UBUNTU-CVE-2026-34580

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-34580
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34580.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-34580
Upstream
  • CVE-2026-34580
Published
2026-04-07T22:16:00Z
Modified
2026-05-20T16:25:34.058648671Z
Severity
  • 9.3 (Critical) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Botan is a C++ cryptography library. In 3.11.0, the function CertificateStore::certificateknown had a misleading name; it would return true if any certificate in the store had a DN (and subject key identifier, if set) matching that of the argument. It did not check that the cert it found and the cert it was passed were actually the same certificate. In 3.11.0 an extension of path validation logic was made which assumed that certificate_known only returned true if the certificates were in fact identical. The impact is that if an end entity certificate is presented, and its DN (and subject key identifier, if set) match that of any trusted root, the end entity certificate is accepted immediately as if it itself were a trusted root. , This vulnerability is fixed in 3.11.1.

References

Affected packages

Ubuntu:18.04:LTS
botan

Package

Name
botan
Purl
pkg:deb/ubuntu/botan?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.4.0-3
2.4.0-4
2.4.0-5ubuntu1

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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34580.json"
Ubuntu:20.04:LTS
botan

Package

Name
botan
Purl
pkg:deb/ubuntu/botan?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.9.0-2
2.9.0-2build1
2.12.1-2
2.12.1-2build1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "botan",
            "binary_version": "2.12.1-2build1"
        },
        {
            "binary_name": "libbotan-2-12",
            "binary_version": "2.12.1-2build1"
        },
        {
            "binary_name": "python3-botan",
            "binary_version": "2.12.1-2build1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34580.json"
Ubuntu:25.10
botan

Package

Name
botan
Purl
pkg:deb/ubuntu/botan?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.19.5+dfsg-4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "libbotan-2-19",
            "binary_version": "2.19.5+dfsg-4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34580.json"
botan3

Package

Name
botan3
Purl
pkg:deb/ubuntu/botan3?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.7.1+dfsg-2

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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34580.json"
Ubuntu:26.04:LTS
botan3

Package

Name
botan3
Purl
pkg:deb/ubuntu/botan3?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

3.*
3.7.1+dfsg-2
3.10.0+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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34580.json"
Ubuntu:Pro:22.04:LTS
botan

Package

Name
botan
Purl
pkg:deb/ubuntu/botan?arch=source&distro=esm-apps%2Fjammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.17.3+dfsg-3
2.19.1+dfsg-2ubuntu1
2.19.1+dfsg-2ubuntu1+esm1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "botan",
            "binary_version": "2.19.1+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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34580.json"
Ubuntu:Pro:24.04:LTS
botan

Package

Name
botan
Purl
pkg:deb/ubuntu/botan?arch=source&distro=esm-apps%2Fnoble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.19.3+dfsg-1ubuntu1
2.19.3+dfsg-1ubuntu2
2.19.3+dfsg-1ubuntu2+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"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34580.json"