CVE-2026-42886: Audiobookshelf: Memory amplification DoS via oversized compressed details entry in backup upload
Audiobookshelf is a self-hosted audiobook and podcast server. Prior to 2.32.2, the POST /api/backups/upload endpoint decompresses the details entry from an uploaded .audiobookshelf ZIP file entirely into memory using zip.entryData(), with no limit on the decompressed size. The upload middleware also has no file size limit. An admin user can upload a crafted ZIP containing a highly compressed details entry that, when decompressed, consumes hundreds of megabytes or gigabytes of memory, crashing the server process via out-of-memory. This vulnerability is fixed in 2.32.2.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-42886?
CVE-2026-42886 has a critical severity due to the potential for denial of service through memory exhaustion.
How do I fix CVE-2026-42886?
To fix CVE-2026-42886, update Audiobookshelf to version 2.32.2 or later.
What software is affected by CVE-2026-42886?
CVE-2026-42886 affects Audiobookshelf versions prior to 2.32.2.
What vulnerability does CVE-2026-42886 describe?
CVE-2026-42886 describes a vulnerability where the /api/backups/upload endpoint decompresses uploaded ZIP files without size limitations.
Is any user data at risk with CVE-2026-42886?
While CVE-2026-42886 primarily poses a denial of service risk, user data could be indirectly affected if the server becomes unresponsive.