SGLang through 0.5.20 Unbounded Memory Allocation via STAGING_REQ chunk_idx
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.
CVE-2026-93838
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-93838
sglang
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/sgl-project/sglang",
"vendor": "sgl-project",
"product": "sglang",
"versions": [
{
"status": "affected",
"version": "0",
"versionType": "semver",
"lessThanOrEqual": "0.5.20"
}
],
"packageURL": "pkg:pypi/sglang",
"collectionURL": "https://pypi.org/project/sglang",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-93838
Source reference:
/cveMetadata/cveId
Publisher severity
high
Source reference: /containers/cna/metrics
- Event
- #1711 · Revision 1
- Added to Heist Feed
- Publisher date