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High severity · published Sep 28, 2026
CVE-2026-101014
Trusted Domain Project OpenDMARC DMARC Record opendmarc_util.c opendmarc_util_cleanup off-by-one
7.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
Low
Availability
Low
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 24% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
OpenDMARC · Trusted Domain Project
1.4.0; 1.4.1; 1.4.2 · source: vendor
Affected product
OP
OpenDMARC
Trusted Domain Project
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-101014
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-101014
vdb-entry
https://vuldb.com/vuln/410884
signature
https://vuldb.com/vuln/410884/cti
third-party-advisory
https://vuldb.com/cve/CVE-2026-101014
third-party-advisory
https://vuldb.com/submit/917100
issue-tracking
https://github.com/trusteddomainproject/OpenDMARC/pull/188
issue-tracking
https://github.com/trusteddomainproject/OpenDMARC/pull/344
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