HighFix available
pypy3, python3.11 — security advisory
A flaw was found in python. In algorithms with quadratic time complexity using non-binary bases, when using int("text"), a system could take 50ms to parse an int string with 100,000 digits and 5s for 1,000,000 digits (float, decimal, int.from_bytes(), and int() for binary bases 2, 4, 8, 16, and 32 are not affected). The highest threat from this vulnerability is to system availability.
- Products
- pypy3, python3.11
- Affected versions
- Not specified
- Fixed versions
- 3.11.0~rc2-1, 7.3.10+dfsg-1
- CVEs
- CVE-2020-10735
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 12:53 UTC · Revision 1
Source evidence
A flaw was found in python. In algorithms with quadratic time complexity using non-binary bases, when using int("text"), a system could take 50ms to parse an int string with 100,000 digits and 5s for 1,000,000 digits (float, decimal, int.from_bytes(), and int() for binary bases 2, 4, 8, 16, and 32 are not affected). The highest threat from this vulnerability is to system availability.
osv:DEBIAN-CVE-2020-10735
pypy3
Fixed versions: 7.3.10+dfsg-1
pypy3
Fixed versions: 7.3.10+dfsg-1
pypy3
Fixed versions: 7.3.10+dfsg-1
python3.11
Fixed versions: 3.11.0~rc2-1
Complete source record
{
"id": "9e0d0a4568a1757f5128fcfcb05663d3c793e930218692e1494b9402b92113d6",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2020-10735",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2020-10735",
"summary": "A flaw was found in python. In algorithms with quadratic time complexity using non-binary bases, when using int(\"text\"), a system could take 50ms to parse an int string with 100,000 digits and 5s for 1,000,000 digits (float, decimal, int.from_bytes(), and int() for binary bases 2, 4, 8, 16, and 32 are not affected). The highest threat from this vulnerability is to system availability.",
"evidence": "osv:DEBIAN-CVE-2020-10735",
"products": [
{
"name": {
"value": "pypy3",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.3.10+dfsg-1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "pypy3",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.3.10+dfsg-1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "pypy3",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "7.3.10+dfsg-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python3.11",
"evidence": "/affected/3/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "3.11.0~rc2-1",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2020-10735",
"aliases": [
"DEBIAN-CVE-2020-10735"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.3.10+dfsg-1"
}
]
}
],
"package": {
"name": "pypy3",
"purl": "pkg:deb/debian/pypy3?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-10735.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.3.10+dfsg-1"
}
]
}
],
"package": {
"name": "pypy3",
"purl": "pkg:deb/debian/pypy3?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-10735.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "7.3.10+dfsg-1"
}
]
}
],
"package": {
"name": "pypy3",
"purl": "pkg:deb/debian/pypy3?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-10735.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "3.11.0~rc2-1"
}
]
}
],
"package": {
"name": "python3.11",
"purl": "pkg:deb/debian/python3.11?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2020-10735.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-26T12:01:13.304328494Z",
"provider": "osv",
"upstream": [
"CVE-2020-10735"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2020-10735"
]
},
"related_cves": [
{
"value": "CVE-2020-10735",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 451511,
"published_at": "2022-09-09T14:15:08.66+00:00"
}