usn-8776-1
Vulnerability from osv_ubuntu
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)
{
"affected": [
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:Pro:18.04:LTS"
}
},
"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"
}
]
},
"package": {
"ecosystem": "Ubuntu:Pro:18.04:LTS",
"name": "python-cryptography",
"purl": "pkg:deb/ubuntu/python-cryptography@2.1.4-1ubuntu1.4+esm6?arch=source\u0026distro=esm-infra/bionic"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "2.1.4-1ubuntu1.4+esm6"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"1.9-1",
"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"
]
},
{
"database_specific": {
"cves_map": {
"cves": [],
"ecosystem": "Ubuntu:26.04:LTS"
}
},
"ecosystem_specific": {
"availability": "No subscription required",
"binaries": [
{
"binary_name": "python3-cryptography",
"binary_version": "46.0.5-1ubuntu2.2"
}
]
},
"package": {
"ecosystem": "Ubuntu:26.04:LTS",
"name": "python-cryptography",
"purl": "pkg:deb/ubuntu/python-cryptography@46.0.5-1ubuntu2.2?arch=source\u0026distro=resolute"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "46.0.5-1ubuntu2.2"
}
],
"type": "ECOSYSTEM"
}
],
"versions": [
"43.0.0-1ubuntu1",
"46.0.1-1ubuntu2",
"46.0.5-1ubuntu1",
"46.0.5-1ubuntu2"
]
}
],
"aliases": [],
"details": "It was discovered that python-cryptography incorrectly accepted objects\nwith immutable buffers when performing certain cipher operations. This\nwould result in corrupted output, contrary to expectations. This issue only\naffected Ubuntu 18.04 LTS. (CVE-2023-23931)\n\nIt was discovered that python-cryptography reported the outcome of\ndecrypting PKCS#7 enveloped data in distinguishable ways, and with\nobservable timing differences. A remote attacker could possibly use this\nissue to recover the key used to encrypt the message contents, and obtain\nsensitive information. This issue only affected Ubuntu 26.04 LTS.\n(CVE-2026-69247)\n\nJack Lloyd discovered that python-cryptography incorrectly handled wildcard\nDNS names when enforcing the name constraints of a certificate authority. A\nremote attacker could possibly use this issue to have an invalid\ncertificate chain accepted, and use names outside of the permitted ones.\nThis issue only affected Ubuntu 26.04 LTS. (CVE-2026-69248)\n\nSamuel Judson discovered that python-cryptography incorrectly handled\ncertificate chains that contained duplicate certificates. A remote attacker\ncould possibly use this issue to cause python-cryptography to use excessive\nresources, leading to a denial of service. This issue only affected Ubuntu\n26.04 LTS. (CVE-2026-69249)",
"id": "USN-8776-1",
"modified": "2026-09-16T20:12:52Z",
"published": "2026-09-16T20:12:52Z",
"references": [
{
"type": "ADVISORY",
"url": "https://ubuntu.com/security/notices/USN-8776-1"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2023-23931"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-69247"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-69248"
},
{
"type": "REPORT",
"url": "https://ubuntu.com/security/CVE-2026-69249"
}
],
"related": [],
"schema_version": "1.7.0",
"summary": "python-cryptography vulnerabilities",
"upstream": [
"UBUNTU-CVE-2023-23931",
"UBUNTU-CVE-2026-69247",
"UBUNTU-CVE-2026-69248",
"UBUNTU-CVE-2026-69249"
]
}
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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