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CVE-2020-36632

31
FAUCET Score

CVE-2020-36632 is a critical prototype pollution vulnerability affecting hughsk flat versions up to 5.0.0, specifically within the unflatten function in index.js. This flaw allows for remote, unauthenticated attackers to achieve high impact on confidentiality, integrity, and availability, as indicated by its CVSS score of 9.8. While a patch (version 5.0.1) is available, there is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.0.1CPE matchmatch criteria
cpe:2.3:a:flat_project:flat:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.3MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
LOW
Exploitability Score
2.8
Impact Score
3.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.11%
Probability of exploitation in next 30 days
EPSS Percentile
62.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0111 is in the 48th percentile among its peer group of 36,833 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (6)

github_advisorypatch availablevia nvd_reference
View patch
npmpatch availablevia ghsa
Product: flatFixed in: 1.6.2
npmpatch availablevia ghsa
Product: flatFixed in: 2.0.2
npmpatch availablevia ghsa
Product: flatFixed in: 3.0.1
npmpatch availablevia ghsa
Product: flatFixed in: 4.0.2
npmpatch availablevia ghsa
Product: flatFixed in: 5.0.1

Vendor Advisories (1)

npmGHSA-2j2x-2gpw-g8fmcritical

flat vulnerable to Prototype Pollution

Dec 25, 2022

References

github.com / hughsk/flat/commit/20ef0ef55dfa028caddaedbcb33efbdb04d18e13
PatchThird Party Advisory
github.com / hughsk/flat/issues/105
Issue TrackingThird Party Advisory
github.com / hughsk/flat/pull/106
PatchThird Party Advisory
github.com / hughsk/flat/releases/tag/5.0.1
Release NotesThird Party Advisory
vuldb.com
Third Party Advisory
vuldb.com
Third Party Advisory