---
id: CVE-2026-44545
aliases:
  - GHSA-rrc9-mx66-ffcm
  - PYSEC-2026-213
title: >-
  daphne: Unauthenticated attackers can cause excessive memory consumption by
  sending arbitrarily large WebSocket messages/frames
summary: >-
  daphne: Unauthenticated attackers can cause excessive memory consumption by
  sending arbitrarily large WebSocket messages/frames
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'
vendor: daphne
product: daphne
ecosystem: pip
affected:
  - daphne < 4.2.2
patched:
  - daphne 4.2.2
published: '2026-06-03'
updated: '2026-07-11'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-rrc9-mx66-ffcm'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-44545'
  - url: 'https://github.com/django/daphne'
  - url: 'https://github.com/django/daphne/blob/main/CHANGELOG.txt'
  - url: >-
      https://github.com/pypa/advisory-database/tree/main/vulns/daphne/PYSEC-2026-213.yaml
tags:
  - osv
  - pip
epss: 0.00328
epssPercentile: 0.26118
ingestedAt: '2026-07-12T18:57:28.026Z'
---

## Overview

daphne before 4.2.2 did not pass maxFramePayloadSize or maxMessagePayloadSize to Autobahn's WebSocketServerFactory. Because Autobahn defaults both values to 0 (unlimited), an unauthenticated remote attacker could send arbitrarily large WebSocket messages or frames, causing excessive memory consumption and a denial of service.

## Affected packages

- `daphne < 4.2.2`

## Remediation

Upgrade to a patched release:

- `daphne 4.2.2`