# CVE-2026-44545: python-daphne: daphne before 4.2.2 did not pass maxFramePayloadSize or maxMessagePayloadSize to Autobahn's WebSocketServerFactory

CVE-2026-44545 is fixed in python-daphne on 1 platform, first by DEBIAN-CVE-2026-44545, released June 29, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-44545
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0033
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 3, 2026

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-daphne Debian 13.5 (trixie) | 4.1.2-2+deb13u1 | [DEBIAN-CVE-2026-44545](https://patchblox.com/security/data/fix/linux/debian-cve-2026-44545.md) | Jun 29, 2026 |
| Linux | python-daphne Debian 14 | 4.2.2-0.1 | [DEBIAN-CVE-2026-44545](https://patchblox.com/security/data/fix/linux/debian-cve-2026-44545.md) | Jun 29, 2026 |

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Data as of 2026-11-08T00:53:09Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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