rootpwn

high · CVSS v3 5.9 · CVSS v4 8.2

CVE-2026-93838

SGLang versions through 0.5.20 contain an unbounded memory allocation vulnerability in handle_staging_req() that fails t…

Description

SGLang versions through 0.5.20 contain an unbounded memory allocation vulnerability in handle_staging_req() that fails to validate chunk_idx from ZMQ STAGING_REQ frames in prefill/decode disaggregation deployments. Attackers with access to the decode engine's internal ZMQ rank port can send a frame with an extremely large chunk_idx value, causing the scheduler to allocate memory until the system runs out and terminates the process.

Scores

Severity
high
CVSS v2
5.4
CVSS v3
5.9
CVSS v4
8.2
EPSS

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