EUVD-2026-88594
GHSA-3h24-2ph8-4r6f
Severity by source
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Remotely reachable via attacker-published DMARC DNS record with no auth or interaction (AV:N/AC:L/PR:N/UI:N); integer overflow yields low integrity impact on policy handling and low availability impact, no confidentiality (C:N/I:L/A:L).
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
4DescriptionCVE.org
A security vulnerability has been detected in Trusted Domain Project OpenDMARC up to 1.4.2. This impacts an unknown function of the file libopendmarc/opendmarc_policy.c of the component DMARC Parser. The manipulation of the argument pct leads to integer overflow. Remote exploitation of the attack is possible. The exploit has been disclosed publicly and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
AnalysisAI
Integer overflow in OpenDMARC through 1.4.2 allows unauthenticated remote attackers to corrupt DMARC policy-percentage handling by supplying a crafted 'pct=' value in a DMARC DNS TXT record. Publicly available exploit code exists, but the vulnerability is not confirmed actively exploited (CISA KEV). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the victim to run OpenDMARC (<=1.4.2) actively performing DMARC verification on inbound mail, and the attacker must be able to publish a DMARC DNS TXT record (i.e., control the DNS/DMARC policy for a domain the victim's mail flow will evaluate) containing a crafted 'pct=' tag value. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a real but low-to-moderate priority issue best characterized as a high-CVSS-optics/low-real-impact flaw. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch has been identified at the time of analysis; the vendor was contacted early but did not respond. … Detailed patch versions, workarounds, and compensating controls in full report. |
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OpenDMARC through 1.3.2 and 1.4.x through 1.4.0-Beta1 has improper null termination in the function opendmarc_xml_parse
OpenDMARC 1.4.2 contains a null pointer dereference vulnerability in /OpenDMARC/libopendmarc/opendmarc_policy.c. Rated h
OpenDMARC 1.4.1 and 1.4.1.1 allows remote attackers to cause a denial of service (NULL pointer dereference and applicati
OpenDMARC through 1.3.2 and 1.4.x through 1.4.0-Beta1 is prone to a signature-bypass vulnerability with multiple From: a
Email authentication bypass in OpenDMARC up to 1.4.2 allows remote unauthenticated attackers to spoof sender domains by
DMARC authentication bypass in Trusted Domain Project OpenDMARC through 1.4.2 lets a remote attacker defeat the DMARC an
DMARC policy evaluation in Trusted Domain Project OpenDMARC through 1.4.2 can be bypassed by mail carrying sending-domai
OpenDMARC through 1.4.2 can mishandle Internationalized Domain Name labels during DMARC policy lookup in opendmarc_polic
Malformed DMARC policy tags (fo, rf, ri, pct, sp, adkim, aspf, rua, ruf) supplied in attacker-controlled DNS TXT records
Off-by-one bounds error in Trusted Domain Project OpenDMARC through 1.4.2 lets a remote, unauthenticated attacker send a
A NULL pointer dereference in the Trusted Domain Project's OpenDMARC (up to and including 1.4.2) can crash the mail filt
OpenDMARC through 1.3.2 and 1.4.x allows attacks that inject authentication results to provide false information about t
Same weakness CWE-190 – Integer Overflow or Wraparound
View allSame technique Integer Overflow
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External POC / Exploit Code
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