Twisted vulnerable to HTTP Request Smuggling Attacks
Impact
Twisted Web is vulnerable to request smuggling attacks:
- "When presented with two content-length headers, Twisted Web ignored the first header. When the second content-length was set to zero this caused Twisted Web to interpret the request body as a pipelined request. According to RFC 7230 Section 3.3.3#4, if a message is received with multiple content-length headers with differing value, then the server must reject the message with a 400 response." (Jake Miller of Bishop Fox Security)
- " When presented with a content-length and a chunked encoding header, the content-length took precedence and the remainder of the request body was interpreted by Twisted Web as a pipelined request. According to RFC 7230 Section 3.3.3#3, if a message with both content-length and chunked encoding is accepted, transfer-encoding overrides the content-length." (Jake Miller of Bishop Fox Security)
"Twisted should not allow BWS between the filed-name and colon." (ZeddYu Lu)closed in 9646- "Two CL header with different values is also not allowed." (ZeddYu Lu)
- "Only accept identity and chunked Transport-Encoding." (ZeddYu Lu)
Patches
https://github.com/twisted/twisted/commit/20c787a14a09e7cbd5dfd8df08ceff00d1fcc081 https://github.com/twisted/twisted/commit/4a7d22e490bb8ff836892cc99a1f54b85ccb0281
Workarounds
N/A
References
Affected software
Click a technology to see all vulnerabilities affecting it.
| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| Python (PyPI) | twisted | < 20.3.0 | 20.3.0 |
References
- Weakness (CWE)
-- Platform
- Python (PyPI)
- Package
twisted- Disclosed
- 07.10.2022
- Updated
- 11.10.2026 12:18
Sources and licenses
OSV / GitHub Advisory Database - GHSA-8r99-h8j2-rw64 - CC BY 4.0
Vulnerability history: twisted
All published vulnerabilities of this package (Python (PyPI)), newest first. Shows whether this is a one-off slip or a package that needs watching.
- Total entries
- 17
- First → latest
- 06.2019 10.2026
- Without a fix
- 1
- Exploited in attacks
- 0
Severity breakdown
- Critical 5
- High 4
- Medium 8
Disclosures per year
- 2019: 3
- 2020: 3
- 2021: 0
- 2022: 6
- 2023: 1
- 2024: 2
- 2025: 0
- 2026: 2
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Twisted vulnerable to HTTP Request Smuggling Attacks this entry
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