CVE-2026-101017

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{"bugzilla": {"description": "opendmarc: OpenDMARC: Denial of Service via NULL pointer dereference during subdomain walking in opendmarc_policy.c", "id": "2542380", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2542380"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L", "status": "draft"}, "cwe": "CWE-476", "details": ["A flaw was found in OpenDMARC. A NULL pointer dereference occurs in the strcasecmp call within libopendmarc/opendmarc_policy.c during subdomain walking when processing Domain-based Message Authentication, Reporting, and Conformance (DMARC) records. A remote attacker could exploit this flaw by sending a specially crafted email that triggers the subdomain walking code path, potentially causing the OpenDMARC milter process to crash, resulting in a denial of service (DoS)."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-101017", "public_date": "2026-09-28T09:00:10Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-101017\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-101017\nhttps://vuldb.com/cve/CVE-2026-101017\nhttps://vuldb.com/submit/918247\nhttps://vuldb.com/vuln/410887\nhttps://vuldb.com/vuln/410887/cti\nhttps://xuyongzhe-vt.github.io/share/opendmarc-subdomain-walk-abort.html"], "statement": "OpenDMARC is not shipped in any Red Hat product. It is available only in Fedora and EPEL community repositories.", "threat_severity": "Moderate"}

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