---
title: "CVE-2026-100889: Trusted Domain Project OpenDKIM - Buffer Overflow"
description: "Trusted Domain Project OpenDKIM <= 2.11.0 contains an off-by-one vulnerability caused by improper handling in dkim_qp_decode function in Decoder component, letting remote attackers potentially cause memory corruption, exploit requires crafted input."
url: https://panop.io/threat-heartbeat/CVE-2026-100889/
---

# CVE-2026-100889 Trusted Domain Project OpenDKIM - Buffer Overflow

Trusted Domain Project OpenDKIM <= 2.11.0 contains an off-by-one vulnerability caused by improper handling in dkim\_qp\_decode function in Decoder component, letting remote attackers potentially cause 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

0.30% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-100889)

## Details

Type

Buffer Overflow

Impact

Denial Of Service

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

Update to the latest version beyond 2.11.0.

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-2026-100889](https://nvd.nist.gov/vuln/detail/CVE-2026-100889)
- [https://vuldb.com/cve/CVE-2026-100889](https://vuldb.com/cve/CVE-2026-100889)
- [https://vuldb.com/submit/917063](https://vuldb.com/submit/917063)
- [https://vuldb.com/vuln/410839](https://vuldb.com/vuln/410839)
- [https://vuldb.com/vuln/410839/cti](https://vuldb.com/vuln/410839/cti)
- [https://weitongli.com/share/opendkim-qp-off-by-one.html](https://weitongli.com/share/opendkim-qp-off-by-one.html)

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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

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