# CVE-2020-10109: HTTP Request Smuggling in Twisted

Source: https://junglewise.ai/threats/cve-2020-10109-http-request-smuggling-in-twisted  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2020-03-12  
License: CC BY 4.0 with a link back

CVE-2020-10109 · Severity: low · CVSS 3.1 · Published 2020-03-12

In Twisted Web through 19.10.0, there was an HTTP request splitting vulnerability. 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 as a pipelined request.

Technologies: [twisted (PyPI)](https://junglewise.ai/threats/technologies/pypi-twisted). Vendors: [PyPI](https://junglewise.ai/threats/vendors/pypi).

## Quick answers

**Is CVE-2020-10109 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2020-10109 being exploited in the wild.

**How severe is CVE-2020-10109?** Low severity, with a CVSS score of 3.1, published 12 March 2020.

**Which products and versions are affected?** twisted (PyPI) ECOSYSTEM:introduced=0,fixed=20.3.0, ECOSYSTEM:introduced=0,fixed=20.3.0rc1.

**Is there a fix for CVE-2020-10109?** Yes. twisted (PyPI): upgrade to 20.3.0, 20.3.0rc1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**Am I affected by CVE-2020-10109?** Check whether you run twisted (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- twisted (PyPI): upgrade to 20.3.0, 20.3.0rc1 or later

  ```sh
  pip install "twisted>=20.3.0rc1"
  ```


## Affected products

- twisted (PyPI) ECOSYSTEM:introduced=0,fixed=20.3.0, ECOSYSTEM:introduced=0,fixed=20.3.0rc1

## Identifiers

- CVE-2020-10109
- GHSA-p5xh-vx83-mxcj
- PYSEC-2020-260

## Related threats

- [Twisted HTTP/2 server denial of service via rapid stream reset](https://junglewise.ai/threats/twisted-unauthenticated-remote-denial-of-service-in-the-twisted-http-2-0f2d7a0e)
- [Twisted: DNS Response Spoofing in twisted.names Due to Missing Source Address Validation](https://junglewise.ai/threats/cve-2026-83813-twisted-is-an-event-based-framework-for-internet-applications)
- [Twisted HTTP request smuggling via bare CR or LF in header](https://junglewise.ai/threats/cve-2026-115877-twisted-http-request-smuggling-in-twisted-web-via-a-bare-cr-or)
- [Twisted conch telnet unbounded subnegotiation buffer denial of service](https://junglewise.ai/threats/cve-2026-115778-twisted-unauthenticated-remote-denial-of-service-in-the-twisted)
- [Twisted is an event-based framework for internet applications, supporting Python 3.6+. Prior to 26.10.0rc1, twisted.words.protocols.irc.IRC.](https://junglewise.ai/threats/cve-2026-115776-twisted-unauthenticated-remote-denial-of-service-in-the-twisted)