Trusted Domain Project OpenDMARC DMARC Record opendmarc_util.c opendmarc_util_cleanup off-by-one
Published Sep 28, 2026
6.9
MEDIUMCVSS 4.0
EPSS 0.31%
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
-
- Version 1.4.0StatusaffectedConstraints-
- Version 1.4.1StatusaffectedConstraints-
- Version 1.4.2StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Trusted Domain Project | OpenDMARC | n/a |
|
No data.
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
Red Hat statement
OpenDMARC is not shipped in any Red Hat product. It is available only in Fedora and EPEL community repositories.
Red Hat mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Metrics
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
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
1 other source (CVE.org) ▾
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
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
AV:N/AC:L/Au:N/C:P/I:P/A:P/E:POC/RL:OF/RC:C
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
PoCAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Sep 28, 2026 · SSVC 2.0.3
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
Score over time
Oct 2026- EPSS v5
Percentile over time
- EPSS v5
Table of values (2 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 0.31% (0.00314) | 22.09th | v5 (v2026.06.15) |
| Oct 1, 2026 | 0.31% (0.00314) | 22.01th | v5 (v2026.06.15) |
References (12)
- https://access.redhat.com/security/cve/CVE-2026-101014 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2542368 Issue Tracking
- https://github.com/trusteddomainproject/OpenDMARC/commit/b3b1da9264bc80324094a27c71e7369bdedc62ae patch
- https://github.com/trusteddomainproject/OpenDMARC/pull/188 issue-trackingpatch
- https://github.com/trusteddomainproject/OpenDMARC/pull/344 issue-trackingpatch
- https://nvd.nist.gov/vuln/detail/CVE-2026-101014
- https://vuldb.com/cve/CVE-2026-101014 third-party-advisory
- https://vuldb.com/submit/917100 third-party-advisory
- https://vuldb.com/vuln/410884 vdb-entrytechnical-description
- https://vuldb.com/vuln/410884/cti signaturepermissions-required
- https://weitongli.com/share/opendmarc-cleanup-off-by-one.html exploit
- https://www.cve.org/CVERecord?id=CVE-2026-101014
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-101014 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2542368 | Issue Tracking | |
| https://github.com/trusteddomainproject/OpenDMARC/commit/b3b1da9264bc80324094a27c71e7369bdedc62ae | patch | |
| https://github.com/trusteddomainproject/OpenDMARC/pull/188 | issue-trackingpatch | |
| https://github.com/trusteddomainproject/OpenDMARC/pull/344 | issue-trackingpatch | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-101014 | ||
| https://vuldb.com/cve/CVE-2026-101014 | third-party-advisory | |
| https://vuldb.com/submit/917100 | third-party-advisory | |
| https://vuldb.com/vuln/410884 | vdb-entrytechnical-description | |
| https://vuldb.com/vuln/410884/cti | signaturepermissions-required | |
| https://weitongli.com/share/opendmarc-cleanup-off-by-one.html | exploit | |
| https://www.cve.org/CVERecord?id=CVE-2026-101014 |
Change history (0)
No recorded changes yet.