A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. (CVE-2026-101281)
Description
A vulnerability exists in Trusted Domain Project OpenDMARC up to version 1.4.2 in the SPF Macro Handler component. The flaw is in the function opendmarc_sp2_find_mailfrom_domain, causing improper authentication. This vulnerability can be exploited remotely. An exploit has been published. A patch identified by commit c48a74c758677fc5272a73eff15ffdbf8afda1a6 is available and recommended to fix the issue.
CVSS v3.1
Score 7.3high
Affected software
pkg:deb/ubuntu/opendmarc?arch=source&distro=esm-apps/xenialpkg:deb/ubuntu/opendmarc?arch=source&distro=bionicpkg:deb/ubuntu/opendmarc?arch=source&distro=focalpkg:deb/ubuntu/opendmarc?arch=source&distro=jammypkg:deb/ubuntu/opendmarc?arch=source&distro=noblepkg:deb/ubuntu/opendmarc?arch=source&distro=stonkingpkg:deb/ubuntu/opendmarc?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-101281 describes a security flaw in OpenDMARC versions up to 1.4.2 affecting the SPF Macro Handler, specifically the opendmarc_sp2_find_mailfrom_domain function in libopendmarc/opendmarc_spf.c. The vulnerability leads to improper authentication, which can be exploited remotely. The vulnerability has a CVSS 3.1 score of 7.3, indicating a medium severity level with network attack vector, low attack complexity, no privileges or user interaction required, and impacts on confidentiality, integrity, and availability. A patch identified by commit c48a74c758677fc5272a73eff15ffdbf8afda1a6 is available to remediate this issue.
Potential Impact
The vulnerability allows remote attackers to cause improper authentication in OpenDMARC, potentially impacting confidentiality, integrity, and availability of the service. The CVSS score of 7.3 reflects a medium severity with network-based exploitation possible without privileges or user interaction.
Mitigation Recommendations
A patch is available for this vulnerability, identified by commit c48a74c758677fc5272a73eff15ffdbf8afda1a6. Applying this patch to affected OpenDMARC versions up to 1.4.2 is the recommended action to remediate the issue.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-101281
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:Pro:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad3f5022cdf04f656657bd5
Added to database: 10/17/2026, 22:21:54 UTC
Last enriched: 10/17/2026, 22:49:44 UTC
Last updated: 10/17/2026, 22:49:44 UTC
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.