CriticalFix available
py3-cryptography — security advisory
In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.
- Products
- py3-cryptography
- Affected versions
- Not specified
- Fixed versions
- 3.2.2-r0, 3.3.2-r0
- CVEs
- CVE-2020-36242
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:11 UTC · Revision 1
Source evidence
In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.
osv:ALPINE-CVE-2020-36242
py3-cryptography
Fixed versions: 3.3.2-r0
py3-cryptography
Fixed versions: 3.2.2-r0
py3-cryptography
Fixed versions: 3.2.2-r0
Complete source record
{
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"url": "https://osv.dev/vulnerability/ALPINE-CVE-2020-36242",
"method": "structured",
"payload": {
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"title": "ALPINE-CVE-2020-36242",
"summary": "In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.",
"evidence": "osv:ALPINE-CVE-2020-36242",
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"aliases": [
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"metrics": [
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"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H"
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"modified": "2026-10-26T11:17:55.175333399Z",
"provider": "osv",
"upstream": [
"CVE-2020-36242"
],
"references": [
"https://security.alpinelinux.org/vuln/CVE-2020-36242"
]
},
"related_cves": [
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"evidence": "/upstream"
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],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 450648,
"published_at": "2021-02-07T20:15:12.09+00:00"
}