Trusted Domain Project OpenDKIM Decoder util.c dkim_qp_decode off-by-one (CVE-2026-100889) | HOL Guard CVE

Medium · CVSS 6.9CVE-2026-100889

Trusted Domain Project OpenDKIM Decoder util.c dkim_qp_decode off-by-one

Answer in brief

CVE-2026-100889 records a Medium severity (CVSS 6.9) vulnerability in Trusted Domain Project OpenDKIM Decoder util.c dkim_qp_decode off-by-one. The current sources do not mark it as known exploited. The current feed maps Trusted Domain Project/OpenDKIM (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 27, 2026Updated Sep 27, 2026Source checked Sep 28, 2026First seen by HOL Sep 27, 2026Material review Sep 27, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 6.9
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 6.9. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Trusted Domain Project/OpenDKIM (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Trusted Domain Project/OpenDKIMgeneric	2.0 \|\| 2.1 \|\| 2.2 \|\| 2.3 \|\| 2.4 \|\| 2.5 \|\| 2.6 \|\| 2.7 \|\| 2.8 \|\| 2.9 \|\| 2.10 \|\| 2.11.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Trusted Domain Project/OpenDKIM.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 27, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 27, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.