Description
A vulnerability was detected in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_util_cleanup in the library libopendmarc/opendmarc_util.c of the component DMARC Record Parser. Performing a manipulation results in off-by-one. The attack may be initiated remotely. The exploit is now public and may be used. The patch is named b3b1da9264bc80324094a27c71e7369bdedc62ae. To fix this issue, it is recommended to deploy a patch.
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-410884 | Trusted Domain Project OpenDMARC DMARC Record opendmarc_util.c opendmarc_util_cleanup off-by-one vdb-entry technical-description
- VDB-410884 | CTI Indicators (IOB, IOC, IOA) signature permissions-required
- CVE-2026-101014 | CVE Analysis and Report third-party-advisory
- Submit #917100 | The Trusted Domain Project OpenDMARC 1.4.2 Out-of-Bounds Read third-party-advisory
- https://github.com/trusteddomainproject/OpenDMARC/pull/188 issue-tracking patch
- https://github.com/trusteddomainproject/OpenDMARC/pull/344 issue-tracking patch
- https://weitongli.com/share/opendmarc-cleanup-off-by-one.html exploit
- https://github.com/trusteddomainproject/OpenDMARC/commit/b3b1da9264bc80324094a27c71e7369bdedc62ae patch