Which products and versions are affected by CVE-2022-0432?

Affected: Mastodon (Joinmastodon); mastodon/mastodon versions >= unspecified. The full list is in the CVE brief.

Is CVE-2022-0432 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2022-0432 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2022-0432?

No public exploit code is known.

Is there a fix for CVE-2022-0432?

Fixed versions are available, including Mastodon 3.5.0, mastodon/mastodon 3.5.0.

How urgently should CVE-2022-0432 be patched?

Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

Request A Demo

Vulnerability Intelligence

CVE-2022-0432

Medium

Prototype Pollution in GitHub repository mastodon/mastodon prior to 3.5.0.

Published Feb 2, 2022 · Updated Sep 10, 2026 · Also known as BIT-mastodon-2022-0432

Key Facts

Routine patching

CVE-2022-0432 is a medium-severity vulnerability (CVSS 6.1 v3.1) affecting Mastodon (Joinmastodon), mastodon/mastodon.
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 4.4% probability of exploitation in the next 30 days.
Fixed versions are available, including Mastodon 3.5.0, mastodon/mastodon 3.5.0.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

CVSS v3.1

6.1

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

EPSS (30-day exploit likelihood)

4.4%

Higher than 91.2% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

None known

Get the full CVE-2022-0432 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Prototype Pollution in GitHub repository mastodon/mastodon prior to 3.5.0.

Affected Products

3 affected entries in total

Product	Affected versions	Fixed in
MastodonJoinmastodon	See advisory	3.5.0
mastodon/mastodon	>= unspecified	3.5.0

Patched Releases

Mastodon

3.5.0

mastodon/mastodon

3.5.0

Timeline

Publicly disclosed
Feb 2, 2022
Last updated
Sep 10, 2026

Weakness Type

CWE-1321 Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

References

FAQ

Common Questions.

Prototype Pollution in GitHub repository mastodon/mastodon prior to 3.5.0.
Affected: Mastodon (Joinmastodon); mastodon/mastodon versions >= unspecified. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Mastodon 3.5.0, mastodon/mastodon 3.5.0.
Brandefense priority: routine patching, as no exploitation is known and its severity is moderate or low.

Is CVE-2022-0432 Running On Your Attack Surface?

Brandefense maps vulnerabilities like this one to your internet-facing assets and tells you exactly where to patch.