Vulnerability · Published May 11, 2026 · Assigned by GitHub_M
CVE-2026-42886Audiobookshelf: Memory amplification DoS via oversized compressed details entry in backup upload
Medium 4.9
In plain English
A medium-severity security flaw in audiobookshelf from advplyr. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).
Official description
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 products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| advplyr | audiobookshelf | < 2.33.2 |
Weakness: CWE-409 · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H