Threats Tagged 'cve-2026-69249'

Python is an interpreted, interactive, object-oriented programming language, which includes modules, classes, exceptions, very high level dynamic data types and dynamic typing. Python supports interfaces to many system calls and libraries, as well as to various windowing systems. Security Fix(es): * python-cryptography: python-cryptography: Duplicate self-signed intermediates can cause exponential path-building (CVE-2026-69249) * python-cryptography: python-cryptography: python-cryptography verifier accepts wildcard DNS names allowing escape from permittedSubtrees (CVE-2026-69248) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

This security update for python-cryptography addresses three vulnerabilities: CVE-2026-69247, which involves a Bleichenbacher oracle exposure through distinguishable errors and timing in PKCS#7 EnvelopedData decryption; CVE-2026-69248, where the verifier accepts wildcard DNS names allowing escape from permittedSubtrees; and CVE-2026-69249, where duplicate self-signed intermediates can cause exponential path-building. These issues have been fixed in the updated python-cryptography package.

This update for python-cryptography fixes the following issues: - CVE-2026-69247: PKCS#7 `EnvelopedData` decryption exposes a Bleichenbacher oracle through distinguishable errors and timing (bsc#1273551). - CVE-2026-69248: verifier accepts wildcard DNS names allowing escape from `permittedSubtrees` (bsc#1273549). - CVE-2026-69249: duplicate self-signed intermediates can cause exponential path-building (bsc#1273516).

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.