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CVE-2026-100890— Trusted Domain Project OpenDMARC SPF Parser opendmarc_spf.c opendmarc_spf_ipv6_explode null pointer dereference

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（最高至 1.4.2 版本）中发现了一个漏洞。受影响的组件是 SPF 解析器（SPF Parser）中的库 libopendmarc/opendmarc_spf.c 的函数 opendmarc_spf_ipv6_explode。对该参数 cp 的操作会导致空指针解引用。该漏洞可以远程利用，目前已有公开的利用代码，可能被攻击者使用。供应商已早期收到此次漏洞披露通知，但至今未作任何回应。

CVSS 5.3 · Medium

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-100890

Vulnerability Information
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Vulnerability Title
Trusted Domain Project OpenDMARC SPF Parser opendmarc_spf.c opendmarc_spf_ipv6_explode null pointer dereference
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_spf_ipv6_explode in the library libopendmarc/opendmarc_spf.c of the component SPF Parser. This manipulation of the argument cp causes null pointer dereference. It is possible to initiate the attack remotely. The exploit has been published 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:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
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-2026-100890

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III. Intelligence Information for CVE-2026-100890

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Security Blog Posts for CVE-2026-100890 (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-2026-100891 7.3 HIGH Trusted Domain Project OpenDMARC Internationalized Domain Name opendmarc_policy.c opendmar
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

IV. Related Vulnerabilities

Same product: OpenDMARC
Same vendor: Trusted Domain Project
Same weakness: CWE-476

V. Comments for CVE-2026-100890

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