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TI-2026-75388 Aliases CVE-2026-111392GHSA-fgff-m398-2gh5

KV cache poisoning in SGLang through mm_hashes

Priority MEDIUM 61CWE-345Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
High
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
Low · Low · None
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-345.

Summary

SGLang from 0.5.13 through 0.5.21 trusts caller-supplied mm_hashes values as the multimodal prefix-cache key, a flaw classed as CWE-345, Insufficient Verification of Data Authenticity. A remote attacker can send a different image under a known or predicted hash through /generate, so cached KV entries are shared across requests. This can disclose another request's image content or corrupt a victim's responses, and no authentication is needed.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Description from the CNA

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00206 10th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
sgl-projectsglang0.5.13 – 0.5.21—No fix listedCNA
  • sglang Vendorsgl-project Affected 0.5.13 – 0.5.21 Fixed in — No fix listed CNA

Remediation

The sources list no fixed version for SGLang.

Written with Claude Haiku 5.5 from the sources below · 2026-10-28

Timeline

  1. 2026-10-16 Threatist record created from CVE-2026-111392
  2. 2026-10-16 Alias added: GHSA-fgff-m398-2gh5
  3. 2026-10-18 CISA SSVC decision points changed

References

Patch 1

Other 3

  • TI-2026-76247 Denial of service in SGLang expert-distribution recording endpoint CVSS 4.0HIGH 8.7
  • TI-2026-70996 SGLang disables decompression bomb check, enabling denial of service CVSS 4.0HIGH 8.7
  • TI-2026-70994 SGLang Memory Exhaustion DoS via Qwen-VL Video Preprocessing CVSS 4.0HIGH 8.7
  • TI-2026-70993 Decompression amplification in SGLang load_audio exhausts memory CVSS 4.0HIGH 8.7
  • TI-2026-65453 SGLang through 0.5.20 Denial of Service via Duplicate bootstrap_room CVSS 4.0HIGH 8.7
  • TI-2026-75290 Code injection in SGLang debug dumper filter CVSS 4.0CRITICAL 9.2
See all 21 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences