Description
SGLang through 0.5.22 contains a denial of service vulnerability that allows API clients to abort other users' in-flight generation requests by supplying a short client-controlled rid. Attackers can submit streaming /generate requests with single hex character rids and disconnect, triggering prefix-matching abort logic that terminates all other clients' requests.
Published: 2026-10-19
Score: 8.2 High
EPSS: n/a
KEV: No
Impact: Denial of Service
Action: Immediate Patch
AI Analysis

Impact

The vulnerability in SGLang v0.5.22 allows a client to terminate other users' ongoing generation requests by exploiting rid prefix matching. By sending a streaming /generate request with a single hex character rid and then dropping the connection, an attacker can trigger abort logic that scans for any rid starting with that prefix, thereby aborting all other requests. This results in a denial of service for affected users and disrupts service availability.

Affected Systems

SGLang (sgl-project) through version 0.5.22 is affected. All releases prior to 0.5.23 contain the flaw.

Risk and Exploitability

The CVSS score of 8.2 indicates high severity, while the EPSS score is not available, making it unclear how frequently this flaw is exploited in the wild. It is not listed in the CISA KEV catalog. Attackers can exploit the flaw by sending a crafted /generate request with a minimal rid (e.g., a single hex character) and immediately disconnecting. The abort logic has no authentication check on the rid, so any API client can trigger the denial of service if the endpoint is publicly reachable.

Generated by OpenCVE AI on October 19, 2026 at 15:47 UTC.

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

  • Upgrade SGLang to the latest release (≥0.5.23) to remove the vulnerability.
  • If upgrading is not immediately possible, configure API traffic to reject or block rid values of length one or less, enforcing the use of full rid values for all requests.
  • As a temporary measure, implement network‑level throttling or rate limiting on the /generate endpoint to reduce the impact of abort requests, and monitor for abnormal request patterns.

Generated by OpenCVE AI on October 19, 2026 at 15:47 UTC.

Tracking

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Advisories

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History

Mon, 19 Oct 2026 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Sgl-project
Sgl-project sglang
Vendors & Products Sgl-project
Sgl-project sglang

Mon, 19 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 19 Oct 2026 14:00:00 +0000

Type Values Removed Values Added
Description SGLang through 0.5.22 contains a denial of service vulnerability that allows API clients to abort other users' in-flight generation requests by supplying a short client-controlled rid. Attackers can submit streaming /generate requests with single hex character rids and disconnect, triggering prefix-matching abort logic that terminates all other clients' requests.
Title SGLang through 0.5.22 Cross-Request Abort via rid Prefix Matching
Weaknesses CWE-187
References
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.2, 'vector': 'CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

Sgl-project Sglang
cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-10-19T14:21:40.361Z

Reserved: 2026-10-19T13:25:24.402Z

Link: CVE-2026-112266

cve-icon Vulnrichment

Updated: 2026-10-19T14:21:36.066Z

cve-icon NVD

Status : Deferred

Published: 2026-10-19T14:17:03.987

Modified: 2026-10-19T15:17:05.480

Link: CVE-2026-112266

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-19T19:00:04Z

Weaknesses
  • CWE-187

    Partial String Comparison