# CVE-2026-101014: Trusted Domain Project OpenDMARC DMARC Record opendmarc_util.c opendmarc_util_cleanup off-by-one

> Remote attackers can trigger an off-by-one error in OpenDMARC's DMARC record parser, potentially causing crashes or arbitrary code execution.

- **Severity:** Medium 6.9 (`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`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 28 Sep 2026
- **Updated:** 28 Sep 2026
- **Also known as:** DEBIAN-CVE-2026-101014, GHSA-ccpv-xp3h-j99v, UBUNTU-CVE-2026-101014

## What is CVE-2026-101014?

CVE-2026-101014 is a medium-severity vulnerability in Trusted Domain Project OpenDMARC, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official 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.

Weakness: CWE-193 (Off-by-one Error), CWE-189

## Which versions are affected by CVE-2026-101014?


## How do I fix CVE-2026-101014?

No fix has been published for CVE-2026-101014 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-101014 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101014 exists.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-101014 and fix it if it is affected.

What it is: CVE-2026-101014 is a medium-severity vulnerability in Trusted Domain Project OpenDMARC, published on 28 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-101014 exists.

Affected product: Trusted Domain Project OpenDMARC. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-101014/ (Markdown: https://insights.sbomify.com/CVE-2026-101014/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-101014
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-101014
- OSV: https://osv.dev/vulnerability/CVE-2026-101014

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-101014/
Summaries are generated and may contain mistakes; the official description above is the record.