Bug 2542428

Summary: CVE-2026-101015 opendmarc: OpenDMARC: DMARC policy bypass via Unicode dot character equivalence in policy.c Domain Handler [fedora-all]
Product: [Fedora] Fedora Reporter: Laura Pardo <lpardo>
Component: opendmarcAssignee: Kevin Fenzi <kevin>
Status: NEW --- QA Contact: Fedora Extras Quality Assurance <extras-qa>
Severity: high Docs Contact:
Priority: high    
Version: rawhideCC: abo, kevin, mikel
Target Milestone: ---Keywords: Security, SecurityTracking
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard: {"flaws": ["ee3d2a4d-fb2d-4d12-bb68-f79725c7af2a"]}
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Bug Depends On:    
Bug Blocks: 2542363    

Description Laura Pardo 2026-09-28 11:10:26 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.

A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this issue is some unknown functionality of the file policy.c of the component Domain Handler. Executing a manipulation can lead to improper validation of unsafe equivalence in input. The attack may be launched remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.