tarfile hardlink fallback ignores custom extraction filter rejection via None
CVE-2026-87910 is fixed in 34 products on 3 platforms, first by DEBIAN-CVE-2026-87910, released September 11, 2026. 10 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: Routine.
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.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Python 3.13 | 3.13.16 | Python 3.13 3.13.16 | Sep 30, 2026 |
| Python 3.14 | 3.14.9 | Python 3.14 3.14.9 | Oct 21, 2026 |
| Linux | |||
| pypy3 · Debian 14 | 8.0.1+dfsg-1 | DEBIAN-CVE-2026-87910 | Sep 11, 2026 |
| python3.11 · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-debug · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-debuginfo · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-debugsource · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-devel · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-idle · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-libs · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-test · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.11-tkinter · amzn 2023 | 3.11.17-1.amzn2023.0.1 | ALAS2023-2026-3231 | Nov 7, 2026 |
| python3.12 · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-debug · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-debuginfo · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-debugsource · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-devel · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-idle · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-libs · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-test · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.12-tkinter · amzn 2023 | 3.12.15-2.amzn2023.0.1 | ALAS2023-2026-3230 | Nov 7, 2026 |
| python3.13 · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-debug · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-debuginfo · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-debugsource · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-devel · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-freethreading · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-freethreading-debug · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-idle · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-libs · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-test · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.13-tkinter · amzn 2023 | 3.13.16-1.amzn2023.0.1 | ALAS2023-2026-3229 | Nov 7, 2026 |
| python3.14 · Debian 14 | 3.14.9-1 | DEBIAN-CVE-2026-87910 | Sep 11, 2026 |
| python3.15 · Debian 14 | 3.15.0~rc3-1 | DEBIAN-CVE-2026-87910 | Sep 11, 2026 |
| No fix yet | |||
| Python 2 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.10 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.11 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.12 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.5 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.6 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.7 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.8 (Windows apps) | No fix yet | no-fix | n/a |
| Python 3.9 (Windows apps) | No fix yet | no-fix | n/a |
| Python3 (macOS) | No fix yet | no-fix | n/a |
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