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CVE-2026-100889— Trusted Domain Project OpenDKIM Decoder util.c dkim_qp_decode off-by-one

Quick assessment

Affected
Trusted Domain Project OpenDKIM
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Trusted Domain Project OpenDKIM 2.11.0 及更早版本中发现了一个安全漏洞。该漏洞存在于组件 Decoder 中的 util.c 文件的 dkim_qp_decode 函数里。此漏洞可导致“off-by-one”（差一）错误，攻击者可以从远程利用该漏洞进行攻击。目前该漏洞的利用代码已公开，可被恶意使用。供应商在早期已被联系告知此漏洞披露情况，但未作出任何回应。

CVSS 7.3 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-100889

Vulnerability Information
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Vulnerability Title
Trusted Domain Project OpenDKIM Decoder util.c dkim_qp_decode off-by-one
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
Off-by-one错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Trusted Domain Project OpenDKIM 2.0 cpe:2.3:a:trusted_domain_project:opendkim:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-100889

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III. Intelligence Information for CVE-2026-100889

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Security Blog Posts for CVE-2026-100889 (1)

IV. Related Vulnerabilities

Same product: OpenDKIM
Same vendor: Trusted Domain Project
Same weakness: CWE-193

V. Comments for CVE-2026-100889

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