Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1336 CNY

100%
Buy Us a Coffee

CVE-2026-93838— SGLang through 0.5.20 Unbounded Memory Allocation via STAGING_REQ chunk_idx

Quick assessment

Affected
sgl-project sglang
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SGLang 版本 0.5.20 及更早版本存在一个无界内存分配漏洞，位于 函数中。该函数在处理 prefill/decode 分离部署中的 ZMQ STAGING_REQ 帧时，未能校验 参数。 在采用 prefill/decode 分离架构的部署环境中，能够访问 decode 引擎内部 ZMQ rank 端口的攻击者可以发送一个具有极大 值的帧，导致调度器持续分配内存直至系统内存耗尽，最终使进程终止。

CVSS 5.9 · Medium

Possible ATT&CK Techniques 1 AI

T1027 · Obfuscated Files or Information

Affected Version Matrix 1

VendorProduct Version RangeStatus
sgl-project sglang ≤ 0.5.20 affected
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-93838

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
SGLang through 0.5.20 Unbounded Memory Allocation via STAGING_REQ chunk_idx
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sgl-project sglang 0 ~ 0.5.20 -

II. Public POCs for CVE-2026-93838

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-93838

请登录查看更多情报信息。

Other References for CVE-2026-93838 (3)

IV. Related Vulnerabilities

Same product: sglang
Same vendor: sgl-project
Same weakness: CWE-770

V. Comments for CVE-2026-93838

No comments yet

Leave a comment