to mitigate CVE-2026-105752
Install security update from vendor's website.
vLLM - update to 0.30.0