UBUNTU-CVE-2026-69249

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Source
https://ubuntu.com/security/CVE-2026-69249
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69249.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-69249
Upstream
Published
2026-08-04T00:00:00Z
Modified
2026-08-05T01:45:32.941989027Z
Severity
  • 8.7 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

python-cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. Prior to 49.0.0, when resolving invalid certificate chains that include duplicate copies of self-signed certificates, the processing recursively invokes the same candidate, leading to an exponential blowup. Although the limitation that the chain depth cannot exceed a specified maximum depth prevents unbounded recursion and guarantees termination, an attacker-controlled certificate chain can lead the processing to easily take more than 5s to reject in testing. This amplification could form the basis for a resource exhaustion denial of service attack. The core issue arises in the recursive nature of buildchaininner, which does not de-duplicate against previously analyzed candidates. As the correctness of validation is not affected, the integrity of a system cannot be compromised through this vector, only its availability. This issue is fixed in 49.0.0.

References

Affected packages

Ubuntu:22.04:LTS
python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography?arch=source&distro=jammy

Affected ranges

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

Affected versions

3.*
3.3.2-1
3.3.2-1build1
3.4.8-1
3.4.8-1ubuntu1
3.4.8-1ubuntu2
3.4.8-1ubuntu2.1
3.4.8-1ubuntu2.2
3.4.8-1ubuntu2.3
3.4.8-1ubuntu2.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "3.4.8-1ubuntu2.4",
            "binary_name": "python3-cryptography"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69249.json"
Ubuntu:24.04:LTS
python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography?arch=source&distro=noble

Affected ranges

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

Affected versions

38.*
38.0.4-4
38.0.4-4ubuntu1
41.*
41.0.7-3
41.0.7-4build2
41.0.7-4build3
41.0.7-4ubuntu0.1
41.0.7-4ubuntu0.3
41.0.7-4ubuntu0.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "41.0.7-4ubuntu0.4",
            "binary_name": "python3-cryptography"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69249.json"
Ubuntu:26.04:LTS
python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography?arch=source&distro=resolute

Affected ranges

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

Affected versions

43.*
43.0.0-1ubuntu1
46.*
46.0.1-1ubuntu2
46.0.5-1ubuntu1
46.0.5-1ubuntu2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "46.0.5-1ubuntu2",
            "binary_name": "python3-cryptography"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69249.json"
Ubuntu:Pro:16.04:LTS
python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography?arch=source&distro=esm-infra%2Fxenial

Affected ranges

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

Affected versions

1.*
1.0.1-1ubuntu1
1.0.2-1
1.1-1
1.1.1-1
1.1.1-1ubuntu1
1.1.1-1ubuntu2
1.1.1-1ubuntu3
1.2.2-2
1.2.3-1
1.2.3-1ubuntu0.1
1.2.3-1ubuntu0.2
1.2.3-1ubuntu0.3
1.2.3-1ubuntu0.3+esm1
1.2.3-1ubuntu0.3+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "1.2.3-1ubuntu0.3+esm3",
            "binary_name": "python-cryptography"
        },
        {
            "binary_version": "1.2.3-1ubuntu0.3+esm3",
            "binary_name": "python3-cryptography"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69249.json"
Ubuntu:Pro:18.04:LTS
python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography?arch=source&distro=esm-infra%2Fbionic

Affected ranges

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

Affected versions

1.*
1.9-1
2.*
2.1.3-3
2.1.4-1
2.1.4-1build1
2.1.4-1build2
2.1.4-1ubuntu1
2.1.4-1ubuntu1.1
2.1.4-1ubuntu1.2
2.1.4-1ubuntu1.3
2.1.4-1ubuntu1.4
2.1.4-1ubuntu1.4+esm1
2.1.4-1ubuntu1.4+esm3

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.1.4-1ubuntu1.4+esm3",
            "binary_name": "python-cryptography"
        },
        {
            "binary_version": "2.1.4-1ubuntu1.4+esm3",
            "binary_name": "python3-cryptography"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69249.json"
Ubuntu:Pro:20.04:LTS
python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography?arch=source&distro=esm-infra%2Ffocal

Affected ranges

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

Affected versions

2.*
2.6.1-3.1
2.6.1-4
2.6.1-4ubuntu1
2.8-1ubuntu2
2.8-2
2.8-3
2.8-3ubuntu0.1
2.8-3ubuntu0.2
2.8-3ubuntu0.3
2.8-3ubuntu0.3+esm2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "2.8-3ubuntu0.3+esm2",
            "binary_name": "python-cryptography"
        },
        {
            "binary_version": "2.8-3ubuntu0.3+esm2",
            "binary_name": "python3-cryptography"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69249.json"