CVE-2026-100890: NULL Pointer Dereference in Trusted Domain Project OpenDMARC
CVE-2026-100890 is a medium severity vulnerability in Trusted Domain Project OpenDMARC versions 1.4.0, 1.4.1, and 1.4.2. It involves a NULL pointer dereference in the SPF Parser component, specifically in the function opendmarc_spf_ipv6_explode. This flaw can be triggered remotely and has publicly available exploit code. The vendor has not responded to the disclosure, and no official patch or remediation guidance is currently available.
AI Analysis
Technical Summary
A NULL pointer dereference vulnerability exists in the Trusted Domain Project OpenDMARC SPF Parser component (libopendmarc/opendmarc_spf.c) in the function opendmarc_spf_ipv6_explode. Manipulation of the argument 'cp' can cause the application to dereference a NULL pointer, potentially leading to a denial of service. The vulnerability affects OpenDMARC versions 1.4.0, 1.4.1, and 1.4.2. Exploit code has been published, enabling remote attackers to trigger the flaw. The vendor was contacted but did not provide a response or patch.
Potential Impact
The vulnerability allows remote attackers to cause a NULL pointer dereference in OpenDMARC, which can lead to application crashes or denial of service. There is no indication of privilege escalation or data compromise from the provided information. Exploit code is publicly available, increasing the risk of exploitation.
Mitigation Recommendations
No official patch or remediation is currently available from the vendor. Users should monitor the vendor's communications for updates. Until a fix is released, consider implementing network-level protections to limit exposure of the OpenDMARC service to untrusted sources.
CVE-2026-100890: NULL Pointer Dereference in Trusted Domain Project OpenDMARC
Description
CVE-2026-100890 is a medium severity vulnerability in Trusted Domain Project OpenDMARC versions 1.4.0, 1.4.1, and 1.4.2. It involves a NULL pointer dereference in the SPF Parser component, specifically in the function opendmarc_spf_ipv6_explode. This flaw can be triggered remotely and has publicly available exploit code. The vendor has not responded to the disclosure, and no official patch or remediation guidance is currently available.
CVSS v4.0
Score 6.9medium
Affected software
Trusted Domain Project
OpenDMARC
pkg:deb/trusted_domain_project/opendmarccpe:2.3:a:trusted_domain_project:opendmarc:*:*:*:*:*:*:*:*Run on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
A NULL pointer dereference vulnerability exists in the Trusted Domain Project OpenDMARC SPF Parser component (libopendmarc/opendmarc_spf.c) in the function opendmarc_spf_ipv6_explode. Manipulation of the argument 'cp' can cause the application to dereference a NULL pointer, potentially leading to a denial of service. The vulnerability affects OpenDMARC versions 1.4.0, 1.4.1, and 1.4.2. Exploit code has been published, enabling remote attackers to trigger the flaw. The vendor was contacted but did not provide a response or patch.
Potential Impact
The vulnerability allows remote attackers to cause a NULL pointer dereference in OpenDMARC, which can lead to application crashes or denial of service. There is no indication of privilege escalation or data compromise from the provided information. Exploit code is publicly available, increasing the risk of exploitation.
Mitigation Recommendations
No official patch or remediation is currently available from the vendor. Users should monitor the vendor's communications for updates. Until a fix is released, consider implementing network-level protections to limit exposure of the OpenDMARC service to untrusted sources.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulDB
- Date Reserved
- 2026-09-27T07:55:10.374Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab9c994f7a7c54106f51d4f
Added to database: 09/28/2026, 01:57:40 UTC
Last enriched: 09/28/2026, 01:58:11 UTC
Last updated: 09/28/2026, 02:31:31 UTC
Views: 4
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.