Reference page — cumulative record through Saturday, October 3, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-100889

CVE-2026-100889MEDIUM

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

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   N   L   N   N   N   L   L   L    5.5   .0030   20.6     —

AFFECTED
  Product   Versions  Fixed
  OpenDKIM  2.0 –     —

TIMELINE
  Sep 27  Reserved by VulDB
  Sep 27  Published (CNA: VulDB)
  Sep 28  EXPLOIT PUBLISHED — CVE-2026-100889 (Trusted Domain Project OpenDKIM). Public exploit reference added.
  Sep 28  RESCORED — CVE-2026-100889 (Trusted Domain Project OpenDKIM). CVSS 6.9 → 5.5 (NVD).

CWE-189, CWE-193 · CNA: VulDB · CVSS v4.0 · 5 references · NVD status: Deferred

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.

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
September 27, 2026	Reserved	Reserved by VulDB
September 27, 2026	Published	Published (CNA: VulDB)
September 28, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-100889 (Trusted Domain Project OpenDKIM). Public exploit reference added.
September 28, 2026	RESCORED	RESCORED — CVE-2026-100889 (Trusted Domain Project OpenDKIM). CVSS 6.9 → 5.5 (NVD).

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
Trusted Domain Project	OpenDKIM	—	2.0	—

Weaknesses

CWE-189 · CWE-193

References (5)

Authoritative record: CVE-2026-100889 at cve.org

Vendors: trusted domain project

Weaknesses: CWE-189 · CWE-193

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-100889 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Saturday, October 3, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.