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Public proof of concept

CVE-2026-101279

A public proof of concept exists; no exploitation attested.

  • Published2026-09-29
  • WeaknessCWE-189 · CWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC
  1. 2026-09-2901:16CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-101279?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-101279?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

Products declared by the CNA1 product

As VulDB, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • Trusted Domain Project OpenDMARC
    Affected
    • = 1.4.0no fix stated
    • = 1.4.1no fix stated
    • = 1.4.2no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2026-09-29

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • opendmarcUbuntu:Pro:16.04:LTSall versions · no fixed version listed
  • opendmarcUbuntu:26.10all versions · no fixed version listed
  • opendmarcUbuntu:26.04:LTSall versions · no fixed version listed
  • opendmarcUbuntu:24.04:LTSall versions · no fixed version listed
  • opendmarcUbuntu:22.04:LTSall versions · no fixed version listed
  • opendmarcUbuntu:20.04:LTSall versions · no fixed version listed
  • opendmarcUbuntu:18.04:LTSall versions · no fixed version listed
  • opendmarcDebian:14all versions · no fixed version listed

2 more package ranges on OSV.dev

Vendor advisories

  • CVE-2026-101279 Red Hat Product Security

    opendmarc: opendmarc: Denial of service via integer overflow in policy parser

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVE recordread 2026-10-23
  • CISA-ADPSSVC decisionpoc2026-09-29
  • OpenCVESSVC decisionpoc—
  • CNACVSS 4.05.5known since 2026-10-23
  • CNACVSS 3.16.5known since 2026-10-23
  • CNACVSS 2.06.4known since 2026-10-23
  • CNAweakness (CWE)CWE-189, CWE-190known since 2026-10-23
  • FIRST EPSSEPSS score0.3 %2026-11-03
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
CVSS 4.0 vector
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
Published
2026-09-29
Last Modified
2026-09-29
NVD status
Deferred
GitHub Advisory
GHSA-3h24-2ph8-4r6f

Frequently asked questions

What is CVE-2026-101279?

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.

Is CVE-2026-101279 actively exploited?

A proof-of-concept exploit exists for CVE-2026-101279, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2026-101279?

CVE-2026-101279 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L.

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Sources for this record