CVE-2026-100890
CVE-2026-100890
A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_spf_ipv6_explode in the library libopendmarc/opendmarc_spf.c of the component SPF Parser. This manipulation of the argument cp causes null pointer dereference. It is possible to initiate the attack 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.
Published .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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.
Weakness classification (CWE)
References
- vuldb.com/vuln/410840 (technical-description, vdb-entry)
- vuldb.com/vuln/410840/cti (signature, permissions-required)
- vuldb.com/cve/CVE-2026-100890 (third-party-advisory)
- vuldb.com/submit/917188 (third-party-advisory)
- weitongli.com/share/opendmarc-ip6-wild-pointer.html (exploit)
Frequently asked questions
- What is CVE-2026-100890?
- CVE-2026-100890 is a medium-severity vulnerability, classified under Improper Resource Shutdown or Release. CVSS score: 5.3/10. Published 2026-09-28.
- How severe is CVE-2026-100890?
- Medium severity. CVSS v3 base score is 5.3 out of 10.