What’s Vulnerable › Vulnerabilities

CVE-2024-4032: Incorrect IPv4 and IPv6 private ranges

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-06-17 · updated 2026-06-17
• Weakness: CWE-697

Description

The “ipaddress” module contained incorrect information about whether certain IPv4 and IPv6 addresses were designated as “globally reachable” or “private”. This affected the is_private and is_global properties of the ipaddress.IPv4Address, ipaddress.IPv4Network, ipaddress.IPv6Address, and ipaddress.IPv6Network classes, where values wouldn’t be returned in accordance with the latest information from the IANA Special-Purpose Address Registries. CPython 3.12.4 and 3.13.0a6 contain updated information from these registries and thus have the intended behavior.

Affected products

• Python Cpython: before 3.12.4; from 3.13.0a1 before 3.13.0a6 — fixed in 3.12.4, 3.13.0a6

How to fix

Upgrade to a fixed version: Python Cpython 3.12.4, 3.13.0a6. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2024/06/17/3
• https://github.com/python/cpython/commit/22adf29da8d99933ffed8647d3e0726edd16f7f8
• https://github.com/python/cpython/commit/40d75c2b7f5c67e254d0a025e0f2e2c7ada7f69f
• https://github.com/python/cpython/commit/895f7e2ac23eff4743143beef0f0c5ac71ea27d3
• https://github.com/python/cpython/commit/ba431579efdcbaed7a96f2ac4ea0775879a332fb
• https://github.com/python/cpython/commit/c62c9e518b784fe44432a3f4fc265fb95b651906
• https://github.com/python/cpython/commit/f86b17ac511e68192ba71f27e752321a3252cee3
• https://github.com/python/cpython/issues/113171
• https://github.com/python/cpython/pull/113179
• https://mail.python.org/archives/list/security-announce@python.org/thread/NRUHDUS2IV2USIZM2CVMSFL6SCKU3RZA/
• https://security.netapp.com/advisory/ntap-20240726-0004/
• https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml

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