ubuntu-cve-2026-32884
Vulnerability from osv_ubuntu
Published
2026-03-30 21:17
Modified
2026-05-20 15:27
Summary
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
- 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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