CVE-2026-100890 (GCVE-0-2026-100890)

Vulnerability from cvelistv5 – Published: 2026-09-28 00:00 – Updated: 2026-09-28 12:55
VLAI
Title
Trusted Domain Project OpenDMARC SPF Parser opendmarc_spf.c opendmarc_spf_ipv6_explode null pointer dereference
Summary
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.
Severity
6.9 (Medium)
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
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:C
5.3 (Medium)
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:X/RC:C
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-28 12:55 UTC
CWE
Assigner
References
URL Tags
https://vuldb.com/vuln/410840 vdb-entrytechnical-description
https://vuldb.com/vuln/410840/cti signaturepermissions-required
https://vuldb.com/cve/CVE-2026-100890 third-party-advisory
https://vuldb.com/submit/917188 third-party-advisory
https://weitongli.com/share/opendmarc-ip6-wild-po… exploit
Impacted products
Vendor Product Version CPE status
Trusted Domain Project OpenDMARC Affected: 1.4.0
Affected: 1.4.1
Affected: 1.4.2
    cpe:2.3:a:trusted_domain_project:opendmarc:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
WeitongLi (VulDB User) VulDB CNA Team
Show details on NVD website
To clipboard 

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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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