---
id: CVE-2026-57487
title: >-
  libupnp: libupnp: Denial of Service via oversized chunked HTTP requests
  (CVE-2026-57487)
summary: >-
  A flaw was found in libupnp. The HTTP parser fails to enforce configured
  message size limits when processing chunked transfer-encoded HTTP requests. A
  remote attacker can exploit this vulnerability by sending an excessively large
  chunked p…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe:
  - CWE-770
vendor: Red Hat
product: pupnp
affected:
  - pupnp < 2.0.2
published: '2026-10-16'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T09:30:56+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-57487.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-57487.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-57487'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-57487'
  - url: 'https://github.com/pupnp/pupnp/security/advisories/GHSA-gcj7-j9f7-q84c'
    label: 'https://github.com/pupnp/pupnp/security/advisories/GHSA-gcj7-j9f7-q84c'
  - url: >-
      https://github.com/pupnp/pupnp/commit/9ff9bc583ad8ee4ba022634434a7b71db9bd96e1
    label: >-
      https://github.com/pupnp/pupnp/commit/9ff9bc583ad8ee4ba022634434a7b71db9bd96e1
  - url: 'https://github.com/pupnp/pupnp/releases/tag/release-2.0.2'
    label: 'https://github.com/pupnp/pupnp/releases/tag/release-2.0.2'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.0041
epssPercentile: 0.35024
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-21T02:21:26.610826Z'
ingestedAt: '2026-10-16T17:24:46.756Z'
---

## Overview

A flaw was found in libupnp. The HTTP parser fails to enforce configured message size limits when processing chunked transfer-encoded HTTP requests. A remote attacker can exploit this vulnerability by sending an excessively large chunked payload, forcing the application to buffer data beyond intended boundaries. This issue leads to memory exhaustion and a Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · updated 2026-10-21 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-57487.json)

**libupnp: libupnp: Denial of Service via oversized chunked HTTP requests**. Released 2026-10-16, updated 2026-10-21.

Not affected:

- All currently supported Red Hat products

## Remediation

Refer to the advisory for fix availability.