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CVE-2026-109225— SGLang through 0.5.21 Memory Exhaustion DoS via /v1/audio/transcriptions Upload

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 0.5.21 及之前的版本存在一个无限制内存分配漏洞，该漏洞允许未经身份验证的远程攻击者通过向 /v1/audio/transcriptions 上传超大文件来耗尽内存。攻击者可发送并发的多部分大文件上传请求，这些文件在验证前会被全部加载到内存中，从而导致 HTTP/分词器工作进程崩溃，引发拒绝服务（DoS）攻击。

CVSS 7.5 · High EPSS 0.43% · P35

Affected Version Matrix 1

VendorProduct Version RangeStatus
sgl-project sglang ≤ 0.5.21 affected
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I. Basic Information for CVE-2026-109225

Vulnerability Information
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Vulnerability Title
SGLang through 0.5.21 Memory Exhaustion DoS via /v1/audio/transcriptions Upload
Source: CVE Program / CVE List V5
Vulnerability Description
SGLang through 0.5.21 contains an unbounded memory allocation vulnerability that allows unauthenticated remote attackers to exhaust memory by uploading oversized files to /v1/audio/transcriptions. Attackers can send concurrent large multipart uploads, which are fully read into memory before validation, to crash the HTTP/tokenizer worker and deny service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/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 ~ 0.5.21 -

II. Public POCs for CVE-2026-109225

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III. Intelligence Information for CVE-2026-109225

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Vendor Advisories for CVE-2026-109225 (1)

Other References for CVE-2026-109225 (2)

Same Patch Batch · sgl-project · 2026-10-12 · 5 CVEs total

CVE-2026-109226 7.5 HIGH SGLang through 0.5.21 Audio Decompression Amplification via load_audio
CVE-2026-109227 7.5 HIGH SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing
CVE-2026-109228 7.5 HIGH SGLang through 0.5.21 Resource Budget Bypass via GLM-V Video Parameters
CVE-2026-109229 7.5 HIGH SGLang through 0.5.21 Decompression Bomb DoS via NanoNemotronVLImageProcessor

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-109225

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