CVE-2022-21230: Nanohttpd

Medium severity, CVSS 5.5. EPSS: 0.3% chance of exploitation in the next 30 days.

This affects all versions of package org.nanohttpd:nanohttpd. Whenever an HTTP Session is parsing the body of an HTTP request, the body of the request is written to a RandomAccessFile when the it is larger than 1024 bytes. This file is created with insecure permissions that allow its contents to be viewed by all users on the host machine. **Workaround:** Manually specifying the -Djava.io.tmpdir= argument when launching Java to set the temporary directory to a directory exclusively controlled by the current user can fix this issue.

Affected products

• Nanohttpd Nanohttpd: up to and including 2.3.1

Published 2022-05-01. Last modified 2026-06-17.