Vulnerability 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.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/sgl-project/sglang
- https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregat
- https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregat
- https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregat
- https://github.com/sgl-project/sglang/issues/39764
- https://www.vulncheck.com/advisories/sglang-through-0.5.20-unbounded-memory-allo
- https://github.com/sgl-project/sglang/issues/39764
FAQ
What is CVE-2026-93838?
CVE-2026-93838 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 disaggregatio...
How severe is CVE-2026-93838?
CVE-2026-93838 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-93838?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.