CVE-2026-114583
tar filter allows writing outside destination via empty-named symlink
MEDIUM 6.9
At a glance
- Source
- NVD
- EPSS
- EPSS 0.23 % · percentile 13 ()
- State
- PUBLISHED
- Published
- Updated
- Assigner
- PSF
- NVD status
- Awaiting Analysis
Description
tarfile.tar_filter could be bypassed using crafted link entries, including symlinks with empty or directory-like names, to redirect later archive members outside the intended extraction directory. This allowed a malicious tar archive to cause tarfile.extractall() with filter="tar" to write files outside the destination directory, subject to the permissions of the extracting process. This is the tarfile.tar_filter counterpart of CVE-2026-7774, which covered tarfile.data_filter.
References
- https://github.com/python/cpython/pull/160098
- https://github.com/python/cpython/issues/160097
- https://mail.python.org/archives/list/security-announce@python.org/thread/43JOWPRAV5DI3VZ4FUEUAZOHCATXXOCK/
- https://github.com/python/cpython/commit/0901ad4ffb22605f12b705d1c1197f0a01f0ba0b
- https://github.com/python/cpython/commit/c6ada40177436e4e2533a7b252082b5f0c043477
- https://github.com/python/cpython/commit/e7e0b3523ad6ba8472873dda594cf4021a16f8b5
- https://github.com/python/cpython/commit/04d8fca7da2cf3ebc0881fec8a53a1330c3b665d
- https://github.com/python/cpython/commit/bc93f8ad4c4a0f92d184ec8fccc8ff8a651dcec2
- https://github.com/python/cpython/commit/f4401da82e2baec5dab06cf070fbca77d53220f0
Scores
| Version | Score | Vector | Scored by |
|---|---|---|---|
| CVSS 4.0 | MEDIUM 6.9 | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N | PSF |
| CVSS 4.0 | MEDIUM 6.9 | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X | NVD · cna@python.org (Secondary) |
European references
- ENISA EUVD · EUVD-2026-108512
- GCVE · GCVE-0-2026-114583
CERT-FR advisories
- CERTFR-2026-AVI-1379 — Multiples vulnérabilités dans CPython · cert.ssi.gouv.fr
Affected products
| Product | Versions |
|---|---|
| Python Software Foundation · CPython | affected 0 < 3.11.18 ; affected 3.12.0 < 3.12.16 ; affected 3.13.0 < 3.13.18 ; affected 3.14.0 < 3.14.10 ; affected 3.15.0 < 3.15.2 ; affected 3.16.0a1 < 3.16.0 |
Sources
| Source | Licence |
|---|---|
| CVE List (CVEProject cvelistV5) | CVE Program Terms of Use |
| EPSS (FIRST.org) | FIRST — attribution requested |
| ENISA EUVD | ENISA — reproduction authorised, source acknowledged |
| CERT-FR (ANSSI) | Licence Ouverte / Etalab 2.0 |
| NVD (NIST) via fkie-cad/nvd-json-data-feeds | Public domain — this product uses data from the NVD API but is not endorsed or certified by the NVD |