CVE-2026-87910: falha de média gravidade em Python Software Foundation CPython
tarfile hardlink fallback ignores custom extraction filter rejection via None
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13Vexday Risk Score
Sem sinal de exploração. Nenhum artefato público de exploração conhecido até agora.
ssvc Trackcvss 5.7epss 0.6%
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/AV:N/AC:L/AT:P/PR:L/UI:A/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Produtos afetados
Python Software Foundation · CPythonCVEs relacionadas — Python Software Foundation CPython
No mesmo produto, das mais perigosas para as menos.
CVE-2024-7592HIGHQuadratic complexity parsing cookies with backslashesEPSS 2.3%CVE-2024-6232HIGHRegular-expression DoS when parsing TarFile headersEPSS 2.2%CVE-2024-12254HIGHUnbounded memory buffering in SelectorSocketTransport.writelines()EPSS 1.9%CVE-2025-13836MEDIUMExcessive read buffering DoS in http.clientEPSS 1.7%CVE-2025-0938MEDIUMURL parser allowed square brackets in domain namesEPSS 1.6%CVE-2025-4138HIGHBypassing extraction filter to create symlinks to arbitrary targets outside extraction directoryEPSS 1.5%
Referências
https://github.com/python/cpython/commit/2eb0c2f1dc71847731b6ab30aebefd058d482a7fhttps://github.com/python/cpython/commit/3105a3498aaf681ce128cf5baf83c2e5574267c5https://github.com/python/cpython/commit/764fd0af8d9e19d3684a58d2e58bf770f0605036https://github.com/python/cpython/commit/9c17bace90f88dfba6d0e2fe23c8e7ae35f83955https://github.com/python/cpython/commit/a4919937a4e1e69a0d178909c6f20557eca5d1d0https://github.com/python/cpython/commit/c1f106d240c4ffcb3608ed0a20e8aba6c865f6d3https://github.com/python/cpython/commit/d9565e54b1fc6d63c5be9afd58114499128fa57bhttps://github.com/python/cpython/commit/fb2f0bbc3b35264f09cc2cb2934b7987527a6bc2https://github.com/python/cpython/issues/157265https://github.com/python/cpython/pull/157266https://mail.python.org/archives/list/security-announce@python.org/thread/57TBTLL2W6APMZR3A25B2YV7GL3EPTDJ/http://www.openwall.com/lists/oss-security/2026/09/11/8