CVE-2026-110809

sgl-project SGLang Session Cleanup session_controller.py Session.create_req denial of service

State: Published
Severity: 5.3 Medium
Published: Oct 14, 2026
Updated: Oct 15, 2026
Reserved: Oct 14, 2026

Description

A security vulnerability has been detected in sgl-project SGLang up to 0.5.19. Affected by this issue is the function Session.create_req of the file python/sglang/srt/session/session_controller.py of the component Session Cleanup. Such manipulation leads to denial of service. The attack may be performed from remote. The exploit has been disclosed publicly and may be used. The pull request to fix this issue awaits acceptance.

Scores

CVSS	Score	Vector	Source
4.0	5.3 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P	VulDB
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:C	VulDB
3.0	4.3 Medium	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:C	VulDB
2.0	4.0 Medium	AV:N/AC:L/Au:S/C:N/I:N/A:P/E:POC/RL:ND/RC:C	VulDB

Weaknesses

CWE-404 Denial of Service

Affected Products

Product	Versions
SGLangsgl-project	0.5.0Affected 0.5.1Affected 0.5.2Affected 0.5.3Affected 0.5.4Affected 0.5.5Affected 0.5.6Affected 0.5.7Affected 0.5.8Affected 0.5.9Affected 0.5.10Affected 0.5.11Affected 0.5.12Affected 0.5.13Affected 0.5.14Affected 0.5.15Affected 0.5.16Affected 0.5.17Affected 0.5.18Affected 0.5.19Affected

References

VDB-420279 | sgl-project SGLang Session Cleanup session_controller.py Session.create_req denial of servicevdb-entrytechnical-description
VDB-420279 | CTI Indicators (IOB, IOC, TTP, IOA)signaturepermissions-required
CVE-2026-110809 | CVE Analysis and Reportthird-party-advisory
Submit #1004356 | SGLang Project SGLang(SGLang Runtime) 0.5.19 Remote Denial of Servicethird-party-advisory
https://github.com/sgl-project/sglang/issues/41470issue-tracking
https://github.com/sgl-project/sglang/pull/41483issue-trackingpatch
https://gist.github.com/Yunzez/dbd254603fa2bc74358cb3647423d0ec#file-repro_sglang_session_replace_crash-pyexploit
https://github.com/sgl-project/sglang/product

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.