UBUNTU-CVE-2026-32884 (CVE-2026-32884)
Vulnerability from osv_ubuntu – Published: 2026-03-30 21:17 – Updated: 2026-05-20 15:27 – Source website
VLAI
Details
Botan is a C++ cryptography library. Prior to version 3.11.0, during processing of an X.509 certificate path using name constraints which restrict the set of allowable DNS names, if no subject alternative name is defined in the end-entity certificate Botan would check that the CN was allowed by the DNS name constraints, even though this check is technically not required by RFC 5280. However this check failed to account for the possibility of a mixed-case CN. Thus a certificate with CN=Sub.EVIL.COM and no subject alternative name would bypasses an excludedSubtrees constraint for evil.com because the comparison is case-sensitive. This issue has been patched in version 3.11.0.
Severity
5.9 (Medium)
N/A (UNKNOWN)
References
{
"affected": [
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbotan-1.10-0",
"binary_version": "1.10.5-1+deb7u1ubuntu0.14.04.1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:14.04:LTS",
"name": "botan1.10",
"purl": "pkg:deb/ubuntu/botan1.10@1.10.5-1+deb7u1ubuntu0.14.04.1+esm1?arch=source\u0026distro=esm-infra-legacy/trusty"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.10.5-1",
"1.10.5-1ubuntu1",
"1.10.5-1+deb7u1ubuntu0.14.04.1",
"1.10.5-1+deb7u1ubuntu0.14.04.1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbotan-1.10-1",
"binary_version": "1.10.12-1"
}
]
},
"package": {
"ecosystem": "Ubuntu:16.04:LTS",
"name": "botan1.10",
"purl": "pkg:deb/ubuntu/botan1.10@1.10.12-1?arch=source\u0026distro=xenial"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.10.10-6",
"1.10.12-1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "botan",
"binary_version": "2.4.0-5ubuntu1"
},
{
"binary_name": "libbotan-2-4",
"binary_version": "2.4.0-5ubuntu1"
},
{
"binary_name": "python3-botan",
"binary_version": "2.4.0-5ubuntu1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "botan",
"purl": "pkg:deb/ubuntu/botan@2.4.0-5ubuntu1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.4.0-3",
"2.4.0-4",
"2.4.0-5ubuntu1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbotan-1.10-1",
"binary_version": "1.10.17-0.1"
}
]
},
"package": {
"ecosystem": "Ubuntu:18.04:LTS",
"name": "botan1.10",
"purl": "pkg:deb/ubuntu/botan1.10@1.10.17-0.1?arch=source\u0026distro=bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.10.16-1",
"1.10.17-0.1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "botan",
"binary_version": "2.12.1-2build1"
},
{
"binary_name": "libbotan-2-12",
"binary_version": "2.12.1-2build1"
},
{
"binary_name": "python3-botan",
"binary_version": "2.12.1-2build1"
}
]
},
"package": {
"ecosystem": "Ubuntu:20.04:LTS",
"name": "botan",
"purl": "pkg:deb/ubuntu/botan@2.12.1-2build1?arch=source\u0026distro=focal"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.9.0-2",
"2.9.0-2build1",
"2.12.1-2",
"2.12.1-2build1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "botan",
"binary_version": "2.19.1+dfsg-2ubuntu1+esm1"
},
{
"binary_name": "libbotan-2-19",
"binary_version": "2.19.1+dfsg-2ubuntu1+esm1"
},
{
"binary_name": "python3-botan",
"binary_version": "2.19.1+dfsg-2ubuntu1+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:22.04:LTS",
"name": "botan",
"purl": "pkg:deb/ubuntu/botan@2.19.1+dfsg-2ubuntu1+esm1?arch=source\u0026distro=esm-apps/jammy"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.17.3+dfsg-3",
"2.19.1+dfsg-2ubuntu1",
"2.19.1+dfsg-2ubuntu1+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "botan",
"binary_version": "2.19.3+dfsg-1ubuntu2+esm1"
},
{
"binary_name": "libbotan-2-19",
"binary_version": "2.19.3+dfsg-1ubuntu2+esm1"
},
{
"binary_name": "python3-botan",
"binary_version": "2.19.3+dfsg-1ubuntu2+esm1"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:24.04:LTS",
"name": "botan",
"purl": "pkg:deb/ubuntu/botan@2.19.3+dfsg-1ubuntu2+esm1?arch=source\u0026distro=esm-apps/noble"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.19.3+dfsg-1ubuntu1",
"2.19.3+dfsg-1ubuntu2",
"2.19.3+dfsg-1ubuntu2+esm1"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "libbotan-2-19",
"binary_version": "2.19.5+dfsg-4"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "botan",
"purl": "pkg:deb/ubuntu/botan@2.19.5+dfsg-4?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"2.19.5+dfsg-4"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "botan",
"binary_version": "3.7.1+dfsg-2"
},
{
"binary_name": "libbotan-3-7",
"binary_version": "3.7.1+dfsg-2"
},
{
"binary_name": "python3-botan",
"binary_version": "3.7.1+dfsg-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:25.10",
"name": "botan3",
"purl": "pkg:deb/ubuntu/botan3@3.7.1+dfsg-2?arch=source\u0026distro=questing"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.7.1+dfsg-2"
]
},
{
"ecosystem_specific": {
"binaries": [
{
"binary_name": "botan",
"binary_version": "3.10.0+dfsg-2"
},
{
"binary_name": "libbotan-3-10",
"binary_version": "3.10.0+dfsg-2"
},
{
"binary_name": "python3-botan",
"binary_version": "3.10.0+dfsg-2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "botan3",
"purl": "pkg:deb/ubuntu/botan3@3.10.0+dfsg-2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"3.7.1+dfsg-2",
"3.10.0+dfsg-2"
]
}
],
"aliases": [],
"details": "Botan is a C++ cryptography library. Prior to version 3.11.0, during processing of an X.509 certificate path using name constraints which restrict the set of allowable DNS names, if no subject alternative name is defined in the end-entity certificate Botan would check that the CN was allowed by the DNS name constraints, even though this check is technically not required by RFC 5280. However this check failed to account for the possibility of a mixed-case CN. Thus a certificate with CN=Sub.EVIL.COM and no subject alternative name would bypasses an excludedSubtrees constraint for evil.com because the comparison is case-sensitive. This issue has been patched in version 3.11.0.",
"id": "UBUNTU-CVE-2026-32884",
"modified": "2026-05-20T15:27:21Z",
"published": "2026-03-30T21:17:00Z",
"references": [
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-32884"
},
{
"type": "REPORT",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-32884"
},
{
"type": "REPORT",
"url": "https://github.com/randombit/botan/security/advisories/GHSA-7c3g-7763-ggj5"
}
],
"related": [],
"schema_version": "1.7.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N",
"type": "CVSS_V3"
},
{
"score": "medium",
"type": "Ubuntu"
}
],
"upstream": [
"CVE-2026-32884"
]
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
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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.
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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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