---
title: "CVE-2026-101016\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-2026-101016?format=md
keywords: index, follow
---

# CVE-2026-101016

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

**6.5 · Medium**

[Score breakdown](https://ubuntu.com/security/CVE-2026-101016?format=md#impact-score)

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## Description

A vulnerability has been found in Trusted Domain Project OpenDMARC up to
1.4.2. This affects the function opendmarc\_policy\_parse\_dmarc in the
library libopendmarc/opendmarc\_policy.c. The manipulation of the argument
fo/rf/ri/pct/sp/adkim/aspf/rua/ruf leads to handling of exceptional
conditions. Remote exploitation of the attack is possible. The exploit has
been disclosed to the public and may be used. The vendor was contacted
early about this disclosure but did not respond in any way.

## 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-2026-101016?format=md)
[CVSS v3.0](https://ubuntu.com/security/CVE-2026-101016?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 | None |
  | 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:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:P

## References

* [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-101016)
* [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-101016)
* [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-101016)
* [Debian](https://security-tracker.debian.org/tracker/CVE-2026-101016)

### Other references

* <https://www.cve.org/CVERecord?id=CVE-2026-101016>
* <https://xuyongzhe-vt.github.io/share/opendmarc-bad-tag-drops-policy.html>
* <https://vuldb.com/cve/CVE-2026-101016>
* <https://vuldb.com/submit/918242>
* <https://vuldb.com/vuln/410886>
* <https://vuldb.com/vuln/410886/cti>