EUVD-2026-88054
GHSA-98vv-3xrg-44wc
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/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
Remote unauthenticated low-complexity trigger via parsed SPF data (AV:N/AC:L/PR:N/UI:N); only a process-crash DoS so C:N/I:N/A:L, no scope change.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
3DescriptionCVE.org
A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_spf_ipv6_explode in the library libopendmarc/opendmarc_spf.c of the component SPF Parser. This manipulation of the argument cp causes null pointer dereference. It is possible to initiate the attack remotely. The exploit has been published and may be used. The vendor was contacted early about this disclosure but did not respond in any way.
AnalysisAI
A NULL pointer dereference in the Trusted Domain Project's OpenDMARC (up to and including 1.4.2) can crash the mail filter when it processes certain SPF data for an inbound message. The flaw sits in opendmarc_spf_ipv6_explode() in libopendmarc/opendmarc_spf.c, where manipulation of the cp argument causes the parser to dereference a NULL pointer; it is remotely reachable by an unauthenticated attacker (CVSS 4.0 6.9, CVSS:3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L) who can influence the SPF information evaluated during mail handling. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Requires the target to run OpenDMARC (<=1.4.2) with its internal SPF evaluation active so that inbound mail reaches opendmarc_spf_ipv6_explode; the attacker must be able to influence the SPF data parsed (e.g., via a controlled sending domain's DNS SPF record processed during mail handling). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | This is a CWE-476 NULL pointer dereference in OpenDMARC's internal SPF parser (opendmarc_spf_ipv6_explode in libopendmarc/opendmarc_spf.c), affecting versions up to 1.4.2. … 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 for OpenDMARC has been identified at time of analysis; the vendor was contacted about the disclosure and did not respond, so treat remediation as compensating-control driven until an upstream fix appears. … 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
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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
Integer overflow in OpenDMARC through 1.4.2 allows unauthenticated remote attackers to corrupt DMARC policy-percentage h
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
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OpenDMARC through 1.3.2 and 1.4.x allows attacks that inject authentication results to provide false information about t
Same weakness CWE-476 – NULL Pointer Dereference
View allSame technique Denial Of Service
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External POC / Exploit Code
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