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Advisories

SGLang through 0.5.21 KV Cache Poisoning via mm_hashes in /generate

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Severity
medium
Date
Affecting

  • sglang >= 0.5.13, <= 0.5.21

CWE
  • CWE-345 Insufficient Verification of Data Authenticity
CVSS
6.3
CVSS V4 Vector
CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N
Credit
Mingkai Yu, Jiadai Wang, Jiajia Liu
Description
SGLang through 0.5.21 trusts caller-supplied mm_hashes values as the multimodal prefix-cache key, allowing remote attackers to poison cached KV entries across requests. Attackers can send a different image under a known or predicted hash via /generate to disclose another request's image content or corrupt victims' responses.

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