Bug 2418103

Summary: CVE-2025-64076 python-cbor2: cbor2: Integer Underflow and Memory Leak leading to Denial of Service [epel-8]
Product: [Fedora] Fedora EPEL Reporter: Praise Ogwuche <pogwuche>
Component: python-cbor2Assignee: Carl George 🤠 <carlwgeorge>
Status: CLOSED NOTABUG QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: epel8CC: carl, python-packagers-sig
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["baada591-dbb9-4e1a-b074-67ea541acfee"]}
Fixed In Version: Doc Type: ---
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2026-04-10 23:18:44 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 2415716    

Description Praise Ogwuche 2025-12-01 20:49:54 UTC 
Disclaimer: Community trackers are created by Red Hat Product Security team on a best effort basis. Package maintainers are required to ascertain if the flaw indeed affects their package, before starting the update process.

The following link provides references to all essential vulnerability management information. If something is wrong or missing, please contact a member of PSIRT.
https://spaces.redhat.com/display/PRODSEC/Vulnerability+Management+-+Essential+Documents+for+Engineering+Teams
Comment 1 Fedora Admin user for bugzilla script actions 2026-04-02 13:20:26 UTC 
This package has changed maintainer in Fedora. Reassigning to the new maintainer of this component.
Comment 2 Carl George 🤠 2026-04-10 23:18:44 UTC 
The affected function (decode_definite_long_string) was first introduced in version 5.6.0.

https://github.com/agronholm/cbor2/commit/387755eacf0be35591a478d3c67fe10618a6d542

EPEL 8 has version 5.1.2 and thus is not affected.