CVE-2026-100891
Trusted Domain Project OpenDMARC Internationalized Domain Name opendmarc_policy.c opendmarc_policy_query_dmarc encoding error
- State
- Published
- Severity
- 6.9 Medium
- Published
- Sep 28, 2026
- Updated
- Oct 1, 2026
- Reserved
- Sep 27, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 6.9 Medium | 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 | VulDB |
| 3.1 | 7.3 High | 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 | VulDB |
| 3.0 | 7.3 High | 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 | VulDB |
| 2.0 | 7.5 High | AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:C | VulDB |
Weaknesses
- CWE-172 Encoding Error
Affected Products
| Product | Versions |
|---|---|
OpenDMARCTrusted Domain Project |
|
References
- VDB-410841 | Trusted Domain Project OpenDMARC Internationalized Domain Name opendmarc_policy.c opendmarc_policy_query_dmarc encoding errorvdb-entrytechnical-description
- VDB-410841 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- CVE-2026-100891 | CVE Analysis and Reportthird-party-advisory
- Submit #917215 | The Trusted Domain Project OpenDMARC 1.4.2 Improper Authenticationthird-party-advisory
- https://weitongli.com/share/opendmarc-ulabel-not-converted.htmlexploit
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