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CVE-2026-101014— Trusted Domain Project OpenDMARC DMARC Record opendmarc_util.c opendmarc_util_cleanup off-by-one

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 的 OpenDMARC 1.4.2 及更早版本中检测到一处漏洞。受该漏洞影响的是 DMARC 记录解析器组件中 libopendmarc/opendmarc_util.c 文件里的 opendmarc_util_cleanup 函数。对该函数的不当操作会导致缓冲区溢出/下溢（off-by-one 错误）。攻击者可远程发起攻击。目前相关利用代码已公开，可能被恶意利用。修复该漏洞的补丁为 b3b1da9264bc80324094a27c71e7369bdedc62ae。

CVSS 7.3 · High

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-101014

Vulnerability Information
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Vulnerability Title
Trusted Domain Project OpenDMARC DMARC Record opendmarc_util.c opendmarc_util_cleanup off-by-one
Source: CVE Program / CVE List V5
Vulnerability Description
A vulnerability was detected in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_util_cleanup in the library libopendmarc/opendmarc_util.c of the component DMARC Record Parser. Performing a manipulation results in off-by-one. The attack may be initiated remotely. The exploit is now public and may be used. The patch is named b3b1da9264bc80324094a27c71e7369bdedc62ae. To fix this issue, it is recommended to deploy a patch.
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 OpenDMARC 1.4.0 cpe:2.3:a:trusted_domain_project:opendmarc:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-101014

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III. Intelligence Information for CVE-2026-101014

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Security Blog Posts for CVE-2026-101014 (1)

Other References for CVE-2026-101014 (3)

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

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
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-193

V. Comments for CVE-2026-101014

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