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CVE-2026-100891— Trusted Domain Project OpenDMARC Internationalized Domain Name opendmarc_policy.c opendmarc_policy_query_dmarc encoding error

Quick assessment

Affected
Trusted Domain Project OpenDMARC
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 OpenDMARC 1.4.2 及更早版本中发现了一个漏洞。该问题影响组件“国际化域名处理程序”（Internationalized Domain Name Handler）中 libopendmarc/opendmarc_policy.c 库里的 opendmarc_policy_query_dmarc 函数。此类操作会导致编码错误。攻击者可远程发起攻击。该漏洞的利用方式已向公众披露，且可被实际利用。尽管厂商在漏洞公开前较早已被联系，但并未作出任何回应。

CVSS 7.3 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-100891

Vulnerability Information
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Vulnerability Title
Trusted Domain Project OpenDMARC Internationalized Domain Name opendmarc_policy.c opendmarc_policy_query_dmarc encoding error
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this issue is the function opendmarc_policy_query_dmarc in the library libopendmarc/opendmarc_policy.c of the component Internationalized Domain Name Handler. Such manipulation leads to encoding error. It is possible to launch the attack remotely. The exploit has been disclosed to the 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
编码错误
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Trusted Domain Project OpenDMARC 1.4.0 cpe:2.3:a:trusted_domain_project:opendmarc:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-100891

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III. Intelligence Information for CVE-2026-100891

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Security Blog Posts for CVE-2026-100891 (1)

Other References for CVE-2026-100891 (1)

Same Patch Batch · Trusted Domain Project · 2026-09-28 · 7 CVEs total

CVE-2026-101014 7.3 HIGH Trusted Domain Project OpenDMARC DMARC Record opendmarc_util.c opendmarc_util_cleanup off-
CVE-2026-101015 7.3 HIGH Trusted Domain Project OpenDMARC policy.c improper validation of unsafe equivalence in inp
CVE-2026-101016 6.5 MEDIUM Trusted Domain Project OpenDMARC opendmarc_policy.c opendmarc_policy_parse_dmarc exception
CVE-2026-101017 6.5 MEDIUM Trusted Domain Project OpenDMARC opendmarc_policy.c strcasecmp exceptional condition
CVE-2026-100895 5.3 MEDIUM Trusted Domain Project OpenARC libopenarc arc-canon.c arc_parse_canon_t null pointer deref
CVE-2026-100890 5.3 MEDIUM Trusted Domain Project OpenDMARC SPF Parser opendmarc_spf.c opendmarc_spf_ipv6_explode nul

IV. Related Vulnerabilities

Same product: OpenDMARC
Same vendor: Trusted Domain Project
Same weakness: CWE-172

V. Comments for CVE-2026-100891

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