CVE-2026-101014

Trusted Domain Project OpenDMARC DMARC Record opendmarc_util.c opendmarc_util_cleanup off-by-one

State: Published
Severity: 6.9 Medium
Published: Sep 28, 2026
Updated: Sep 28, 2026
Reserved: Sep 27, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	6.9 Medium	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P	VulDB
3.1	7.3 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	VulDB
3.0	7.3 High	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C	VulDB
2.0	7.5 High	AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C	VulDB

Weaknesses

CWE-193 Off-by-One
CWE-189 Numeric Error

Affected Products

Product	Versions
OpenDMARCTrusted Domain Project	1.4.0Affected 1.4.1Affected 1.4.2Affected

References

VDB-410884 | Trusted Domain Project OpenDMARC DMARC Record opendmarc_util.c opendmarc_util_cleanup off-by-onevdb-entrytechnical-description
VDB-410884 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
CVE-2026-101014 | CVE Analysis and Reportthird-party-advisory
Submit #917100 | The Trusted Domain Project OpenDMARC 1.4.2 Out-of-Bounds Readthird-party-advisory
https://github.com/trusteddomainproject/OpenDMARC/pull/188issue-trackingpatch
https://github.com/trusteddomainproject/OpenDMARC/pull/344issue-trackingpatch
https://weitongli.com/share/opendmarc-cleanup-off-by-one.htmlexploit
https://github.com/trusteddomainproject/OpenDMARC/commit/b3b1da9264bc80324094a27c71e7369bdedc62aepatch

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