UBUNTU-CVE-2026-101281 (CVE-2026-101281)
Vulnerability from osv_ubuntu – Published: 2026-09-29 00:00 – Updated: 2026-09-29 00:00 – Source website
VLAI
Details
A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_sp2_find_mailfrom_domain of the file libopendmarc/opendmarc_spf.c of the component SPF Macro Handler. This manipulation causes improper authentication. The attack is possible to be carried out remotely. The exploit has been published and may be used. Patch name: c48a74c758677fc5272a73eff15ffdbf8afda1a6. Applying a patch is the recommended action to fix this issue.
Severity
7.3 (High)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libopendmarc2",
"binary_version": "1.3.1+dfsg-3ubuntu0.1~esm1"
},
{
"binary_name": "opendmarc",
"binary_version": "1.3.1+dfsg-3ubuntu0.1~esm1"
},
{
"binary_name": "rddmarc",
"binary_version": "1.3.1+dfsg-3ubuntu0.1~esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:16.04:LTS",
"name": "opendmarc",
"purl": "pkg:deb/ubuntu/opendmarc@1.3.1+dfsg-3ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.3.1+dfsg-2",
"1.3.1+dfsg-3",
"1.3.1+dfsg-3ubuntu0.1~esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libopendmarc2",
"binary_version": "1.3.2-3ubuntu0.2"
},
{
"binary_name": "opendmarc",
"binary_version": "1.3.2-3ubuntu0.2"
},
{
"binary_name": "rddmarc",
"binary_version": "1.3.2-3ubuntu0.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "opendmarc",
"purl": "pkg:deb/ubuntu/opendmarc@1.3.2-3ubuntu0.2?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.3.2-2",
"1.3.2-3",
"1.3.2-3ubuntu0.1",
"1.3.2-3ubuntu0.2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libopendmarc2",
"binary_version": "1.3.2-7ubuntu0.1"
},
{
"binary_name": "opendmarc",
"binary_version": "1.3.2-7ubuntu0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "opendmarc",
"purl": "pkg:deb/ubuntu/opendmarc@1.3.2-7ubuntu0.1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.3.2-6",
"1.3.2-7",
"1.3.2-7ubuntu0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libopendmarc2",
"binary_version": "1.4.2-1"
},
{
"binary_name": "opendmarc",
"binary_version": "1.4.2-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:22.04:LTS",
"name": "opendmarc",
"purl": "pkg:deb/ubuntu/opendmarc@1.4.2-1?arch=source\u0026distro=jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.0~beta1+dfsg-6",
"1.4.1.1-1",
"1.4.1.1-2",
"1.4.2-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libopendmarc2t64",
"binary_version": "1.4.2-4.1build2"
},
{
"binary_name": "opendmarc",
"binary_version": "1.4.2-4.1build2"
}
]
},
"package": {
"ecosystem": "Ubuntu:24.04:LTS",
"name": "opendmarc",
"purl": "pkg:deb/ubuntu/opendmarc@1.4.2-4.1build2?arch=source\u0026distro=noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.2-3",
"1.4.2-4",
"1.4.2-4.1build1",
"1.4.2-4.1build2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libopendmarc2t64",
"binary_version": "1.4.2-5.1build1"
},
{
"binary_name": "opendmarc",
"binary_version": "1.4.2-5.1build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "opendmarc",
"purl": "pkg:deb/ubuntu/opendmarc@1.4.2-5.1build1?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.4.2-5.1",
"1.4.2-5.1build1"
]
}
],
"aliases": [],
"details": "A flaw has been found in Trusted Domain Project OpenDMARC up to 1.4.2. Affected by this vulnerability is the function opendmarc_sp2_find_mailfrom_domain of the file libopendmarc/opendmarc_spf.c of the component SPF Macro Handler. This manipulation causes improper authentication. The attack is possible to be carried out remotely. The exploit has been published and may be used. Patch name: c48a74c758677fc5272a73eff15ffdbf8afda1a6. Applying a patch is the recommended action to fix this issue.",
"id": "UBUNTU-CVE-2026-101281",
"modified": "2026-09-29T00:00:00Z",
"published": "2026-09-29T00:00:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-101281"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-101281"
},
{
"type": "REPORT",
"url": "https://github.com/trusteddomainproject/OpenDMARC/commit/c48a74c758677fc5272a73eff15ffdbf8afda1a6"
},
{
"type": "REPORT",
"url": "https://github.com/trusteddomainproject/OpenDMARC/issues/262"
},
{
"type": "REPORT",
"url": "https://github.com/trusteddomainproject/OpenDMARC/pull/328"
},
{
"type": "REPORT",
"url": "https://vuldb.com/cve/CVE-2026-101281"
},
{
"type": "REPORT",
"url": "https://vuldb.com/submit/918284"
},
{
"type": "REPORT",
"url": "https://vuldb.com/vuln/411038"
},
{
"type": "REPORT",
"url": "https://vuldb.com/vuln/411038/cti"
},
{
"type": "REPORT",
"url": "https://xuyongzhe-vt.github.io/share/opendmarc-spf-postmaster-macro.html"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
"type": "CVSS_V3"
},
{
"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",
"type": "CVSS_V4"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-101281"
]
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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
| Author | Source | Type | Date | Other |
|---|
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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