Off-by-One Vulnerability in Trusted Domain Project OpenDMARC Product
CVE-2026-101014

6.9MEDIUM

Key Information:

Vendor

Trusted Domain Project

Status
Opendmarc
Vendor
CVE Published:
28 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-101014?

A vulnerability has been identified in the Trusted Domain Project OpenDMARC software, specifically in the opendmarc_util_cleanup function within the DMARC Record Parser. This off-by-one flaw allows for potential manipulation leading to unauthorized actions. The issue can be triggered remotely, making it crucial for users to apply the provided patch, identified by commit b3b1da9264bc80324094a27c71e7369bdedc62ae, to mitigate risks. With the exploit currently available publicly, timely action is recommended to secure your systems.

Affected Version(s)

OpenDMARC 1.4.0

OpenDMARC 1.4.1

OpenDMARC 1.4.2

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-101014 - Proof of Concept

References

https://vuldb.com/vuln/410884
vdb-entrytechnical-description
https://vuldb.com/vuln/410884/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-101014
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

WeitongLi (VulDB User)
.