Pure-Python fallback of socket.socketpair() doesn’t authenticate peer connection

Description

The “socket” module provides a pure-Python fallback to the socket.socketpair() function for platforms that don’t support AF_UNIX, such as Windows. This pure-Python implementation uses AF_INET or AF_INET6 to create a local connected pair of sockets. The connection between the two sockets was not verified before passing the two sockets back to the user, which leaves the server socket vulnerable to a connection race from a malicious local peer. Platforms that support AF_UNIX such as Linux and macOS are not affected by this vulnerability. Versions prior to CPython 3.5 are not affected due to the vulnerable API not being included.

Timeline

Scores

EPSS (exploitation in 30 days)

0.25% · top 84% of all CVEs (8 Nov 2026)

CISA SSVC

Exploitation: none · Automatable: no · Technical impact: partial

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.1.

Weakness

• CWE-306 Missing Authentication for Critical Function (opens in a new tab)All about CWE-306 and its CVEs

Affected products

• Python Software Foundation · CPython

  • affected < 3.8.20
  • affected 3.9.0 – < 3.9.20
  • affected 3.10.0 – < 3.10.15
  • affected 3.11.0 – < 3.11.10
  • affected 3.12.0 – < 3.12.5
  • affected 3.13.0a1 – < 3.13.0rc1

References (19)

• https://github.com/python/cpython/pull/122134 (opens in a new tab)patchx_transferred
• https://github.com/python/cpython/issues/122133 (opens in a new tab)issue-trackingx_transferred
• https://mail.python.org/archives/list/[email protected]/thread/WYKDQWIERRE2ICIYMSVRZJO33GSCWU2B/ (opens in a new tab)vendor-advisoryx_transferred
• http://www.openwall.com/lists/oss-security/2024/07/29/3 (opens in a new tab)x_transferred
• https://github.com/python/cpython/commit/06fa244666ec6335a3b9bf2367e31b42b9a89b20 (opens in a new tab)patchx_transferred
• https://github.com/python/cpython/commit/0b65c8bf5367625673eafb92f85046a1b31259f2 (opens in a new tab)patchx_transferred
• https://github.com/python/cpython/commit/220e31adeaaa8436c9ff234cba1398bc49e2bb6c (opens in a new tab)patchx_transferred
• https://github.com/python/cpython/commit/5f90abaa786f994db3907fc31e2ee00ea2cf0929 (opens in a new tab)patchx_transferred
• https://github.com/python/cpython/commit/b252317956b7fc035bb3774ef6a177e227f9fc54 (opens in a new tab)patchx_transferred
• https://github.com/python/cpython/commit/2621a8a40ba4b2c68ca564671b7daa5da80a4508 (opens in a new tab)patch
• https://github.com/python/cpython/commit/5df322e91a40909e6904bbdbc0c3a6b6a9eead39 (opens in a new tab)patch
• https://github.com/python/cpython/commit/c21a36112a0028d7ac3cf8f480e0dc88dba5922c (opens in a new tab)patch
• https://github.com/python/cpython/commit/f071f01b7b7e19d7d6b3a4b0ec62f820ecb14660 (opens in a new tab)patch
• https://github.com/python/cpython/commit/31302f5fc24eecd693f0c8aaba7c2840b09b594d (opens in a new tab)patch
• https://github.com/python/cpython/commit/3f5d9d12c74787fbf3f5891835c85cc15526c86d (opens in a new tab)patch
• https://github.com/python/cpython/commit/c5655aa6ad120d2ed7f255bebd6e8b71a9c07dde (opens in a new tab)patch
• https://github.com/python/cpython/commit/e319f774f9e766a2b92949444a2d46081df3363a (opens in a new tab)patch
• https://github.com/python/cpython/commit/78df1043dbdce5c989600616f9f87b4ee72944e5 (opens in a new tab)patch
• https://security.netapp.com/advisory/ntap-20250502-0004/ (opens in a new tab)

Sources

The same CVE in the primary databases and aggregators, to check against.

• CVE.org record (opens in a new tab)
• CVE List JSON (GitHub) (opens in a new tab)
• NVD (opens in a new tab)
• FIRST EPSS (opens in a new tab)
• OSV.dev (opens in a new tab)
• GitHub Advisories (opens in a new tab)
• CIRCL Vulnerability-Lookup (opens in a new tab)

Badge for a README or a ticket

[![CVE-2024-3219](https://cveledger.app/badge/CVE-2024-3219.svg)](https://cveledger.app/cve/CVE-2024-3219)

Record last updated 2 May 2025, 23:02 UTC.