| Name | CVE-2026-87910 |
| Description | 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. |
| Source | CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more) |
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|---|---|---|
| pypy3 (PTS) | bookworm | 7.3.11+dfsg-2+deb12u3 | fixed |
| trixie | 7.3.19+dfsg-2 | vulnerable | |
| forky, sid | 8.0.0+dfsg-1 | vulnerable | |
| python3.11 (PTS) | bookworm | 3.11.2-6+deb12u8 | fixed |
| bookworm (security) | 3.11.2-6+deb12u3 | fixed | |
| python3.13 (PTS) | trixie | 3.13.5-2+deb13u5 | vulnerable |
| forky, sid | 3.13.15-1 | vulnerable | |
| python3.14 (PTS) | forky | 3.14.7-4 | vulnerable |
| sid | 3.14.8-1 | vulnerable | |
| python3.15 (PTS) | forky, sid | 3.15.0~rc2-3 | vulnerable |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|---|---|---|---|---|---|
| pypy3 | source | bookworm | (not affected) | |||
| pypy3 | source | (unstable) | (unfixed) | |||
| python3.11 | source | (unstable) | (not affected) | |||
| python3.13 | source | (unstable) | (unfixed) | |||
| python3.14 | source | (unstable) | (unfixed) | |||
| python3.15 | source | (unstable) | (unfixed) |
[trixie] - python3.13 <no-dsa> (Minor issue)
- python3.11 <not-affected> (extraction filters (PEP 706) absent in 3.11.2)
[trixie] - pypy3 <no-dsa> (Minor issue)
[bookworm] - pypy3 <not-affected> (extraction filters (PEP 706) absent in stdlib 3.9.16)
https://mail.python.org/archives/list/security-announce@python.org/thread/57TBTLL2W6APMZR3A25B2YV7GL3EPTDJ/
https://github.com/python/cpython/issues/157265
https://github.com/python/cpython/pull/157266
https://github.com/python/cpython/commit/fb2f0bbc3b35264f09cc2cb2934b7987527a6bc2 (main)
Same code situation as with CVE-2025-4435.