Is CVE-2026-101281 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-101281 being exploited in the wild.

How severe is CVE-2026-101281?

High severity, with a CVSS score of 7.3, 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-2026-101281?

A patch was published on 2026-09-29: Patch c48a74c758677fc5272a73eff15ffdbf8afda1a6 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-101281 attacked?

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

Am I affected by CVE-2026-101281?

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-2026-101281: OpenDMARC improper authentication in SPF macro handler

CVE-2026-101281 · Severity: high · CVSS 7.3 · Published 2026-09-29

OpenDMARC is a library that validates email authentication standards (DMARC and SPF) to prevent email spoofing. A flaw in the SPF macro handling function allows an attacker to bypass authentication checks remotely. This could enable email spoofing and allow malicious emails to pass authentication validation.

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

Quick answers

Is CVE-2026-101281 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-101281 being exploited in the wild.
How severe is CVE-2026-101281?: High severity, with a CVSS score of 7.3, 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-2026-101281?: A patch was published on 2026-09-29: Patch c48a74c758677fc5272a73eff15ffdbf8afda1a6 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-101281 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-101281?: 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 opendmarc_sp2_find_mailfrom_domain function in libopendmarc/opendmarc_spf.c has improper handling of SPF macros, allowing authentication bypass through remote network attack. The vulnerability stems from incorrect macro substitution in SPF record processing. A patch (c48a74c758677fc5272a73eff15ffdbf8afda1a6) addresses the issue by fixing the ordering of environment variable setup for HELO and MAIL FROM domains.

Affected products

Trusted Domain Project OpenDMARC up to 1.4.2

Timeline

2026-09-29: disclosed
2026-09-29: patched: Patch c48a74c758677fc5272a73eff15ffdbf8afda1a6

References

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