VDB
CVE-2026-93838
CVE-2026-93838
PUBLISHED
CVSS 8.2 HIGH
SGLang through 0.5.20 Unbounded Memory Allocation via STAGING_REQ chunk_idx
Reported by vulncheck · Published September 18, 2026
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.
Risk scores
CVSS 4.0
8.2
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
| Vendor | Product | Versions |
|---|---|---|
| sgl-project | sglang | 0 |
| lmsys | sglang | 0 |
| sgl-project | sglang | 0 |
Timeline
- Sep 18, 2026 CVE Published
- Sep 19, 2026 EPSS Score (18 in total, the first dated here)
- Sep 24, 2026 CVE Updated
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References
- GitHub Issue #39764 issue-tracking
- product
- technical-description
- technical-description
- technical-description
- VulnCheck Advisory: SGLang through 0.5.20 Unbounded Memory Allocation via STAGING_REQ chunk_idx third-party-advisory