USN-8776-1

It was discovered that python-cryptography incorrectly accepted objects with immutable buffers when performing certain cipher operations. This would result in corrupted output, contrary to expectations. This issue only affected Ubuntu 18.04 LTS. (CVE-2023-23931)

It was discovered that python-cryptography reported the outcome of decrypting PKCS#7 enveloped data in distinguishable ways, and with observable timing differences. A remote attacker could possibly use this issue to recover the key used to encrypt the message contents, and obtain sensitive information. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-69247)

Jack Lloyd discovered that python-cryptography incorrectly handled wildcard DNS names when enforcing the name constraints of a certificate authority. A remote attacker could possibly use this issue to have an invalid certificate chain accepted, and use names outside of the permitted ones. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-69248)

Samuel Judson discovered that python-cryptography incorrectly handled certificate chains that contained duplicate certificates. A remote attacker could possibly use this issue to cause python-cryptography to use excessive resources, leading to a denial of service. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-69249)

References

Affected packages

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

0 Unknown introduced version / All previous versions are affected

Fixed

2.1.4-1ubuntu1.4+esm6

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

{
    "availability":  "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "binaries":  [
        {
            "binary_name":  "python-cryptography",
            "binary_version":  "2.1.4-1ubuntu1.4+esm6"
        },
        {
            "binary_name":  "python3-cryptography",
            "binary_version":  "2.1.4-1ubuntu1.4+esm6"
        }
    ]
}

Database specific

cves_map

{
    "cves":  [
        {
            "id":  "CVE-2023-23931",
            "severity":  [
                {
                    "score":  "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L",
                    "type":  "CVSS_V3"
                },
                {
                    "score":  "low",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:Pro:18.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8776-1.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

0 Unknown introduced version / All previous versions are affected

Fixed

46.0.5-1ubuntu2.2

Affected versions

43.*

43.0.0-1ubuntu1

46.*

46.0.1-1ubuntu2

46.0.5-1ubuntu1

46.0.5-1ubuntu2

Ecosystem specific

{
    "availability":  "No subscription required",
    "binaries":  [
        {
            "binary_name":  "python3-cryptography",
            "binary_version":  "46.0.5-1ubuntu2.2"
        }
    ]
}

Database specific

cves_map

{
    "cves":  [
        {
            "id":  "CVE-2026-69247",
            "severity":  [
                {
                    "score":  "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",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-69248",
            "severity":  [
                {
                    "score":  "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:P",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        },
        {
            "id":  "CVE-2026-69249",
            "severity":  [
                {
                    "score":  "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",
                    "type":  "CVSS_V4"
                },
                {
                    "score":  "medium",
                    "type":  "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem":  "Ubuntu:26.04:LTS"
}

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8776-1.json"