Vulnerability in Trusted Domain Project Opendmarc
CVE-2026-101016
A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2. This affects the function opendmarc_policy_parse_dmarc in the library libopendmarc/opendmarc_policy.c. The manipulation of the argument fo/rf/ri/pct/sp/adkim/aspf/rua/ruf leads to handling of exceptional conditions. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
- Trusted Domain Project Opendmarc — versions 1.4.0, 1.4.1, 1.4.2
Weakness classification (CWE)
References
- vuldb.com/vuln/410886 (technical-description, vdb-entry)
- vuldb.com/vuln/410886/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-101016 (third-party-advisory)
- vuldb.com/submit/918242 (third-party-advisory)
- xuyongzhe-vt.github.io/share/opendmarc-bad-tag-drops-policy.html (exploit)
Frequently asked questions
- What is CVE-2026-101016?
- CVE-2026-101016 is a medium-severity vulnerability in Trusted Domain Project Opendmarc, classified under Improper Handling of Exceptional Conditions. CVSS score: 6.5/10. Published 2026-09-28.
- How severe is CVE-2026-101016?
- Medium severity. CVSS v3 base score is 6.5 out of 10.