A vulnerability was detected in Trusted Domain Project OpenDKIM up to 2.11.0. (CVE-2026-100889)
Description
A vulnerability exists in Trusted Domain Project OpenDKIM up to version 2.11.0 in the dkim_qp_decode function of util.c. This off-by-one error can be exploited remotely. Public exploit code is available. The vendor has not responded to the disclosure. The CVSS score is 7.3, indicating a medium severity issue.
CVSS v3.1
Score 7.3high
Affected software
pkg:deb/ubuntu/opendkim?arch=source&distro=xenialpkg:deb/ubuntu/opendkim?arch=source&distro=bionicpkg:deb/ubuntu/opendkim?arch=source&distro=focalpkg:deb/ubuntu/opendkim?arch=source&distro=jammypkg:deb/ubuntu/opendkim?arch=source&distro=noblepkg:deb/ubuntu/opendkim?arch=source&distro=stonkingpkg:deb/ubuntu/opendkim?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-100889 describes an off-by-one vulnerability in the dkim_qp_decode function within the util.c file of the Decoder component in Trusted Domain Project OpenDKIM versions up to 2.11.0. This flaw allows remote attackers to manipulate the decoding process, potentially leading to impacts on confidentiality, integrity, and availability. Public exploit code exists, but no vendor response or patch has been provided as of the publication date.
Potential Impact
The vulnerability can be exploited remotely without authentication, potentially leading to partial loss of confidentiality, integrity, and availability of the affected system. The CVSS 3.1 base score of 7.3 reflects these impacts. No confirmed active exploitation in the wild is reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Since the vendor has not responded and no patch links are available, users should monitor official channels for updates and consider mitigating exposure by restricting access to the OpenDKIM service until a fix is available.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-100889
- Osv Schema Version
- 1.7.0
- Ecosystems
- ["Ubuntu:16.04:LTS","Ubuntu:18.04:LTS","Ubuntu:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:26.10","Ubuntu:26.04:LTS"]
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 6ad3f5052cdf04f656657be2
Added to database: 10/17/2026, 22:21:57 UTC
Last enriched: 10/17/2026, 22:50:44 UTC
Last updated: 10/17/2026, 22:50:44 UTC
Views: 2
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.