Is CVE-2026-42886 actively exploited?

No active exploitation of CVE-2026-42886 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-42886 be exploited remotely?

Yes. CVE-2026-42886 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-42886?

CVE-2026-42886 has a CVSS score of 4.9 (MEDIUM).

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MEDIUM

CVE-2026-42886

CWE-409Published: May 11, 2026· Updated: May 12, 2026

4.9

CVSS v3.1

EPSS:0.04%probability of exploitation in 30 daysPercentile:10.9th

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.

NVD Source

Technical Analysis

CVE-2026-42886 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires high privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 4.9.