CVE-2026-111392
SGLang through 0.5.21 KV Cache Poisoning via mm_hashes in /generate
- State
- Published
- Severity
- 6.3 Medium
- Published
- Oct 16, 2026
- Updated
- Oct 16, 2026
- Reserved
- Oct 15, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.3 Medium | 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 | VulnCheck |
| 3.1 | 4.8 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N | VulnCheck |
Weaknesses
- CWE-345 Insufficient Verification of Data Authenticity
Affected Products
| Product | Versions |
|---|---|
sglangsgl-project |
|
References
- https://github.com/sgl-project/sglang/issues/44641issue-tracking
- https://github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/managers/tokenizer_manager.py#L1183-L1215technical-description
- https://github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/managers/io_struct.py#L205-L215technical-description
- https://github.com/sgl-project/sglang/pull/44653patchissue-tracking
- VulnCheck Advisory: SGLang through 0.5.21 KV Cache Poisoning via mm_hashes in /generatethird-party-advisory
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