CVE-2026-87910

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.

CVSS 4.0

5.7CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

EPSS

0.6% chance of exploitation in the next 30 days; higher than 48% of CVEs (scores of 2026-10-25)

CWEs

CWE-22, CWE-59

Published

2026-09-11

Modified

2026-10-22

Record from

the NVD, synced 2026-10-22

References

• 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

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