| Name | CVE-2026-4360 |
| Description | In the Tarfile.extract() function, the filter parameter is not passed properly when extracting hardlinks. An affected system that extracts content from untrusted tar files could end up writing files with an unexpected uid/gid despite the user passing filter='data' to the extract() function. |
| 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) |
| Debian Bugs | 1141531 |
Vulnerable and fixed packages
The table below lists information on source packages.
| Source Package | Release | Version | Status |
|---|
| jython (PTS) | forky, sid, bookworm, trixie | 2.7.3+repack1-1 | fixed |
| pypy3 (PTS) | bookworm | 7.3.11+dfsg-2+deb12u3 | fixed |
| trixie | 7.3.19+dfsg-2 | vulnerable |
| forky, sid | 7.3.23+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+deb13u3 | vulnerable |
| forky, sid | 3.13.15-1 | fixed |
| python3.14 (PTS) | forky | 3.14.7-1 | fixed |
| sid | 3.14.7-3 | fixed |
The information below is based on the following data on fixed versions.
| Package | Type | Release | Fixed Version | Urgency | Origin | Debian Bugs |
|---|
| jython | source | (unstable) | (not affected) | | | |
| pypy3 | source | bullseye | (not affected) | | | |
| pypy3 | source | bookworm | (not affected) | | | |
| pypy3 | source | (unstable) | (unfixed) | | | 1141531 |
| python2.7 | source | (unstable) | (not affected) | | | |
| python3.11 | source | (unstable) | (not affected) | | | |
| python3.13 | source | (unstable) | 3.13.15-1 | | | |
| python3.14 | source | (unstable) | 3.14.7-1 | | | |
| python3.9 | source | (unstable) | (not affected) | | | |
Notes
[trixie] - python3.13 <no-dsa> (Minor issue)
- python3.11 <not-affected> (Vulnerable code didn't get backported to the version in Bookworm)
- python3.9 <not-affected> (extraction filters (PEP 706) absent in 3.9.2; extract() has no filter parameter)
- python2.7 <not-affected> (extraction filters (PEP 706) absent in py2; extract() has no filter parameter)
- jython <not-affected> (extraction filters/PEP 706 absent in bundled python2.7 stdlib; tarfile.extract() has no filter parameter)
[trixie] - pypy3 <no-dsa> (Minor issue)
[bookworm] - pypy3 <not-affected> (Vulnerable code backported down to stdlib-3.9.17; embedding 3.6.16)
[bullseye] - pypy3 <not-affected> (Vulnerable code backported down to stdlib-3.9.17; embedding 3.6.9)
https://mail.python.org/archives/list/security-announce@python.org/thread/TWZW2PC2AZOV6FENIHFSRC63OM7MBGSB/
https://github.com/python/cpython/issues/151987
https://github.com/python/cpython/pull/151988
https://github.com/python/cpython/commit/7b57e8d51446297b8c7c482d224bc5f1938e4301 (v3.15.0b4)
https://github.com/python/cpython/commit/5e0ef3f1afe892e4f64eb83368db57ac4c40cba0 (v3.14.7)
https://github.com/python/cpython/commit/eee3ddf0ca10283cc7fea724aae9cd8665f8d15e (v3.13.15)
Same code situation as with CVE-2025-4435.