Distrust compromised intermediate certificates in ssl module
CVE-2026-115557 is fixed in 21 products on 3 platforms, first by Python 3.14 3.14.10, released October 25, 2026. 11 other affected products have no fix yet. It is not reported as exploited. Patch Radar priority: Urgent.
Python has added a denylist for known compromised certificates to the "ssl" module to ensure user safety even without certificate revocation configured. Known compromised certificates will automatically be rejected regardless of the SSLContext policy configuration.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Python 3.14 | 3.14.10 | Python 3.14 3.14.10 | Oct 25, 2026 |
| Linux | |||
| python3.11 · amzn 2023 | 3.11.18-1.amzn2023.0.1 | ALAS2023-2026-3356 | Nov 7, 2026 |
| python3.11-debug · amzn 2023 | 3.11.18-1.amzn2023.0.1 | ALAS2023-2026-3356 | Nov 7, 2026 |
| python3.11-debuginfo · amzn 2023 | 3.11.18-1.amzn2023.0.1 | ALAS2023-2026-3356 | Nov 7, 2026 |
| python3.11-debugsource · amzn 2023 | 3.11.18-1.amzn2023.0.1 | ALAS2023-2026-3356 | Nov 7, 2026 |
| python3.11-devel · amzn 2023 | 3.11.18-1.amzn2023.0.1 | ALAS2023-2026-3356 | Nov 7, 2026 |
| python3.11-idle · amzn 2023 | 3.11.18-1.amzn2023.0.1 | ALAS2023-2026-3356 | Nov 7, 2026 |
| python3.11-libs · amzn 2023 | 3.11.18-1.amzn2023.0.1 | ALAS2023-2026-3356 | Nov 7, 2026 |
| python3.11-test · amzn 2023 | 3.11.18-1.amzn2023.0.1 | ALAS2023-2026-3356 | Nov 7, 2026 |
| python3.11-tkinter · amzn 2023 | 3.11.18-1.amzn2023.0.1 | ALAS2023-2026-3356 | Nov 7, 2026 |
| python3.12 · Fedora 43 | 3.12.16-2.fc43 | FEDORA-2026-4E3279AF04 | Nov 8, 2026 |
| python3.12-debug · Fedora 43 | 3.12.16-2.fc43 | FEDORA-2026-4E3279AF04 | Nov 8, 2026 |
| python3.12-debuginfo · Fedora 43 | 3.12.16-2.fc43 | FEDORA-2026-4E3279AF04 | Nov 8, 2026 |
| python3.12-debugsource · Fedora 43 | 3.12.16-2.fc43 | FEDORA-2026-4E3279AF04 | Nov 8, 2026 |
| python3.12-devel · Fedora 43 | 3.12.16-2.fc43 | FEDORA-2026-4E3279AF04 | Nov 8, 2026 |
| python3.12-idle · Fedora 43 | 3.12.16-2.fc43 | FEDORA-2026-4E3279AF04 | Nov 8, 2026 |
| python3.12-libs · Fedora 43 | 3.12.16-2.fc43 | FEDORA-2026-4E3279AF04 | Nov 8, 2026 |
| python3.12-test · Fedora 43 | 3.12.16-2.fc43 | FEDORA-2026-4E3279AF04 | Nov 8, 2026 |
| python3.12-tkinter · Fedora 43 | 3.12.16-2.fc43 | FEDORA-2026-4E3279AF04 | Nov 8, 2026 |
| python3.14 · Debian 14 | 3.14.10-1 | DEBIAN-CVE-2026-115557 | Nov 3, 2026 |
| python3.15 · Debian 14 | 3.15.2-1 | DEBIAN-CVE-2026-115557 | Nov 3, 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 3.13 (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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