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TI-2026-70994 Aliases CVE-2026-109227GHSA-6h2g-h3jf-2prp

SGLang Memory Exhaustion DoS via Qwen-VL Video Preprocessing

Priority HIGH 77CWE-770Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
None
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA. Impact type from CWE-770.

Summary

SGLang through 0.5.21 contains an unbounded memory allocation flaw in preprocess_video in qwen_vl.py, where video frames are decoded at full source resolution before max_pixels limits apply. A remote attacker can submit high-resolution videos to /v1/chat/completions on Qwen-VL deployments, and concurrent requests exhaust worker memory, causing denial of service. This is classified as CWE-770, allocation of resources without limits or throttling.

Written with Claude Haiku 5.5 from the sources below · 2026-10-29

Description from the CNA

SGLang through 0.5.21 contains an unbounded memory allocation vulnerability in preprocess_video in qwen_vl.py that decodes frames at full source resolution before applying max_pixels limits. Remote attackers can submit high-resolution videos to /v1/chat/completions on Qwen-VL deployments, and concurrent requests exhaust worker memory causing denial of service.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00505 43rd 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
Yes
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-projectsglangup to 0.5.21—No fix listedCNA
  • sglang Vendorsgl-project Affected up to 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 · 2026-10-29

Timeline

  1. 2026-10-12 Threatist record created from CVE-2026-109227
  2. 2026-10-12 Alias added: GHSA-6h2g-h3jf-2prp
  3. 2026-10-13 Priority changed: MEDIUM → LOW
  4. 2026-10-18 CISA SSVC decision points changed
  5. 2026-10-18 Priority changed: LOW → HIGH

References

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-2026-70993 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
  • TI-2026-76467 Server-side request forgery in SGLang via bootstrap_host and bootstrap_port CVSS 4.0MEDIUM 6.9
See all 21 →

Sources

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