CVE-2026-42886
Audiobookshelf: Memory amplification DoS via oversized compressed details entry in backup upload
CVSS Score
4.9
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-409 |
| Vendor | advplyr |
| Product | audiobookshelf |
| Published | May 11, 2026 |
| Last Updated | May 12, 2026 |
Stay Ahead of the Next One
Get instant alerts for advplyr audiobookshelf
Be the first to know when new medium vulnerabilities affecting advplyr audiobookshelf are published — delivered to Slack, Telegram or Discord.
Get Free Alerts →
Free · No credit card · 60 sec setup
CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
High
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
advplyr / audiobookshelf
< 2.33.2