# CVE-2026-69249: python-cryptography: Duplicate self-signed intermediates can cause exponential path-building CVE-2026-69249 is fixed in 3 products on 1 platform, first by python3-cryptography 46.0.5-1ubuntu2.2, released August 3, 2026. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2026-69249 - Priority: High - CVSS: 7.5 (Important) - EPSS: 0.0026 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Aug 3, 2026 - Weakness: Uncontrolled Resource Consumption - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-69249 ## Description python-cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. In versions 42.0.0 through 48.0.0, when resolving invalid certificate chains that include duplicate copies of self-signed certificates, the processing recursively invokes the same candidate, leading to an exponential blowup. Although the limitation that the chain depth cannot exceed a specified maximum depth prevents unbounded recursion and guarantees termination, an attacker-controlled certificate chain can lead the processing to easily take more than 5s to reject in testing. This amplification could form the basis for a resource exhaustion denial of service attack. The core issue arises in the recursive nature of build_chain_inner, which does not de-duplicate against previously analyzed candidates. As the correctness of validation is not affected, the integrity of a system cannot be compromised through this vector, only its availability. This issue is fixed in 49.0.0. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | python-cryptography Debian 14 | 49.0.0-1 | [DEBIAN-CVE-2026-69249](https://patchblox.com/security/data/fix/linux/debian-cve-2026-69249.md) | Aug 22, 2026 | | Linux | python-cryptography RHEL 10 | 43.0.0-4.el10_0.1 | [RHSA-2026:71659](https://patchblox.com/security/data/fix/linux/rhsa-2026-71659.md) | Aug 3, 2026 | | Linux | python-cryptography opensuse-leap 16.0 | 44.0.3-160000.5.1 | [OPENSUSE-SU-2026:21685-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21685-1.md) | Aug 30, 2026 | | Linux | python-cryptography rocky 10 | 0:43.0.0-4.el10_2.5 | [RLSA-2026:71658](https://patchblox.com/security/data/fix/linux/rlsa-2026-71658.md) | Sep 26, 2026 | | Linux | python-cryptography sles 16.0 | 44.0.3-160000.5.1 | [SUSE-SU-2026:23570-1](https://patchblox.com/security/data/fix/linux/suse-su-2026-23570-1.md) | Aug 30, 2026 | | Linux | python3-cryptography Ubuntu 26.04.1 LTS (resolute) | 46.0.5-1ubuntu2.2 | [python3-cryptography 46.0.5-1ubuntu2.2](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-python3-cryptography-46.0.5-1ubuntu2.2.md) | Aug 3, 2026 | | Linux | python3-cryptography almalinux 10 | 43.0.0-4.el10_2.5 | [ALSA-2026:71658](https://patchblox.com/security/data/fix/linux/alsa-2026-71658.md) | Sep 24, 2026 | | Linux | python3-cryptography ol 10 | 0:43.0.0-4.el10_2.5 | [ELSA-2026-71658](https://patchblox.com/security/data/fix/linux/elsa-2026-71658.md) | Sep 25, 2026 | | Linux | python3.14-cryptography RHEL 10 | 45.0.4-4.el10_2.5 | [RHSA-2026:64795](https://patchblox.com/security/data/fix/linux/rhsa-2026-64795.md) | Aug 3, 2026 | | Linux | python3.14-cryptography RHEL 9 | 0:45.0.4-4.el9_8.6 | [RHSA-2026:64774](https://patchblox.com/security/data/fix/linux/rhsa-2026-64774.md) | Sep 13, 2026 | | Linux | python3.14-cryptography almalinux 10 | 45.0.4-4.el10_2.5 | [ALSA-2026:64795](https://patchblox.com/security/data/fix/linux/alsa-2026-64795.md) | Sep 8, 2026 | | Linux | python3.14-cryptography almalinux 9 | 45.0.4-4.el9_8.6 | [ALSA-2026:64774](https://patchblox.com/security/data/fix/linux/alsa-2026-64774.md) | Sep 8, 2026 | | Linux | python3.14-cryptography ol 10 | 0:45.0.4-4.el10_2.5 | [ELSA-2026-64795-0](https://patchblox.com/security/data/fix/linux/elsa-2026-64795-0.md) | Sep 9, 2026 | | Linux | python3.14-cryptography ol 9 | 0:45.0.4-4.el9_8.6 | [ELSA-2026-64774-0](https://patchblox.com/security/data/fix/linux/elsa-2026-64774-0.md) | Sep 8, 2026 | | Linux | python3.14-cryptography rocky 10 | 0:45.0.4-4.el10_2.5 | [RLSA-2026:64795](https://patchblox.com/security/data/fix/linux/rlsa-2026-64795.md) | Sep 9, 2026 | | Linux | python3.14-cryptography rocky 9 | 0:45.0.4-4.el9_8.6 | [RLSA-2026:64774](https://patchblox.com/security/data/fix/linux/rlsa-2026-64774.md) | Sep 9, 2026 | --- Data as of 2026-11-08T00:53:09Z UTC. 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