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CVE-2026-42886— Audiobookshelf: Memory amplification DoS via oversized compressed details entry in backup upload

CVSS 4.9 · Medium EPSS 0.04% · P11

Possible ATT&CK Techniques 1AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProductVersion RangeStatus
advplyraudiobookshelf< 2.33.2affected
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I. Basic Information for CVE-2026-42886

Vulnerability Information
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Vulnerability Title
Audiobookshelf: Memory amplification DoS via oversized compressed details entry in backup upload
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: NVD (National Vulnerability Database)
Vulnerability Title
Audiobookshelf 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Audiobookshelf是Audiobookshelf开源的一个自托管的有声读物和播客服务器。 Audiobookshelf 2.32.2之前版本存在安全漏洞，该漏洞源于备份上传端点未限制解压大小，导致管理员用户上传特制ZIP文件造成内存耗尽，导致服务崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
advplyraudiobookshelf < 2.33.2 -

II. Public POCs for CVE-2026-42886

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III. Intelligence Information for CVE-2026-42886

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Same Patch Batch · advplyr · 2026-05-11 · 6 CVEs total

CVE-2026-428836.5 MEDIUMAudiobookshelf: Cross-library file exfiltration via unscoped bulk download endpoint
CVE-2026-428874.5 MEDIUMAudiobookshelf: Stored Cross-Site Scripting in Login Page Custom Message
CVE-2026-428854.3 MEDIUMAudiobookshelf: Path prefix bypass in filesystem existence check leaks out-of-scope file e
CVE-2026-428844.3 MEDIUMAudiobookshelf: Collection endpoints bypass library access controls exposing restricted li
CVE-2026-42888Audiobookshelf: Path Traversal vulnerability in the audiobookshelf project

IV. Related Vulnerabilities

Same product: audiobookshelf
Same vendor: advplyr
Same weakness: CWE-409

V. Comments for CVE-2026-42886

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