# CVE-2026-44546: python-daphne: daphne before 4.2.2 reconstructs a raw HTTP request from Twisted's parsed headers and feeds it to autobahn for WebSoc...

CVE-2026-44546 is fixed in python-daphne on 1 platform, first by DEBIAN-CVE-2026-44546, released June 29, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-44546
- Priority: Routine
- CVSS: 5.3 (medium)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 3, 2026

## Description

daphne before 4.2.2 reconstructs a raw HTTP request from Twisted's parsed headers and feeds it to autobahn for WebSocket handshake processing. Twisted does not treat \x0b, \x0c, \x1c, \x1d, \x1e, or \x85 as header line separators, but autobahn decodes header values to str and calls splitlines(). An attacker can exploit this parser differential to inject additional headers into the ASGI scope passed to the application. daphne now rejects requests with these bytes in any header value with a 400 response.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | python-daphne Debian 13.5 (trixie) | 4.1.2-2+deb13u1 | [DEBIAN-CVE-2026-44546](https://patchblox.com/security/data/fix/linux/debian-cve-2026-44546.md) | Jun 29, 2026 |
| Linux | python-daphne Debian 14 | 4.2.2-0.1 | [DEBIAN-CVE-2026-44546](https://patchblox.com/security/data/fix/linux/debian-cve-2026-44546.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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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