Description
OpenDMARC through 1.3.2 and 1.4.x through 1.4.0-Beta1 is prone to a signature-bypass vulnerability with multiple From: addresses, which might affect applications that consider a domain name to be relevant to the origin of an e-mail message.
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 | 1.3.2-7 | — |
| Debian 13 | opendmarc | 1.3.2-7 | — |
| Debian 12 | opendmarc | 1.3.2-7 | — |
| Debian 10 | opendmarc | 1.3.2-6+deb10u1 | DSA-4526-1 |
| Debian 9 | opendmarc | 1.3.2-2+deb9u2 | DSA-4526-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 18.04 LTS | opendmarc | 1.3.2-3ubuntu0.1 | USN-4567-1 |
Advisories 2
- USN-4567-1 opendmarc vulnerability Ubuntu Security Notices (USN) · Apr 22, 2026
- DSA-4526-1 opendmarc - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://github.com/trusteddomainproject/OpenDMARC/pull/48
- https://bugs.debian.org/940081
- https://www.openwall.com/lists/oss-security/2019/09/11/8
- [oss-security] 20190917 Re: OpenDMARC signature bypass with multiple From addresses mailing-list
- DSA-4526 vendor-advisory
- 20190920 [SECURITY] [DSA 4526-1] opendmarc security update mailing-list
- FEDORA-2019-e1f0417a24 vendor-advisory
- FEDORA-2019-24b3f84f6e vendor-advisory
- FEDORA-2019-6a2ca74e55 vendor-advisory
- USN-4567-1 vendor-advisory