Improper Input Validation in Trusted Domain Project OpenDMARC 1.4.2
CVE-2026-101015

6.9MEDIUM

Key Information:

Vendor

Trusted Domain Project

Status
Opendmarc
Vendor
CVE Published:
28 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-101015?

A vulnerability has been identified in the Trusted Domain Project OpenDMARC up to version 1.4.2, where improper validation of unsafe equivalence in input is present in the file policy.c of the Domain Handler component. This flaw may allow remote attackers to exploit this issue by executing a manipulation, potentially compromising system integrity. The exploit has been published, indicating a heightened risk for affected installations. Early outreach to the vendor regarding this vulnerability went unanswered, emphasizing the need for immediate attention from users of the affected product.

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-2026-101015 - Proof of Concept

References

https://vuldb.com/vuln/410885
vdb-entry
https://vuldb.com/vuln/410885/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-101015
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)
VulDB CNA Team
.