High
opendmarc — security advisory
A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this issue is the function opendmarc_policy_query_dmarc in the library libopendmarc/opendmarc_policy.c of the component Internationalized Domain Name Handler. Such manipulation leads to encoding error. It is possible to launch the attack remotely. 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.
- Products
- opendmarc
- Affected versions
- 1.3.1+dfsg-2, 1.3.1+dfsg-3, 1.3.1+dfsg-3ubuntu0.1~esm1, 1.3.2-2, 1.3.2-3, 1.3.2-3ubuntu0.1, 1.3.2-3ubuntu0.2, 1.3.2-6, 1.3.2-7, 1.3.2-7ubuntu0.1, 1.4.0~beta1+dfsg-6, 1.4.1.1-1, 1.4.1.1-2, 1.4.2-1, 1.4.2-3, 1.4.2-4, 1.4.2-4.1build1, 1.4.2-4.1build2, 1.4.2-5.1, 1.4.2-5.1build1
- Fixed versions
- Not specified
- CVEs
- CVE-2026-100891
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 02:53 UTC · Revision 1
Source evidence
A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this issue is the function opendmarc_policy_query_dmarc in the library libopendmarc/opendmarc_policy.c of the component Internationalized Domain Name Handler. Such manipulation leads to encoding error. It is possible to launch the attack remotely. 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.
osv:UBUNTU-CVE-2026-100891
opendmarc
Fixed versions: Not specified
opendmarc
Fixed versions: Not specified
opendmarc
Fixed versions: Not specified
opendmarc
Fixed versions: Not specified
opendmarc
Fixed versions: Not specified
opendmarc
Fixed versions: Not specified
opendmarc
Fixed versions: Not specified
Complete source record
{
"id": "0fab504e453b040bfdc66350e345e3b50766ee792ff9dc1de44e16a43ffb331c",
"url": "https://osv.dev/vulnerability/UBUNTU-CVE-2026-100891",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "UBUNTU-CVE-2026-100891",
"summary": "A vulnerability has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this issue is the function opendmarc_policy_query_dmarc in the library libopendmarc/opendmarc_policy.c of the component Internationalized Domain Name Handler. Such manipulation leads to encoding error. It is possible to launch the attack remotely. 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.",
"evidence": "osv:UBUNTU-CVE-2026-100891",
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"severity": "high",
"structured": {
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"aliases": [
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"metrics": [
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"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
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"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P"
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{
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},
{
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}
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{
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"purl": "pkg:deb/ubuntu/opendmarc?arch=source&distro=bionic",
"ecosystem": "Ubuntu:18.04:LTS"
},
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"1.3.2-3",
"1.3.2-3ubuntu0.1",
"1.3.2-3ubuntu0.2"
],
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],
"modified": "2026-10-17T12:59:42.744898744Z",
"provider": "osv",
"upstream": [
"CVE-2026-100891"
],
"references": [
"https://ubuntu.com/security/CVE-2026-100891",
"https://www.cve.org/CVERecord?id=CVE-2026-100891",
"https://weitongli.com/share/opendmarc-ulabel-not-converted.html",
"https://vuldb.com/cve/CVE-2026-100891",
"https://vuldb.com/submit/917215",
"https://vuldb.com/vuln/410841",
"https://vuldb.com/vuln/410841/cti"
]
},
"related_cves": [
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"value": "CVE-2026-100891",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 359723,
"published_at": "2026-09-28T01:16:00+00:00"
}