A vulnerability was detected in Trusted Domain Project OpenDKIM up to 2.11.0. Affected is the function dkim_qp_decode of the file util.c of the component Decoder. The manipulation results in off-by-one. The attack may be performed from remote. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact Low

Vulnerable System Integrity Impact Low

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Attack Vector Network

Attack Complexity Low

Privileges Required None

Scope Unchanged

Confidentiality Impact Low

Integrity Impact Low

Availability Impact Low

User Interaction None

Access Vector Network

Access Complexity Low

Authentication None

Confidentiality Impact Partial

Integrity Impact Partial

Availability Impact Partial

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Trusted Domain Project OpenDKIM affected
Version Status Constraints
2.0 affected —
2.1 affected —
2.2 affected —
2.3 affected —
2.4 affected —
2.5 affected —
2.6 affected —
2.7 affected —
2.8 affected —
2.9 affected —
2.10 affected —
2.11.0 affected —

No data.

No data.

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Vendors Products
Trusted Domain Project Subscribe
Opendkim Subscribe

Project Subscriptions

Vendors Products
Trusted Domain Project Subscribe
Opendkim Subscribe
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://vuldb.com/cve/CVE-2026-100889 cve-icon cve-icon
https://vuldb.com/submit/917063 cve-icon cve-icon
https://vuldb.com/vuln/410839 cve-icon cve-icon
https://vuldb.com/vuln/410839/cti cve-icon cve-icon
https://weitongli.com/share/opendkim-qp-off-by-one.html cve-icon cve-icon
History

Mon, 28 Sep 2026 00:00:00 +0000

Type Values Removed Values Added
Description A vulnerability was detected in Trusted Domain Project OpenDKIM up to 2.11.0. Affected is the function dkim_qp_decode of the file util.c of the component Decoder. The manipulation results in off-by-one. The attack may be performed from remote. The exploit is now public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
Title Trusted Domain Project OpenDKIM Decoder util.c dkim_qp_decode off-by-one
First Time appeared Trusted Domain Project
Trusted Domain Project opendkim
Weaknesses CWE-189
CWE-193
CPEs cpe:2.3:a:trusted_domain_project:opendkim:*:*:*:*:*:*:*:*
Vendors & Products Trusted Domain Project
Trusted Domain Project opendkim
References
Metrics cvssV2_0

{'score': 7.5, 'vector': 'AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:ND/RC:C'}

cvssV3_0

{'score': 7.3, 'vector': 'CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C'}

cvssV3_1

{'score': 7.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:C'}

cvssV4_0

{'score': 6.9, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulDB

Published:

Updated: 2026-09-27T23:45:16.286Z

Reserved: 2026-09-27T07:35:55.983Z

Link: CVE-2026-100889

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-28T00:16:32.647

Modified: 2026-09-28T00:16:32.647

Link: CVE-2026-100889

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-09-28T01:30:06Z

Weaknesses