CVE-2026-102634

SGLang through 0.5.20 Denial of Service via Duplicate bootstrap_room

8.7 HighFix available

SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate bootstrap_room fields in /generate requests with Mooncake KV transfer backend. Unauthenticated attackers can send concurrent requests with identical bootstrap_room values to crash scheduler processes or hang other users' requests until transfer timeout.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

0.58%Unchanged since Sep 30, 2026

What each source reports

CVE List Score used 8.7

SGLang through 0.5.20 Denial of Service via Duplicate bootstrap_room

Record: CVE-2026-102634
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-694
Updated: 2026-11-02

EUVDEUVD-2026-89029 8.7

Record: EUVD-2026-89029
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Updated: 2026-11-02

GitHub AdvisoriesGHSA-mjgp-hgfr-77jq 8.7

SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate...

Record: GHSA-mjgp-hgfr-77jq
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-694
Updated: 2026-11-02

NVD 8.7

Record: CVE-2026-102634
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1: 7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-694
Updated: 2026-11-02

OSV 8.7

SGLang through 0.5.20 Denial of Service via Duplicate bootstrap_room

Record: CVE-2026-102634
CVSS 4.0: 8.7 HighCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Weakness: CWE-694
Updated: 2026-11-02

OSVopenSUSE-SU-2026:11947-1 No score

python313-sglang-0.5.20-2.1 on GA media

These are all security issues fixed in the python313-sglang-0.5.20-2.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2026:11947-1
Updated: 2026-11-02

Affected products

sgl-project sglang

Affected packages

Affected packages
Package	Affected	Fixed
`python-sglang` openSUSE:Tumbleweed	before 0.5.20-2.1	0.5.20-2.1

History

History
Recorded	Changed	Sources
Nov 2, 2026	first indexed	CVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-102634 is a high vulnerability (CVSS 8.7) in Sgl-project Sglang, published September 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.58%, the 47th percentile. Fixed in python-sglang 0.5.20-2.1.

References

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