No exploitation reportedFix available

CVE-2020-8252

Q: Is CVE-2020-8252 actively exploited?

Active exploitation of CVE-2020-8252 has not been confirmed. Its EPSS score was 0.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-8252?

CVE-2020-8252 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2020-09-18
Fixed in14.9.0 · 12.18.4 · 10.22.1
WeaknessCWE-120

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

The implementation of realpath in libuv < 10.22.1, < 12.18.4, and < 14.9.0 used within Node.js incorrectly determined the buffer size which can result in a buffer overflow if the resolved path is longer than 256 bytes.

Timeline

dates in UTC

2020-09-1821:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 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-2020-8252?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-8252?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Node.js

Branch	Affected	Fixed in	Source
14.x	≥ 14.0.0, < 14.9.0	14.9.0	NVD
12.x	≥ 12.0.0, < 12.18.4	12.18.4	NVD
10.x	≥ 10.0.0, < 10.22.1	10.22.1	NVD

Fedoraproject fedora

Branch	Affected	Fixed in	Source
33.x	= 33	no fix published	NVD

Opensuse leap

Branch	Affected	Fixed in	Source
15.2	= 15.2	no fix published	NVD

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.

Vendor advisories

RHSA-2021:0548 Red Hat Product Security30 products fixed
Red Hat Security Advisory: nodejs:10 security update
RHSA-2021:0521 Red Hat Product Security48 products fixed
Red Hat Security Advisory: rh-nodejs10-nodejs security update
RHSA-2020:5086 Red Hat Product Security52 products fixed
Red Hat Security Advisory: rh-nodejs12-nodejs security update
RHSA-2020:4903 Red Hat Product Security30 products fixed
Red Hat Security Advisory: nodejs:12 security and bug fix update
RHSA-2020:4272 Red Hat Product Security30 products fixed
Red Hat Security Advisory: nodejs:12 security and bug fix update

Full record on NVD

Fix

Update Node.js to 14.9.0 · 12.18.4 · 10.22.1
Vendor fix Red Hat Product Security RHSA-2021:0548 · 30 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258

Advisories and patches

nodejs.orgVendor Advisory

Detection

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

Sources

NVDCVSS 3.17.8read 2026-10-23
NVDCVSS 2.04.6read 2026-10-23
CNAweakness (CWE)CWE-120read 2026-10-23
NVDweakness (CWE)CWE-120read 2026-10-23
FIRST EPSSEPSS score0.7 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Published: 2020-09-18
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-8252?

Is CVE-2020-8252 actively exploited?

Active exploitation of CVE-2020-8252 has not been confirmed. Its EPSS score was 0.7% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-8252?

CVE-2020-8252 has a CVSS v3 base score of 7.8 (HIGH severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

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