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
- —