CVE-2026-69249 - python-cryptography: Duplicate self-signed intermediates can cause exponential path-building

CVE-2026-69249 - python-cryptography: Duplicate self-signed intermediates can cause exponential path-building

https://cvefeed.io/rssfeed/latest.atom / Tue, 08/04/2026 - 01:09
CVE ID :CVE-2026-69249
Published : Aug. 3, 2026, 10:16 p.m. | 37 minutes ago
Description :python-cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 49.0.0, 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.
Severity: 8.7 | HIGH
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