What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-28 · updated 2026-09-28
• Weakness: CWE-189

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.

Affected products

• Trusted Domain Project OpenDMARC: 1.4.0, 1.4.1, 1.4.2

References

• https://github.com/trusteddomainproject/OpenDMARC/commit/b3b1da9264bc80324094a27c71e7369bdedc62ae
• https://github.com/trusteddomainproject/OpenDMARC/pull/188
• https://github.com/trusteddomainproject/OpenDMARC/pull/344
• https://vuldb.com/cve/CVE-2026-101014
• https://vuldb.com/submit/917100
• https://vuldb.com/vuln/410884
• https://vuldb.com/vuln/410884/cti
• https://weitongli.com/share/opendmarc-cleanup-off-by-one.html

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