---
title: "CVE-2026-101014: Trusted Domain Project OpenDMARC - Buffer Overflow"
description: "Trusted Domain Project OpenDMARC <= 1.4.2 contains a buffer overflow caused by an off-by-one error in opendmarc_util_cleanup function of DMARC Record Parser, letting remote attackers cause potential memory corruption, exploit requires crafted input."
url: https://panop.io/threat-heartbeat/CVE-2026-101014/
---

# CVE-2026-101014 Trusted Domain Project OpenDMARC - Buffer Overflow

Trusted Domain Project OpenDMARC <= 1.4.2 contains a buffer overflow caused by an off-by-one error in opendmarc\_util\_cleanup function of DMARC Record Parser, letting remote attackers cause potential memory corruption, exploit requires crafted input.

CVSS base score 7.3 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.31% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-101014)

## Details

Type

Buffer Overflow

Impact

Denial Of Service, Remote Code Execution

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

Published

28 September 2026

Updated

15 October 2026

Weakness

[CWE-189](https://cwe.mitre.org/data/definitions/189.html)

## Vendor fix

Apply the patch b3b1da9264bc80324094a27c71e7369bdedc62ae or update to the latest version.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-101014](https://nvd.nist.gov/vuln/detail/CVE-2026-101014)
- [https://github.com/trusteddomainproject/OpenDMARC/pull/344](https://github.com/trusteddomainproject/OpenDMARC/pull/344)
- [https://vuldb.com/cve/CVE-2026-101014](https://vuldb.com/cve/CVE-2026-101014)
- [https://vuldb.com/submit/917100](https://vuldb.com/submit/917100)
- [https://vuldb.com/vuln/410884](https://vuldb.com/vuln/410884)
- [https://vuldb.com/vuln/410884/cti](https://vuldb.com/vuln/410884/cti)
- [https://weitongli.com/share/opendmarc-cleanup-off-by-one.html](https://weitongli.com/share/opendmarc-cleanup-off-by-one.html)
- [https://github.com/trusteddomainproject/OpenDMARC/commit/b3b1da9264bc80324094a27c71e7369bdedc62ae](https://github.com/trusteddomainproject/OpenDMARC/commit/b3b1da9264bc80324094a27c71e7369bdedc62ae)
- [https://github.com/trusteddomainproject/OpenDMARC/pull/188](https://github.com/trusteddomainproject/OpenDMARC/pull/188)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

Panop answers these inside your environment, for this CVE and every other finding.

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