Is CVE-2026-101279 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-101279 being exploited in the wild.

How severe is CVE-2026-101279?

Medium severity, with a CVSS score of 6.5, published 29 September 2026.

Which products and versions are affected?

Trusted Domain Project OpenDMARC up to 1.4.2.

Is there a fix for CVE-2026-101279?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-101279 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-101279?

Check whether you run Trusted Domain Project OpenDMARC at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-101279: Trusted Domain Project OpenDMARC integer overflow in DMARC parser

CVE-2026-101279 · Severity: medium · CVSS 6.5 · Published 2026-09-29

OpenDMARC is an open-source implementation of DMARC (Domain-based Message Authentication, Reporting and Conformance) that validates email authentication. An integer overflow vulnerability in the DMARC parser can allow remote attackers to trigger unexpected behavior or denial of service when processing malicious email messages. The vulnerability affects OpenDMARC versions up to 1.4.2 and has been publicly disclosed.

Technologies: Trusted Domain Project OpenDMARC. Vendors: Trusted Domain Project.

Quick answers

Is CVE-2026-101279 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-101279 being exploited in the wild.
How severe is CVE-2026-101279?: Medium severity, with a CVSS score of 6.5, published 29 September 2026.
Which products and versions are affected?: Trusted Domain Project OpenDMARC up to 1.4.2.
Is there a fix for CVE-2026-101279?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-101279 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-101279?: Check whether you run Trusted Domain Project OpenDMARC at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

The vulnerability is an integer overflow in the DMARC Parser component (libopendmarc/opendmarc_policy.c), triggered through manipulation of the pct argument. Remote attackers can exploit this via network vectors to cause integer overflow, potentially leading to memory corruption or denial of service. No vendor patch has been confirmed as the vendor did not respond to early disclosure.

Affected products

Trusted Domain Project OpenDMARC up to 1.4.2

Timeline

2026-09-29: disclosed

References

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