CVE-2026-87910

Impact

When tarfile extracts a link on a system that doesn't support links, it falls back to extracting a member from the archive. In this case, the filter function is run twice: once for the extracted member, and once with name set to the location of the link. For one of the calls, the return value was ignored. Instead, the member should be skipped if either call returns None.

Affected packages

This record carries no package version data, so it cannot be matched against a dependency list automatically. Read the advisory and compare your version by hand.

Weakness classification

References

• NVD record
• CVE.org record
• https://github.com/python/cpython/commit/2eb0c2f1dc71847731b6ab30aebefd058d482a7f
• https://github.com/python/cpython/commit/3105a3498aaf681ce128cf5baf83c2e5574267c5
• https://github.com/python/cpython/commit/764fd0af8d9e19d3684a58d2e58bf770f0605036
• https://github.com/python/cpython/commit/9c17bace90f88dfba6d0e2fe23c8e7ae35f83955
• https://github.com/python/cpython/commit/a4919937a4e1e69a0d178909c6f20557eca5d1d0
• https://github.com/python/cpython/commit/c1f106d240c4ffcb3608ed0a20e8aba6c865f6d3
• https://github.com/python/cpython/commit/d9565e54b1fc6d63c5be9afd58114499128fa57b
• https://github.com/python/cpython/commit/fb2f0bbc3b35264f09cc2cb2934b7987527a6bc2
• https://github.com/python/cpython/issues/157265
• https://github.com/python/cpython/pull/157266
• https://mail.python.org/archives/list/security-announce@python.org/thread/57TBTLL2W6APMZR3A25B2YV7GL3EPTDJ/
• http://www.openwall.com/lists/oss-security/2026/09/11/8