CVE-2020-36632: A vulnerability, which was classified as critical, was found in hughsk flat up to 5.0.0

Q: How do I fix CVE-2020-36632?

flat: upgrade to 5.0.1. Exact commands for each OS are on this page.

Q: Is CVE-2020-36632 being exploited?

CVE-2020-36632 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2020-36632 affect?

CVE-2020-36632 affects flat. Severity is medium (CVSS 6.3). A vulnerability, which was classified as critical, was found in hughsk flat up to 5.0.0. This affects the function unflatten of the file index.js. The manipulation leads to improperly controlled modification of object prototype attributes (

Q: How urgent is CVE-2020-36632?

Priority 39/100. No elevated risk signals yet.

Routine

MEDIUM 6.3UPGRADE

CVE-2020-36632 is a medium-severity flaw (CVSS 6.3) affecting flat. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability, which was classified as critical, was found in hughsk flat up to 5.0.0. This affects the function unflatten of the file index.js. The manipulation leads to improperly controlled modification of object prototype attributes ('prototype pollution'). It is possible to initiate the attack remotely. Upgrading to version 5.0.1 is able to address this issue. The name of the patch is 20ef0ef55dfa028caddaedbcb33efbdb04d18e13. It is recomme

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.2% (top 32%)
CISA exploited list	No
Weakness	CWE-1321
Published	2022-12-25
Last modified	2026-06-17

Publisher (CNA): VulDB · Vendor: flat project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-12-25 20:15 UTCPublished CVE record published
2026-06-17 03:15 UTCUpdated Record last modified

flat project flat UPGRADE

Affected: < 5.0.1

Fixed in: 5.0.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy flat || rpm -q flat || flat --version

2. UPGRADE to 5.0.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade flat

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade flat

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2020-36632?

flat: upgrade to 5.0.1. Exact commands for each OS are on this page.

Is CVE-2020-36632 being exploited?

CVE-2020-36632 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2020-36632 affect?

CVE-2020-36632 affects flat. Severity is medium (CVSS 6.3). A vulnerability, which was classified as critical, was found in hughsk flat up to 5.0.0. This affects the function unflatten of the file index.js. The manipulation leads to improperly controlled modification of object prototype attributes (

How urgent is CVE-2020-36632?

Priority 39/100. No elevated risk signals yet.

References

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