Quick answers
- Is CVE-2026-42886 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-42886 being exploited in the wild.
- How severe is CVE-2026-42886?
- Medium severity, with a CVSS score of 4.9, published 11 May 2026.
- Which products and versions are affected?
- Advplyr Audiobookshelf < 2.32.2.
- Is there a fix for CVE-2026-42886?
- A patch was published on 2026-05-11: Fix confirmed in version 2.32.2 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-42886 attacked?
- It is attacked over the network, in a network appliance.
- Am I affected by CVE-2026-42886?
- Check whether you run Advplyr Audiobookshelf at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
A memory amplification vulnerability exists in the `POST /api/backups/upload` endpoint of Audiobookshelf. The `uploadBackup` handler in `BackupManager.js` utilizes `zip.entryData()` to decompress the 'details' entry of an uploaded `.audiobookshelf` ZIP file directly into a Buffer without size limits. Furthermore, the `fileUpload()` middleware in `Server.js` lacks a `fileSize` limit, allowing arbitrarily large files to be processed. An attacker with administrative privileges can upload a ZIP file containing highly compressed data (a 'zip bomb' variant) that expands to gigabytes in memory, leading to an Out-of-Memory (OOM) crash of the Node.js process. This issue is fixed in version 2.32.2.
Affected products
- advplyr Audiobookshelf < 2.32.2
Timeline
- 2026-04-28: advisory: GitHub Security Advisory published
- 2026-05-11: disclosed: NVD publication date
- 2026-05-11: patched: Fix confirmed in version 2.32.2