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Advisories

SGLang through 0.5.20 Unbounded Memory Allocation via STAGING_REQ chunk_idx

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severity
high
date
Affecting

  • sglang <= 0.5.20

CWE
  • CWE-770 Allocation of Resources Without Limits or Throttling
CVSS
8.2
CVSS V4 Vector
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
Credit
Jiapeng Li, Mingkai Yu, Jiajia Liu
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.

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