Description
OpenDMARC through 1.3.2 and 1.4.x allows attacks that inject authentication results to provide false information about the domain that originated an e-mail message. This is caused by incorrect parsing and interpretation of SPF/DKIM authentication results, as demonstrated by the example.net(.example.com substring.
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 | 1.4.0~beta1+dfsg-4 | — |
| Debian 13 | opendmarc | 1.4.0~beta1+dfsg-4 | — |
| Debian 12 | opendmarc | 1.4.0~beta1+dfsg-4 | — |
| Debian 10 | opendmarc | 1.3.2-6+deb10u3 | DLA-3546-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | opendmarc | 1.3.2-7ubuntu0.1 | USN-6356-1 |
| Ubuntu 18.04 LTS | opendmarc | 1.3.2-3ubuntu0.2 | USN-6356-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 16.04 LTS | opendmarc | 1.3.1+dfsg-3ubuntu0.1~esm1 | USN-6356-1 |
Advisories 2
- USN-6356-1 opendmarc vulnerabilities Ubuntu Security Notices (USN) · Jun 25, 2026
- DLA-3546-1 opendmarc - security update Debian Security (DSA / DLA) · Mar 9, 2026