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.
CVE-2020-10735
“—” beside the score: it is equal to NVD's CVSS score.
Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2022-09-10. NVD baseline CVSS 7.5; sources differ by 0.0.
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 7.5
- EG Score
- 7.5HIGHmedium confidence
- EG Risk
- 36EG Risk 36/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity75% × 45%Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation4.5% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 4.5%
- EPSS %ILE
- 91st
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.
- EG Severity
- 7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 4.5% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-21). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at every mission impact level.
A fix is available. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
September 9, 2022
Last Modified
October 14, 2026
Advisory Details (10)
Auto-updated Oct 7, 2026[SECURITY] Fedora 35 Update: python3.8-3.8.14-1.fc35 - package-announce - Fedora mailing-lists
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/32AAQKABEKFCB5DDV5OONRZK6BS23HPW/[SECURITY] Fedora 37 Update: python3.10-3.10.7-1.fc37 - package-announce - Fedora mailing-lists
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6XL6E5A3I36TRR73VNBOXNIQP4AMZDFZ/[SECURITY] Fedora 37 Update: python3.9-3.9.14-1.fc37 - package-announce - Fedora mailing-lists
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HSRPVJZL6DJFWKYRHMNJB7VCEUCBKRF5/[SECURITY] Fedora 36 Update: python3.7-3.7.14-1.fc36 - package-announce - Fedora mailing-lists
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V7ZUJDHK7KNG6SLIFXW7MNZ6O2PUJYK6/[SECURITY] Fedora 36 Update: python3.8-3.8.14-1.fc36 - package-announce - Fedora mailing-lists
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2VCU6EVQDIXNCEDJUCTFIER2WVNNDTYZ/[SECURITY] Fedora 36 Update: python3.9-3.9.14-1.fc36 - package-announce - Fedora mailing-lists
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4EWKR2SPX3JORLWCXFY3KN2U5B5CIUQQ/1834423 – (CVE-2020-10735) CVE-2020-10735 python: int() type in PyLong_FromString() does not limit amount of digits converting text to int leading to DoS
Affected: Red Hat Enterprise Linux 7
https://bugzilla.redhat.com/show_bug.cgi?id=1834423[1-pager] CPython int string conversion limit for CVE-2020-10735 DoS - Google Docs
https://docs.google.com/document/d/1KjuF_aXlzPUxTK4BMgezGJ2Pn7uevfX7g0_mvgHlL7YCVE-2020-10735: Prevent DoS by large int<->str conversions · Issue #95778 · python/cpython · GitHub
https://github.com/python/cpython/issues/95778CVE-2020-10735 - Red Hat Customer Portal
Affected: Red Hat Enterprise Linux 8 are marked as 'Not affected' as they just provide "symlinks" to the main
https://access.redhat.com/security/cve/CVE-2020-10735Vendor Advisories for CVE-2020-10735(8)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
- RHSA-2024:0430Red Hat Product SecurityMedium
Red Hat Security Advisory: python3 security update
- RHSA-2023:2763Red Hat Product SecurityMedium
Red Hat Security Advisory: python38:3.8 and python38-devel:3.8 security update
- RHSA-2023:2764Red Hat Product SecurityMedium
Red Hat Security Advisory: python39:3.9 and python39-devel:3.9 security update
- RHSA-2023:0833Red Hat Product SecurityMedium
Red Hat Security Advisory: python3 security update
- CVE-2020-10735Microsoft Security Response Center (MSRC)High
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 100000 digits and 5s for 1000000 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.
- RHSA-2022:7323Red Hat Product SecurityMedium
Red Hat Security Advisory: python3.9 security update
- RHSA-2022:6766Red Hat Product SecurityMedium
Red Hat Security Advisory: rh-python38-python security update
- GHSA-6jr7-xr67-mgxwGitHub Security AdvisoriesHigh
A flaw was found in python. In algorithms with quadratic time complexity using non-binary bases,...
Patch Availability(6)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| redhat | python3-0:3.6.8-47.el8_6.4 | 2024-01-25 | redhat |
| redhat | python38-devel:3.8-8080020221221151857.0d9ba776 | 2023-05-16 | redhat |
| redhat | python39-devel:3.9-8080020221221152015.aed85c85 | 2023-05-16 | redhat |
| redhat | python3-0:3.6.8-48.el8_7.1 | 2023-02-21 | redhat |
| redhat | python3.9-0:3.9.10-3.el9_0 | 2022-11-02 | redhat |
| redhat | rh-python38-python-0:3.8.14-1.el7 | 2022-10-03 | redhat |
Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.
Affected Packages
(8 across 5 ecosystems)
Debian:11(3)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| pypy3 | 7.3.5+dfsg-2, 7.3.5+dfsg-2+deb11u1, 7.3.5+dfsg-2+deb11u2, 7.3.5+dfsg-2+deb11u3 |
| — |
| python2.7 | 2.7.18-10 ... 2.7.18-9 (10 versions) |
| — |
| python3.9 | 3.9.2-1, 3.9.2-1+deb11u1 |
| — |
Debian:12(2)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| pypy3 | — |
| — |
| python3.11 | — |
| — |
Debian:10(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| python3.7 | 3.7.3-2, 3.7.3-2+deb10u1, 3.7.3-2+deb10u2, 3.7.3-2+deb10u3, 3.7.3-2+deb10u4 |
| — |
Debian:13(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| pypy3 | — |
| — |
Debian:14(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| pypy3 | — |
| — |
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 11× in last 7d / 43× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 97 of 186 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 3 repeat rows among the latest 100 are merged into the row they repeat. The 89 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-10-23 16:27 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-22 16:28 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-21 22:11 UTCEG score recompute
- 2026-10-21 22:11 UTCVendor advisory
- 2026-10-21 22:11 UTCGHSA enrichmentGHSA-6jr7-xr67-mgxw · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-21 16:28 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-20 16:28 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-19 16:27 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-18 16:28 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-18 09:37 UTCEG score recompute
- 2026-10-17 16:28 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-16 16:32 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-15 16:27 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-14 16:28 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-14 09:25 UTCVendor advisory
- 2026-10-14 09:25 UTCGHSA enrichmentGHSA-6jr7-xr67-mgxw · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-14 09:00 UTCEG score recompute
- 2026-10-14 09:00 UTCVendor advisory
- 2026-10-14 09:00 UTCGHSA enrichmentGHSA-6jr7-xr67-mgxw · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-13 16:28 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-12 19:49 UTCEG score recompute
- 2026-10-12 16:29 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-12 00:12 UTCEG score recompute
- 2026-10-11 13:42 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-10 19:56 UTCEPSS rescoreEPSS 4.5% · 91st percentile
Show 72 moreShow fewer
- 2026-10-09 20:03 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-08 16:38 UTCEPSS rescoreEPSS 4.5% · 91st percentile
- 2026-10-07 23:43 UTCEPSS rescoreEPSS 7.2% · 94th percentile
- 2026-10-07 19:27 UTCVendor advisory
- 2026-10-07 19:27 UTCGHSA enrichmentGHSA-6jr7-xr67-mgxw · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-07 18:47 UTCEG score recompute
- 2026-10-07 18:47 UTCVendor advisory
- 2026-10-07 18:47 UTCGHSA enrichmentGHSA-6jr7-xr67-mgxw · GitHub severity HIGH · GitHub CVSS 7.5
- 2026-10-06 15:13 UTCEPSS rescoreEPSS 7.2% · 94th percentile
- 2026-10-05 17:39 UTCEPSS rescoreEPSS 7.2% · 94th percentile
- 2026-10-03 14:22 UTCEPSS rescoreEPSS 7.2% · 94th percentile
- 2026-09-30 14:59 UTCEPSS rescoreEPSS 7.2% · 94th percentile
- 2026-09-30 10:32 UTCEG score recompute
- 2026-09-27 13:40 UTCEPSS rescoreEPSS 7.2% · 94th percentile
- 2026-09-26 15:54 UTCEPSS rescoreEPSS 7.2% · 94th percentile
- 2026-09-26 00:20 UTCEPSS rescoreEPSS 7.2% · 94th percentile
- 2026-09-24 13:59 UTCEPSS rescoreEPSS 7.2% · 94th percentile
- 2026-09-24 12:07 UTCOSV refresh
- 2026-09-22 14:43 UTCEPSS rescoreEPSS 7.2% · 94th percentile
- 2026-09-21 20:28 UTCEPSS rescoreEPSS 7.2% · 94th percentile
- 2026-09-19 15:37 UTCEPSS rescoreEPSS 7.2% · 94th percentile
- 2026-09-18 19:23 UTCEPSS rescoreEPSS 7.2% · 94th percentile
- 2026-09-17 19:22 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
- 2026-09-16 14:04 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
- 2026-09-15 03:06 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
- 2026-09-13 16:42 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
- 2026-09-12 14:56 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
- 2026-09-11 14:48 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
- 2026-09-11 09:32 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
- 2026-09-07 15:57 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
- 2026-09-06 13:44 UTCEPSS rescoreEPSS 7.2% · 93rd percentile
- 2026-09-05 15:24 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-09-05 04:44 UTCOSV refresh
- 2026-09-04 13:56 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-09-04 05:03 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-09-02 14:08 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-09-01 03:32 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-08-30 19:14 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-08-30 01:18 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-08-28 21:37 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-08-27 14:21 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-08-26 14:42 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-08-25 13:45 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-08-20 22:51 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-08-19 17:00 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-08-18 15:28 UTCOSV refresh
- 2026-08-18 13:44 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-08-16 14:52 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-08-16 02:11 UTCEPSS rescoreEPSS 5.8% · 92nd percentile
- 2026-08-15 01:26 UTCEPSS rescoreEPSS 5.7% · 92nd percentile
- 2026-08-13 21:57 UTCEPSS rescoreEPSS 5.7% · 92nd percentile
- 2026-08-12 13:47 UTCEPSS rescoreEPSS 5.7% · 92nd percentile
- 2026-08-09 13:43 UTCEPSS rescoreEPSS 5.9% · 92nd percentile
- 2026-08-08 16:33 UTCEPSS rescoreEPSS 5.9% · 92nd percentile
- 2026-08-07 16:23 UTCEPSS rescoreEPSS 5.9% · 92nd percentile
- 2026-08-06 13:43 UTCEPSS rescoreEPSS 5.9% · 92nd percentile
- 2026-08-05 19:14 UTCEPSS rescoreEPSS 5.9% · 92nd percentile
- 2026-08-04 15:06 UTCEPSS rescoreEPSS 5.9% · 92nd percentile
- 2026-08-03 10:57 UTCOSV refresh
- 2026-08-03 10:32 UTCEPSS rescoreEPSS 5.9% · 92nd percentile
- 2026-08-02 02:23 UTCEPSS rescoreEPSS 5.9% · 92nd percentile
- 2026-08-01 04:12 UTCEPSS rescoreEPSS 5.9% · 92nd percentile
- 2026-07-30 16:24 UTCEPSS rescoreEPSS 5.9% · 92nd percentile
- 2026-07-30 01:27 UTCEPSS rescoreEPSS 5.9% · 92nd percentile
- 2026-07-28 15:32 UTCEPSS rescoreEPSS 5.9% · 92nd percentile
- 2026-07-25 14:14 UTCEPSS rescoreEPSS 3.4% · 87th percentile
- 2026-07-24 14:14 UTCEPSS rescoreEPSS 3.4% · 87th percentile
- 2026-07-23 14:15 UTCEPSS rescoreEPSS 3.4% · 87th percentile
- 2026-07-23 01:48 UTCEG score recompute
- 2026-07-22 22:32 UTCEG score recompute
- 2026-07-22 14:05 UTCEPSS rescoreEPSS 3.5% · 87th percentile
- 2026-07-21 15:22 UTCEPSS rescoreEPSS 3.5% · 87th percentile
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownDebian:10:python3.7
Same vendor
7 shownredhat:RHSA-2023:0833 · redhat:RHSA-2022:6766 · redhat:RHSA-2024:0430
Frequently asked(5)
What is CVE-2020-10735?
When was the CVE record for CVE-2020-10735 published?
Is CVE-2020-10735 actively exploited?
What is the CVSS score of CVE-2020-10735?
How do I remediate CVE-2020-10735?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2020-10735
Is Your Infrastructure Affected by CVE-2020-10735?
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