CVE-2024-26134: 
Python vulnerability analysis and mitigation

CVE-2024-26134 affects cbor2, a Python library that provides encoding and decoding for the Concise Binary Object Representation (CBOR) (RFC 8949) serialization format. The vulnerability was discovered in versions starting from 5.5.1 and prior to version 5.6.2. The issue was disclosed on February 19, 2024, and a patch was released in version 5.6.2 (GitHub Advisory, NVD).

The vulnerability is a buffer overflow issue in the CBOR2 decoder that occurs when parsing CBOR binary data. The issue manifests when an attacker sends a long enough object to the decoder. The vulnerability has been assigned a CVSS v3.1 Base Score of 7.5 HIGH with vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. The vulnerability is classified as CWE-120 (Buffer Copy without Checking Size of Input) (NVD).

Successful exploitation of this vulnerability allows an attacker to crash a service using cbor2 to parse CBOR binary data by sending a long enough object. This can lead to denial of service conditions (GitHub Advisory).

Users should upgrade to cbor2 version 5.6.2 which contains the fix for this vulnerability. The patch has been released and is available through standard package managers. Fedora has released security updates for versions 38, 39, and 40 to address this vulnerability (Fedora Update).