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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Trusted Domain Project | OpenDMARC | 1.4.0, 1.4.1, 1.4.2 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | opendmarc | No fix yet | — |
| Debian 13 | opendmarc | No fix yet | — |
| Debian 12 | opendmarc | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | opendmarc | No fix yet | — |
| Ubuntu 26.04 LTS | opendmarc | No fix yet | — |
| Ubuntu 24.04 LTS | opendmarc | No fix yet | — |
| Ubuntu 22.04 LTS | opendmarc | No fix yet | — |
| Ubuntu 20.04 LTS | opendmarc | No fix yet | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | opendmarc | No fix yet | — |
| Ubuntu Pro 16.04 LTS | opendmarc | No fix yet | — |
References
- VDB-410841 | Trusted Domain Project OpenDMARC Internationalized Domain Name opendmarc_policy.c opendmarc_policy_query_dmarc encoding error vdb-entry technical-description
- VDB-410841 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- CVE-2026-100891 | CVE Analysis and Report third-party-advisory
- Submit #917215 | The Trusted Domain Project OpenDMARC 1.4.2 Improper Authentication third-party-advisory
- https://weitongli.com/share/opendmarc-ulabel-not-converted.html exploit