Vulnerability in Trusted Domain Project Opendmarc
CVE-2026-101017
A vulnerability was found in Trusted Domain Project OpenDMARC up to 1.4.2. This vulnerability affects the function strcasecmp in the library libopendmarc/opendmarc_policy.c. The manipulation results in handling of exceptional conditions. The attack can be executed remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.
Published .
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/cve/CVE-2026-101017 (third-party-advisory)
- vuldb.com/submit/918247 (third-party-advisory)
- vuldb.com/vuln/410887 (technical-description, vdb-entry)
- vuldb.com/vuln/410887/cti (signature, permissions-required)
- xuyongzhe-vt.github.io/share/opendmarc-subdomain-walk-abort.html (exploit)
Frequently asked questions
- What is CVE-2026-101017?
- CVE-2026-101017 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-2026-101017?
- Medium severity. CVSS v3 base score is 6.5 out of 10.