A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this issue is the function opendmarc_policy_query_dmarc in the library libopendmarc/opendmarc_policy.c of the component Internationalized Domain Name Handler. Such manipulation leads to encoding error. It is possible to launch the attack remotely. 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.

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

Exploitation poc

Automatable yes

Technical Impact partial

Affected Vendors & Products

Vendors Products
Trusted Domain Project
  • Opendmarc

No data.

No data.

References
Link Providers
https://vuldb.com/cve/CVE-2026-100891 cve-icon cve-icon
https://vuldb.com/submit/917215 cve-icon cve-icon
https://vuldb.com/vuln/410841 cve-icon cve-icon
https://vuldb.com/vuln/410841/cti cve-icon cve-icon
https://weitongli.com/share/opendmarc-ulabel-not-converted.html cve-icon cve-icon
History

Thu, 01 Oct 2026 14:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Mon, 28 Sep 2026 00:45:00 +0000

Type Values Removed Values Added
Description A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this issue is the function opendmarc_policy_query_dmarc in the library libopendmarc/opendmarc_policy.c of the component Internationalized Domain Name Handler. Such manipulation leads to encoding error. It is possible to launch the attack remotely. 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.
Title Trusted Domain Project OpenDMARC Internationalized Domain Name opendmarc_policy.c opendmarc_policy_query_dmarc encoding error
First Time appeared Trusted Domain Project
Trusted Domain Project opendmarc
Weaknesses CWE-172
CPEs cpe:2.3:a:trusted_domain_project:opendmarc:*:*:*:*:*:*:*:*
Vendors & Products Trusted Domain Project
Trusted Domain Project opendmarc
References
Metrics cvssV2_0

{'score': 7.5, 'vector': 'AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:C'}

cvssV3_0

{'score': 7.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C'}

cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P'}
cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published: 2026-09-28T00:15:14.678Z

Updated: 2026-10-01T13:55:15.001Z

Reserved: 2026-09-27T07:55:14.732Z

Link: CVE-2026-100891

cve-icon Vulnrichment

Updated: 2026-10-01T13:55:08.617Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-09-28T01:16:28.367

Modified: 2026-10-01T14:17:11.020

Link: CVE-2026-100891

cve-icon Redhat

No data.