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{"bugzilla": {"description": "python-ecdsa: ecdsa: Denial of Service via crafted DER input", "id": "2452539", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2452539"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-130", "details": ["The `ecdsa` PyPI package is a pure Python implementation of ECC (Elliptic Curve Cryptography) with support for ECDSA (Elliptic Curve Digital Signature Algorithm), EdDSA (Edwards-curve Digital Signature Algorithm) and ECDH (Elliptic Curve Diffie-Hellman). Prior to version 0.19.2, an issue in the low-level DER parsing functions can cause unexpected exceptions to be raised from the public API functions. `ecdsa.der.remove_octet_string()` accepts truncated DER where the encoded length exceeds the available buffer. For example, an OCTET STRING that declares a length of 4096 bytes but provides only 3 bytes is parsed successfully instead of being rejected. Because of that, a crafted DER input can cause `SigningKey.from_der()` to raise an internal exception (`IndexError: index out of bounds on dimension 1`) rather than cleanly rejecting malformed DER (e.g., raising `UnexpectedDER` or `ValueError`). Applications that parse untrusted DER private keys may crash if they do not handle unexpected exceptions, resulting in a denial of service. Version 0.19.2 patches the issue.", "A flaw was found in the `ecdsa` Python package, which is used for cryptographic operations. A remote attacker can exploit this vulnerability by sending a specially crafted data input, known as Distinguished Encoding Rules (DER). This malformed input can cause applications that process untrusted cryptographic keys to crash, leading to a denial of service."], "name": "CVE-2026-33936", "package_state": [{"cpe": "cpe:/a:redhat:ansible_automation_platform:2", "fix_state": "Out of support scope", "package_name": "python-ecdsa", "product_name": "Red Hat Ansible Automation Platform 2"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "python-ecdsa", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "satellite-capsule:el8/python-ecdsa", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:rhui:4::el8", "fix_state": "Out of support scope", "package_name": "python-ecdsa", "product_name": "Red Hat Update Infrastructure 4 for Cloud Providers"}], "public_date": "2026-03-27T22:08:22Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-33936\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-33936\nhttps://github.com/tlsfuzzer/python-ecdsa/commit/bd66899550d7185939bf27b75713a2ac9325a9d3\nhttps://github.com/tlsfuzzer/python-ecdsa/releases/tag/python-ecdsa-0.19.2\nhttps://github.com/tlsfuzzer/python-ecdsa/security/advisories/GHSA-9f5j-8jwj-x28g"], "threat_severity": "Moderate"}