CVE-2024-26134: Agronholm CBOR2

High severity, CVSS 7.5. EPSS: 1.2% chance of exploitation in the next 30 days.

cbor2 provides encoding and decoding for the Concise Binary Object Representation (CBOR) (RFC 8949) serialization format. Starting in version 5.5.1 and prior to version 5.6.2, an attacker can crash a service using cbor2 to parse a CBOR binary by sending a long enough object. Version 5.6.2 contains a patch for this issue.

Affected products

• Agronholm CBOR2: from 5.5.1, before 5.6.2 (fixed in 5.6.2)
• Fedoraproject Fedora: version 38 only; version 39 only; version 40 only

Published 2024-02-19. Last modified 2026-06-17.