Denial of Service Vulnerability in SGLang Affected by Image Processing Flaws
CVE-2026-109229

8.7HIGH

Key Information:

Vendor

Sgl-project

Status
Sglang
Vendor
CVE Published:
12 October 2026

What is CVE-2026-109229?

SGLang versions up to 0.5.21 are susceptible to a denial of service vulnerability, which can be exploited by remote attackers. By manipulating the Image.MAX_IMAGE_PIXELS setting within the NanoNemotronVLImageProcessor, attackers can bypass the Pillow library's decompression bomb protection. This allows them to submit carefully crafted small yet highly compressed images with excessive dimensions, causing a significant memory exhaustion issue during the image decoding process. As a result, the application may become unresponsive, impacting its availability.

Affected Version(s)

sglang 0 <= 0.5.21

References

https://github.com/sgl-project/sglang/issues/43707
issue-tracking
https://github.com/sgl-project/sglang/blob/v0.5.21/python...
technical-description
https://github.com/sgl-project/sglang/blob/v0.5.21/python...
technical-description

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Jiapeng Li
Jiajia Liu
Jiadai Wang
.