Trusted Domain Project OpenDMARC opendmarc_policy.c opendmarc_policy_parse_dmarc exceptional condition
Published Sep 28, 2026
6.9
MEDIUMCVSS 4.0
EPSS 0.32%
Description
A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2. This affects the function opendmarc_policy_parse_dmarc in the library libopendmarc/opendmarc_policy.c. The manipulation of the argument fo/rf/ri/pct/sp/adkim/aspf/rua/ruf leads to handling of exceptional conditions. Remote exploitation of the attack is possible. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
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:N/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:L/A:L
1 other source (CVE.org) ▾
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:P/RL:X/RC:C
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L/E:P/RL:X/RC:C
AV:N/AC:L/Au:N/C:N/I:P/A:P/E:POC/RL:ND/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 3, 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 3, 2026 | 0.32% (0.00324) | 23.26th | v5 (v2026.06.15) |
| Oct 1, 2026 | 0.32% (0.00324) | 23.15th | v5 (v2026.06.15) |
References (9)
- https://access.redhat.com/security/cve/CVE-2026-101016 Vendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2542375 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2026-101016
- https://vuldb.com/cve/CVE-2026-101016 third-party-advisory
- https://vuldb.com/submit/918242 third-party-advisory
- https://vuldb.com/vuln/410886 vdb-entrytechnical-description
- https://vuldb.com/vuln/410886/cti signaturepermissions-required
- https://www.cve.org/CVERecord?id=CVE-2026-101016
- https://xuyongzhe-vt.github.io/share/opendmarc-bad-tag-drops-policy.html exploit
| Link | Providers | Tags |
|---|---|---|
| https://access.redhat.com/security/cve/CVE-2026-101016 | Vendor Advisory | |
| https://bugzilla.redhat.com/show_bug.cgi?id=2542375 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-101016 | ||
| https://vuldb.com/cve/CVE-2026-101016 | third-party-advisory | |
| https://vuldb.com/submit/918242 | third-party-advisory | |
| https://vuldb.com/vuln/410886 | vdb-entrytechnical-description | |
| https://vuldb.com/vuln/410886/cti | signaturepermissions-required | |
| https://www.cve.org/CVERecord?id=CVE-2026-101016 | ||
| https://xuyongzhe-vt.github.io/share/opendmarc-bad-tag-drops-policy.html | exploit |
Change history (0)
No recorded changes yet.