GHSA-2wcg-j54r-m6wmHighCVSS 5.9
SGLang versions through 0.5.20 contain an unbounded memory allocation vulnerability in...
🔗 CVE IDs covered (1)
📋 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.
🔗 References (8)
- https://nvd.nist.gov/vuln/detail/CVE-2026-93838
- https://github.com/sgl-project/sglang/issues/39764
- https://github.com/sgl-project/sglang
- https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/common/conn.py#L1636-L1640
- https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/common/staging_handler.py#L781
- https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/common/staging_handler.py#L848-L860
- https://www.vulncheck.com/advisories/sglang-through-0.5.20-unbounded-memory-allocation-via-staging-req-chunk-idx
- https://github.com/advisories/GHSA-2wcg-j54r-m6wm