UBUNTU-CVE-2026-69247

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Source
https://ubuntu.com/security/CVE-2026-69247
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69247.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-69247
Upstream
Published
2026-08-03T22:16:00Z
Modified
2026-08-06T00:23:23Z
Severity
  • 8.2 (High) CVSS_V4 - CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. From 44.0.0 until 50.0.0, pkcs7decryptder, pkcs7decryptpem, and pkcs7decryptsmime reported the outcome of decrypting a RecipientInfo's encryptedKey in several distinguishable ways, one of which disclosed the exact length recovered from the RSA operation. The same distinction was also observable by timing. An application that decrypts attacker-supplied EnvelopedData and reflects the outcome gives the attacker a Bleichenbacher oracle against the content-encryption key. Decryption ran as RSA PKCS#1 v1.5 decrypt of encryptedKey, build an AES cipher from the result, then AES-CBC decrypt and PKCS#7 unpad. Invalid RSA padding, a valid padding with a bad key length, a correct length with a wrong key, and the real key each failed or succeeded differently. Case 1 is reachable only where the linked library lacks implicit rejection: OpenSSL 3.0 and 3.1, LibreSSL, and BoringSSL. Exploitation requires a service that auto-decrypts untrusted EnvelopedData matching the victim certificate and answers adaptively at high volume, such as an S/MIME gateway or mail filter. This issue is fixed in 50.0.0.

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_name": "python3-cryptography",
            "binary_version": "3.4.8-1ubuntu2.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69247.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_name": "python3-cryptography",
            "binary_version": "41.0.7-4ubuntu0.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69247.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_name": "python3-cryptography",
            "binary_version": "46.0.5-1ubuntu2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69247.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_name": "python-cryptography",
            "binary_version": "1.2.3-1ubuntu0.3+esm3"
        },
        {
            "binary_name": "python3-cryptography",
            "binary_version": "1.2.3-1ubuntu0.3+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69247.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_name": "python-cryptography",
            "binary_version": "2.1.4-1ubuntu1.4+esm3"
        },
        {
            "binary_name": "python3-cryptography",
            "binary_version": "2.1.4-1ubuntu1.4+esm3"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69247.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_name": "python-cryptography",
            "binary_version": "2.8-3ubuntu0.3+esm2"
        },
        {
            "binary_name": "python3-cryptography",
            "binary_version": "2.8-3ubuntu0.3+esm2"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-69247.json"