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

Quick assessment

Affected
advplyr audiobookshelf
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 4.9 · Medium EPSS 0.44% · P36

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
advplyr audiobookshelf < 2.33.2 affected
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对高度压缩数据的处理不恰当(数据放大攻击)
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
advplyr audiobookshelf < 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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Vendor Advisories for CVE-2026-42886 (1)

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

CVE-2026-42883 6.5 MEDIUM Audiobookshelf: Cross-library file exfiltration via unscoped bulk download endpoint
CVE-2026-42887 4.5 MEDIUM Audiobookshelf: Stored Cross-Site Scripting in Login Page Custom Message
CVE-2026-42885 4.3 MEDIUM Audiobookshelf: Path prefix bypass in filesystem existence check leaks out-of-scope file e
CVE-2026-42884 4.3 MEDIUM Audiobookshelf: Collection endpoints bypass library access controls exposing restricted li
CVE-2026-42888 Audiobookshelf: 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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