Security Flaw in Trusted Domain Project OpenDKIM Tag Tokenizer Affects Remote Access
CVE-2026-101277

6.9MEDIUM

Key Information:

Vendor

Trusted Domain Project

Status
Opendkim
Vendor
CVE Published:
28 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-101277?

A security vulnerability has been identified in the Trusted Domain Project OpenDKIM, specifically in the Tag Tokenizer component. The flaw resides within the dkim_process_set function in the dkim.c file, allowing attackers to manipulate the system into utilizing less trusted sources. This vulnerability can be exploited remotely, raising significant concerns for users and systems relying on OpenDKIM. The issue has been publicly disclosed, and despite early contact with the vendor regarding this flaw, there has been no follow-up or response.

Affected Version(s)

OpenDKIM 2.0

OpenDKIM 2.1

OpenDKIM 2.2

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-2026-101277 - Proof of Concept

References

https://vuldb.com/vuln/411034
vdb-entrytechnical-description
https://vuldb.com/vuln/411034/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-101277
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
None
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

yongzhe_xu (VulDB User)
VulDB CNA Team
.