Python 2.7.14 is vulnerable to a Heap-Buffer-Overflow as well as a Heap-Use-After-Free. Python versions prior to 2.7.14 may also be vulnerable and it appears that Python 2.7.17 and prior may also be vulnerable however this has not been confirmed. The vulnerability lies when multiply threads are handling large amounts of data. In both cases there is essentially a race condition that occurs. For the Heap-Buffer-Overflow, Thread 2 is creating the size for a buffer, but Thread1 is already writing to the buffer without knowing how much to write. So when a large amount of data is being processed, it is very easy to cause memory corruption using a Heap-Buffer-Overflow. As for the Use-After-Free, Thread3->Malloc->Thread1->Free's->Thread2-Re-uses-Free'd Memory. The PSRT has stated that this is not a security vulnerability due to the fact that the attacker must be able to run code, however in some situations, such as function as a service, this vulnerability can potentially be used by an attacker to violate a trust boundary, as such the DWF feels this issue deserves a CVE.
CVE-2018-1000030
“—” beside the score: it is equal to NVD's CVSS score.
Score 3.6 from GitHub Security Advisory (severity: LOW) published 2022-05-13. NVD baseline CVSS 3.6; sources differ by 0.0.
- Lower severity and no public exploit yet
A fix is available — apply it.
- CVSS v3
- 3.6
- EG Score
- 3.6LOWmedium confidence
- EG Risk
- 17EG Risk 17/100
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)Severity36% × 45%Impact severity (EG Severity): CVSS 3.6 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation1.2% × 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
- 1.2%
- EPSS %ILE
- 67th
- 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 (3.6): severity, escalated by confirmed exploitation. This CVE's 3.6 is its impact severity (EG Severity), not escalated.
- EG Severity
- 3.6 LOWCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 1.2% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-17). 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
February 8, 2018
Last Modified
October 8, 2026
References (7)
- MITRE · CVE Programhttps://bugs.python.org/issue31530Issue Tracking · Patch · Vendor Advisory
- MITRE · CVE Programhttps://drive.google.com/file/d/1oyR9DAZjZK_SCn3mor6NRAYLJS6ueXaY/viewThird Party Advisory
- MITRE · CVE Programhttps://security.gentoo.org/glsa/201811-02Third Party Advisory
- MITRE · CVE Programhttps://usn.ubuntu.com/3817-1/Third Party Advisory
- MITRE · CVE Programhttps://usn.ubuntu.com/3817-2/Third Party Advisory
- MITRE · CVE Programhttps://www.dropbox.com/sh/sj3ee7xv55j36k7/AADwP-YfOYikBMuy32e0uvPFa?dl=0Permissions Required
- MITRE · CVE Programhttps://www.oracle.com/security-alerts/cpujan2020.htmlThird Party Advisory
Vendor Advisories for CVE-2018-1000030(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Patch Availability(2)
| Vendor / Ecosystem | Fix (by version range) / Patch | Released | Source |
|---|---|---|---|
| ubuntu | python2.7 (2.7.3-0ubuntu3.11) @ precise | 2026-10-08 | ubuntu |
| ubuntu | python3.5-venv (3.5.2-2ubuntu0~16.04.5) @ xenial | 2026-10-08 | ubuntu |
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
(1 across 1 ecosystem)
Debian:11(1)
| Package | Vulnerable range | Fix by version range | Dependents |
|---|---|---|---|
| python2.7 | — |
| — |
Weakness Classification(2)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
All Vendor Advisories
(2)
Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.
Data Freshness Timeline
(refreshed 8× in last 7d / 35× 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 89 of 172 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. 11 repeat rows among the latest 100 are merged into the row they repeat. The 83 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 1.2% · 67th percentile
- 2026-10-22 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-10-21 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-10-20 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-10-19 16:26 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-10-18 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-10-18 10:24 UTCEG score recompute
- 2026-10-17 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-10-16 16:29 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-10-15 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-10-14 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-10-13 16:27 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-10-12 20:22 UTCEG score recompute
- 2026-10-12 16:28 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-10-12 00:45 UTCEG score recompute
- 2026-10-11 13:41 UTCEPSS rescoreEPSS 1.2% · 67th percentile
- 2026-10-10 19:55 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-10-09 20:02 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-10-08 21:26 UTCEG score recompute
- 2026-10-08 21:26 UTCVendor advisory
- 2026-10-08 21:26 UTCGHSA enrichmentGHSA-rwj4-fxr5-gh64 · GitHub severity LOW · GitHub CVSS 3.6
- 2026-10-08 16:36 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-10-07 23:41 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-10-06 15:12 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-10-05 17:39 UTCEPSS rescoreEPSS 1.2% · 66th percentile
Show 64 moreShow fewer
- 2026-10-04 23:18 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-10-03 14:21 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-30 14:59 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-30 09:50 UTCEG score recompute
- 2026-09-29 10:22 UTCOSV refresh
- 2026-09-28 13:45 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-27 13:40 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-26 15:53 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-26 00:19 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-24 13:59 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-23 13:42 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-21 20:27 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-09-20 20:09 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-19 15:36 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-17 19:22 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-15 03:05 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-13 16:42 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-12 14:56 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-09-11 09:31 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-09-09 18:53 UTCOSV refresh
- 2026-09-07 15:56 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-09-05 15:24 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-09-04 13:56 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-09-04 05:02 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-09-02 14:07 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-09-01 03:31 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-30 19:13 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-28 21:36 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-27 14:21 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-26 14:41 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-25 13:44 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-23 00:14 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-22 23:37 UTCOSV refresh
- 2026-08-21 23:44 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-19 16:59 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-18 13:43 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-16 14:51 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-16 02:10 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-08-15 01:26 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-08-12 13:46 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-08-09 13:42 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-08-08 16:32 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-08-07 16:22 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-08-07 02:26 UTCOSV refresh
- 2026-08-06 13:42 UTCEPSS rescoreEPSS 1.2% · 66th percentile
- 2026-08-05 19:13 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-02 02:23 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-08-01 04:12 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-07-30 16:24 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-07-30 01:26 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-07-28 15:32 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-07-26 14:51 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-07-23 14:15 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-07-23 01:31 UTCEG score recompute
- 2026-07-22 22:11 UTCEG score recompute
- 2026-07-22 14:04 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-07-21 18:18 UTCOSV refresh
- 2026-07-21 15:21 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-07-20 17:04 UTCEPSS rescoreEPSS 1.2% · 65th percentile
- 2026-07-19 02:26 UTCEPSS rescoreEPSS 1.3% · 66th percentile
- 2026-07-18 10:01 UTCEPSS rescoreEPSS 1.3% · 66th percentile
- 2026-07-16 16:59 UTCEPSS rescoreEPSS 1.3% · 66th percentile
- 2026-07-15 16:54 UTCEPSS rescoreEPSS 1.3% · 66th percentile
- 2026-07-15 01:56 UTCEPSS rescoreEPSS 1.3% · 66th percentile
Related CVEs(same product + same vendor + same CWE)
Same product
10 shownDebian:11:python2.7
- CVE-2026-7210NVD 7.5EG 9.8CRITICAL
- CVE-2025-13462NVD 3.3EG 9.8CRITICAL
- CVE-2022-48565EG 9.8EPSS p92CRITICAL
- CVE-2015-20107NVD 7.6EG 9.8CRITICAL
- CVE-2021-3177EG 9.8EPSS p98CRITICAL
- CVE-2020-27619EG 9.8EPSS p95CRITICAL
- CVE-2014-4650EG 9.8EPSS p98CRITICAL
- CVE-2019-10160EG 9.8EPSS p92CRITICAL
- CVE-2019-9636EG 9.8EPSS p95CRITICAL
- CVE-2018-1000802EG 9.8EPSS p97CRITICAL
Same vendor
4 shownubuntu:USN-3817-1
Same CWE
10 shownCWE-416 · CWE-787
Frequently asked(5)
What is CVE-2018-1000030?
When was CVE-2018-1000030 made public?
Is CVE-2018-1000030 actively exploited?
What is the CVSS score of CVE-2018-1000030?
How do I remediate CVE-2018-1000030?
Dependency Blast Radius
See which npm, PyPI, Go, and Maven packages are affected by CVE-2018-1000030
Is Your Infrastructure Affected by CVE-2018-1000030?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.