CVE-2026-101281 PUBLISHED

A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_sp2_find_mailfrom_domain of the file libopendmarc/opendmarc_spf.c of the component SPF Macro Handler. This manipulation causes improper authentication. The attack is possible to be carried out remotely. The exploit has been published and may be used. Patch name: c48a74c758677fc5272a73eff15ffdbf8afda1a6. Applying a patch is the recommended action to fix this issue.

• yongzhe_xu (VulDB User) reporter

• VDB-411038 | Trusted Domain Project OpenDMARC SPF Macro opendmarc_spf.c opendmarc_sp2_find_mailfrom_domain improper authentication
• VDB-411038 | CTI Indicators (IOB, IOC, IOA)
• CVE-2026-101281 | CVE Analysis and Report
• Submit #918284 | The Trusted Domain Project OpenDMARC 1.4.2 Improper Authentication
• https://github.com/trusteddomainproject/OpenDMARC/issues/262
• https://github.com/trusteddomainproject/OpenDMARC/pull/328
• https://xuyongzhe-vt.github.io/share/opendmarc-spf-postmaster-macro.html
• https://github.com/trusteddomainproject/OpenDMARC/commit/c48a74c758677fc5272a73eff15ffdbf8afda1a6

• Improper Authentication CWE