Path traversal in CPython tarfile tar filter lets archives write files
Key facts
- Attack vector
- Local
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Attack requirements
- None
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Partial Red Hat: 9 without a fix
Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.
Summary
CPython is affected before 3.11.18, from 3.12.0 before 3.12.16, from 3.13.0 before 3.13.18, from 3.14.0 before 3.14.10, from 3.15.0 before 3.15.2 and from 3.16.0a1 before 3.16.0. Crafted link entries, such as symlinks with empty or directory-like names, bypass the tarfile.tar_filter check (CWE-22). A malicious tar archive can make tarfile.extractall() with filter="tar" write files outside the destination directory.
Written with Claude Haiku 5.5 from the sources below · 2026-11-04
Description from the CNA
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.
Why it matters now
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Python Software Foundation | CPython | before 3.11.18; 3.12.0 to before 3.12.16; 3.13.0 to before 3.13.18; 3.14.0 to before 3.14.10; 3.15.0 to before 3.15.2; 3.16.0a1 to before 3.16.0 | 3.11.18, 3.12.16, 3.13.18, 3.14.10, 3.15.2, 3.16.0 | Patch available | CNA |
- CPython VendorPython Software Foundation Affected before 3.11.18; 3.12.0 to before 3.12.16; 3.13.0 to before 3.13.18; 3.14.0 to before 3.14.10; 3.15.0 to before 3.15.2; 3.16.0a1 to before 3.16.0 Fixed in 3.11.18, 3.12.16, 3.13.18, 3.14.10, 3.15.2, 3.16.0 Patch available CNA
CPE names Threatist (inferred) · 1
Inferred from how NVD named this product before; not given by a source.
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:python:python:*:*:*:*:*:*:*:* | — | — | python-pillow |
- cpe:2.3:a:python:python:*:*:*:*:*:*:*:* Versions — — ·python-pillow
Remediation
Upgrade CPython to 3.11.18, 3.12.16, 3.13.18, 3.14.10, 3.15.2 or 3.16.0. Red Hat has no fix planned for Red Hat Enterprise Linux 6 and lists no available fix for Red Hat Enterprise Linux 7, 8, 9 and 10, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat Hardened Images, Red Hat OpenShift Virtualization 4 and Self-service automation portal 2.
Written with Claude Haiku 5.5 from the sources below · 2026-11-04
- Fix · CNA CPython (Python Software Foundation) Fixed in 3.11.18, 3.12.16, 3.13.18, 3.14.10, 3.15.2, 3.16.0
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet |
| Red Hat Enterprise Linux AI (RHEL AI) 3 | Affected | No fix yet: Fix deferred |
| Red Hat Hardened Images | Affected | No fix yet |
| Red Hat OpenShift Virtualization 4 | Affected | No fix yet: Fix deferred |
| Self-service automation portal 2 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-23 Threatist record created from CVE-2026-114583
- 2026-10-23 Alias added: GHSA-mw29-5qxh-rr87
- 2026-10-23 Priority changed: MEDIUM → LOW
- 2026-10-26 Fix available: Python Software Foundation/[email protected], Python Software Foundation/[email protected], Python Software Foundation/[email protected] · CNA
- 2026-10-26 3 new references · CNA
- 2026-10-27 Fix available: Python Software Foundation/[email protected], Python Software Foundation/[email protected] · CNA
- 2026-11-02 Weakness changed · CISA ADP
- 2026-11-02 CISA SSVC decision points changed
- 2026-11-04 Affected versions changed · Red Hat
- 2026-11-04 CVSS score added · Red Hat
References
Patch 7
- https://github.com/python/cpython/pull/160098
- 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
More Python Software Foundation vulnerabilities
- TI-2024-07037 Quadratic complexity parsing cookies with backslashes CVSS 3.1HIGH 7.5
- TI-2024-11791 Bypass extraction filter to modify file metadata outside extraction directory CVSS 3.1MEDIUM 5.3
- TI-2024-00411 Quoted zip-bomb protection for zipfile CVSS 3.1MEDIUM 6.2
- TI-2026-13296 `HTTPPasswordMgr` can send saved HTTPS credentials via HTTP because of incorrect scheme matching CVSS 4.0MEDIUM 6.0
- TI-2024-06422 Email header injection due to unquoted newlines CVSS 3.1MEDIUM 5.5
- TI-2026-04606 Possible to hijack modules in current working directory CVSS 4.0MEDIUM 5.6
Sources
- CVE-2026-114583 · CVE Program
- CVE-2026-114583 · NVD
- FIRST EPSS
- GHSA-mw29-5qxh-rr87 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-114583 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences