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CVE-2026-93688

SGLang through 0.5.19 Unbounded Memory Allocation via bootstrap_room

CVSS 4.0 8.7 HIGHCVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-93688

Published

SGLang through 0.5.19 in prefill/decode disaggregation mode with Mooncake KV transfer backend fails to validate bootstrap_room values, allowing unbounded transfer state allocation. Unauthenticated attackers can reach the decode engine's POST /generate endpoint and submit arbitrary bootstrap_room values to exhaust prefill process memory until out-of-memory termination.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-93688

Published

sglang

https://pypi.org/project/sglang

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "sgl-project",
                    "product": "sglang",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:pypi/sglang",
                    "repo": "https://github.com/sgl-project/sglang",
                    "collectionURL": "https://pypi.org/project/sglang",
                    "versions": [
                        {
                            "version": "0",
                            "status": "affected",
                            "versionType": "semver",
                            "lessThanOrEqual": "0.5.19"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON