Source: python-ecdsa Version: 0.19.1-1 Severity: important Tags: security upstream X-Debbugs-Cc: [email protected], Debian Security Team <[email protected]>
Hi, The following vulnerability was published for python-ecdsa. CVE-2026-33936[0]: | 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. If you fix the vulnerability please also make sure to include the CVE (Common Vulnerabilities & Exposures) id in your changelog entry. For further information see: [0] https://security-tracker.debian.org/tracker/CVE-2026-33936 https://www.cve.org/CVERecord?id=CVE-2026-33936 [1] https://github.com/tlsfuzzer/python-ecdsa/security/advisories/GHSA-9f5j-8jwj-x28g [2] https://github.com/tlsfuzzer/python-ecdsa/commit/bd66899550d7185939bf27b75713a2ac9325a9d3 Please adjust the affected versions in the BTS as needed. Regards, Salvatore
