What is CVE-2026-42886?

CVE-2026-42886 is a medium-severity vulnerability in Advplyr Audiobookshelf, classified under Improper Handling of Highly Compressed Data (Data Amplification). CVSS score: 4.9/10. Published 2026-05-11.

How severe is CVE-2026-42886?

Medium severity. CVSS v3 base score is 4.9 out of 10.

Vulnerability in Advplyr Audiobookshelf

CVE-2026-42886

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…

EPSS: 0.000 (15.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.9 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H.

Affected products

Advplyr Audiobookshelf — versions < 2.33.2

Weakness classification (CWE)

CWE-409 — Improper Handling of Highly Compressed Data (Data Amplification)

References

security-advisories@github.com (x_refsource_CONFIRM)

Frequently asked questions

What is CVE-2026-42886?: CVE-2026-42886 is a medium-severity vulnerability in Advplyr Audiobookshelf, classified under Improper Handling of Highly Compressed Data (Data Amplification). CVSS score: 4.9/10. Published 2026-05-11.
How severe is CVE-2026-42886?: Medium severity. CVSS v3 base score is 4.9 out of 10.