---
title: "CVE-2026-101281\n    | Ubuntu"
description: Ubuntu is an open source software operating system that runs from the
  desktop, to the cloud, to all your internet connected things.
url: https://ubuntu.com/security/CVE-2026-101281?format=md
keywords: index, follow
---

# CVE-2026-101281

Publication date 29 September 2026

Last updated 30 September 2026

---

Ubuntu priority

**Medium**

[Why this priority?](https://ubuntu.com/security/cves/about#priority )

## Cvss 3 Severity Score

**7.3 · High**

[Score breakdown](https://ubuntu.com/security/CVE-2026-101281?format=md#impact-score)

Toggle side navigation

## Description

A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2.
Affected by this vulnerability is the function
opendmarc\_sp2\_find\_mailfrom\_domain of the file libopendmarc/opendmarc\_spf.c
of the component SPF Macro Handler. This manipulation causes improper
authentication. The attack is possible to be carried out remotely. The
exploit has been published and may be used. Patch name:
c48a74c758677fc5272a73eff15ffdbf8afda1a6. Applying a patch is the
recommended action to fix this issue.

## Status

Show unmaintained releases

| Package | Ubuntu Release | Status |
| --- | --- | --- |
| opendmarc | 26.04 LTS resolute | Needs evaluation |
| 24.04 LTS noble | Needs evaluation |
| 22.04 LTS jammy | Needs evaluation |
| 20.04 LTS focal | Needs evaluation |
| 18.04 LTS bionic | Needs evaluation |
| 16.04 LTS xenial | Needs evaluation |

---

* [How can I get the fixes?](https://ubuntu.com/security/cves/about#security)
* [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses)

## Severity score breakdown

CVSS version:

CVSS v4.0

[CVSS v4.0](https://ubuntu.com/security/CVE-2026-101281?format=md)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-101281?format=md)

**Base score**

5.5 · Medium

* Base metrics

  | Parameter | Value |
  | --- | --- |
  | Attack vector | Network |
  | Attack complexity | Low |
  | Attack requirements | None |
  | Privileges required | None |
  | User interaction | None |
  | Vulnerable system - Confidentiality impact | Low |
  | Vulnerable system - Integrity impact | Low |
  | Vulnerable system - Availability impact | Low |
  | Subsequent system - Confidentiality impact | None |
  | Subsequent system - Integrity impact | None |
  | Subsequent system - Availability impact | None |
* Scores

  | Parameter | Value |
  | --- | --- |
  | Base score | 5.5 · Medium |
  | Base + Threat score | - |
  | Base + Environmental score | - |
  | Base + Threat + Environmental score | - |

**Vector:** CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-101281)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-101281)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-101281)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-101281)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-101281>
* <https://github.com/trusteddomainproject/OpenDMARC/commit/c48a74c758677fc5272a73eff15ffdbf8afda1a6>
* <https://github.com/trusteddomainproject/OpenDMARC/issues/262>
* <https://github.com/trusteddomainproject/OpenDMARC/pull/328>
* <https://vuldb.com/cve/CVE-2026-101281>
* <https://vuldb.com/submit/918284>
* <https://vuldb.com/vuln/411038>
* <https://vuldb.com/vuln/411038/cti>
* <https://xuyongzhe-vt.github.io/share/opendmarc-spf-postmaster-macro.html>