---
id: CVE-2026-115825
title: >-
  HTTP::Server::PSGI versions before 1.0056 for Perl allow a single request to
  crash the server by declaring a large Content-Length
summary: >-
  HTTP::Server::PSGI versions before 1.0056 for Perl allow a single request to
  crash the server by declaring a large Content-Length.


  The request body is read with sysread() calls sized by the remaining
  Content-Length. Perl grows the read …
severity: none
cwe:
  - CWE-789
product: Plack
affected:
  - Plack < 1.0056
published: '2026-10-25'
updated: '2026-10-26'
sourceUpdated: '2026-10-26T01:23:53.588Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-115825'
references:
  - url: >-
      https://github.com/plack/Plack/commit/11545871cadc5df1b744cebb429cfeb4ebc1069a.patch
  - url: 'https://metacpan.org/release/MIYAGAWA/Plack-1.0056/changes'
tags:
  - cve.org
ingestedAt: '2026-10-25T22:08:29.942Z'
---

## Overview

HTTP::Server::PSGI versions before 1.0056 for Perl allow a single request to crash the server by declaring a large Content-Length.

The request body is read with sysread() calls sized by the remaining Content-Length. Perl grows the read buffer to the requested length before any data arrives, so the server tries to allocate as much memory as the client declares.

A remote attacker can send one request with a large Content-Length and a few body bytes, and perl exits with an out-of-memory error before the application is called. HTTP::Server::PSGI runs as a single process, so the server stays down until restarted.

## Affected

- `Plack < 1.0056`

## Remediation

Upgrade to Plack 1.0057 or later.