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CVE-2026-115865— Starlet versions before 0.33 for Perl allow a request declaring a large Content-Length to kill a worker by exhausting memory

Quick assessment

Affected
CVE-2026-115865
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.

Perl 的 Starlet 0.33 之前版本存在漏洞：攻击者可通过发送声明了超大 Content-Length 的请求，耗尽内存并导致工作进程（worker）终止。 该漏洞的成因在于：请求体是在一个循环中读取的，每次调用 sysread 时都会尝试一次性读取剩余声明长度对应的所有数据。在接收到任何实际数据之前，Perl 会先将读取缓冲区扩展至该声明长度。因此，若声明的长度超过可用内存，工作进程会在应用程序被调用之前，因无法捕获的内存不足错误而退出。 远程攻击者可通过每次仅发送几字节的请求，反复触发工作进程重启，

AI Predicted 5.9 Difficulty: Trivial

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
None None < 0.33 affected

I. Basic Information for CVE-2026-115865

Vulnerability Information
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Vulnerability Title
Starlet versions before 0.33 for Perl allow a request declaring a large Content-Length to kill a worker by exhausting memory
Source: CVE Program / CVE List V5
Vulnerability Description
Starlet versions before 0.33 for Perl allow a request declaring a large Content-Length to kill a worker by exhausting memory. The request body is read in a loop that asks sysread for all of the remaining declared length at once. Perl grows the read buffer to that size before any data arrives, so a length larger than available memory makes the worker exit with an uncatchable out of memory error before the application is called. A remote attacker can force a worker restart with each request of a few bytes.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
- - 0 ~ 0.33 -

II. Public POCs for CVE-2026-115865

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III. Intelligence Information for CVE-2026-115865

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Patches & Fixes for CVE-2026-115865 (1)

Vendor Pages for CVE-2026-115865 (1)

IV. Related Vulnerabilities

Same weakness: CWE-789