No exploitation reportedFix available

CVE-2020-10735

Q: Is CVE-2020-10735 actively exploited?

Active exploitation of CVE-2020-10735 has not been confirmed. Its EPSS score was 4.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-10735?

CVE-2020-10735 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

No exploitation reported by the sources we read.

Published2022-09-09
Fixed in3.10.7 · 3.9.14 · 3.8.14 · 3.7.14
WeaknessCWE-704

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2022-09-0914:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-10735?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-10735?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Python

Branch	Affected	Fixed in	Source
3.10	≥ 3.10.0, < 3.10.7	3.10.7	NVD · OSV
3.9	≥ 3.9.0, < 3.9.14	3.9.14	NVD · OSV
3.8	≥ 3.8.0, < 3.8.14	3.8.14	NVD · OSV
3.7	≥ 3.7.0, < 3.7.14	3.7.14	NVD · OSV
3.11	= 3.11.0	no fix published	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
35.x	= 35	no fix published	NVD
36.x	= 36	no fix published	NVD
37.x	= 37	no fix published	NVD

Redhat enterprise linux

Branch	Affected	Fixed in	Source
8.0	= 8.0	no fix published	NVD

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

platform-pythonAlmaLinux:8all versions · fixed in 3.6.8-48.el8_7.1.almaand 6 other packages
python3AlmaLinux:9all versions · fixed in 3.9.10-3.el9_0and 7 other packages
python38AlmaLinux:8all versions · fixed in 3.8.16-1.module_el8.8.0+3482+d5d93a3eand 7 other packages
python38-asn1cryptoAlmaLinux:8all versions · fixed in 1.2.0-3.module_el8.6.0+2778+cd494b30
python38-atomicwritesAlmaLinux:8all versions · fixed in 1.3.0-8.module_el8.6.0+2778+cd494b30
python38-attrsAlmaLinux:8all versions · fixed in 19.3.0-3.module_el8.6.0+2778+cd494b30
python38-babelAlmaLinux:8all versions · fixed in 2.7.0-11.module_el8.6.0+2778+cd494b30
python38-cffiAlmaLinux:8all versions · fixed in 1.13.2-3.module_el8.6.0+2778+cd494b30

83 more package ranges on OSV.dev

Full record on NVD

Fix

Update Python to 3.10.7 · 3.9.14 · 3.8.14 · 3.7.14

Advisories and patches

github.comPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2026-10-07
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.16.22025-06-09
NVDCVSS 3.17.5read 2026-10-23
CISA-ADPweakness (CWE)CWE-7042025-06-09
NVDweakness (CWE)CWE-704read 2026-10-23
FIRST EPSSEPSS score4.5 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2022-09-09
Last Modified: 2026-10-14
NVD status: Modified

Frequently asked questions

What is CVE-2020-10735?

Is CVE-2020-10735 actively exploited?

Active exploitation of CVE-2020-10735 has not been confirmed. Its EPSS score was 4.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-10735?

CVE-2020-10735 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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