CVE-2026-42886: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) in advplyr audiobookshelf
CVE-2026-42886 is a medium severity vulnerability in advplyr's audiobookshelf prior to version 2.33.2. The POST /api/backups/upload endpoint decompresses a details entry from an uploaded ZIP file entirely into memory without limiting decompressed size. An admin user can exploit this by uploading a crafted ZIP with a highly compressed details entry that expands to consume excessive memory, causing the server process to crash due to out-of-memory conditions. This is a denial-of-service vulnerability related to improper handling of highly compressed data (CWE-409). The issue is fixed in version 2.33.2. No known exploits are reported in the wild.
AI Analysis
Technical Summary
Audiobookshelf versions before 2.33.2 have a vulnerability in the backup upload API endpoint where the server decompresses the details entry of an uploaded ZIP file fully into memory without size limits. This allows an authenticated admin user to upload a specially crafted ZIP file containing a highly compressed details entry that decompresses to a very large size, causing excessive memory consumption and crashing the server process. This is classified as CWE-409: Improper Handling of Highly Compressed Data leading to data amplification and denial of service. The vulnerability has a CVSS 3.1 base score of 4.9, reflecting a medium severity denial-of-service impact with no confidentiality or integrity impact. The vulnerability is fixed in audiobookshelf version 2.33.2.
Potential Impact
An authenticated administrator can cause a denial-of-service condition by uploading a crafted ZIP file that decompresses to consume excessive memory, crashing the audiobookshelf server process. There is no impact on confidentiality or integrity. The server becomes unavailable until restarted or remediated.
Mitigation Recommendations
This vulnerability is fixed in audiobookshelf version 2.33.2. Users should upgrade to version 2.33.2 or later to remediate this issue. Since the vendor advisory states the fix is available in 2.33.2, applying this official update is the recommended mitigation. No additional mitigations are indicated.
CVE-2026-42886: CWE-409: Improper Handling of Highly Compressed Data (Data Amplification) in advplyr audiobookshelf
Description
CVE-2026-42886 is a medium severity vulnerability in advplyr's audiobookshelf prior to version 2.33.2. The POST /api/backups/upload endpoint decompresses a details entry from an uploaded ZIP file entirely into memory without limiting decompressed size. An admin user can exploit this by uploading a crafted ZIP with a highly compressed details entry that expands to consume excessive memory, causing the server process to crash due to out-of-memory conditions. This is a denial-of-service vulnerability related to improper handling of highly compressed data (CWE-409). The issue is fixed in version 2.33.2. No known exploits are reported in the wild.
CVSS v3.1
Score 4.9medium
Affected software
pkg:github/advplyr/audiobookshelfRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Audiobookshelf versions before 2.33.2 have a vulnerability in the backup upload API endpoint where the server decompresses the details entry of an uploaded ZIP file fully into memory without size limits. This allows an authenticated admin user to upload a specially crafted ZIP file containing a highly compressed details entry that decompresses to a very large size, causing excessive memory consumption and crashing the server process. This is classified as CWE-409: Improper Handling of Highly Compressed Data leading to data amplification and denial of service. The vulnerability has a CVSS 3.1 base score of 4.9, reflecting a medium severity denial-of-service impact with no confidentiality or integrity impact. The vulnerability is fixed in audiobookshelf version 2.33.2.
Potential Impact
An authenticated administrator can cause a denial-of-service condition by uploading a crafted ZIP file that decompresses to consume excessive memory, crashing the audiobookshelf server process. There is no impact on confidentiality or integrity. The server becomes unavailable until restarted or remediated.
Mitigation Recommendations
This vulnerability is fixed in audiobookshelf version 2.33.2. Users should upgrade to version 2.33.2 or later to remediate this issue. Since the vendor advisory states the fix is available in 2.33.2, applying this official update is the recommended mitigation. No additional mitigations are indicated.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-30T18:49:06.712Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a028779cbff5d86108b80b9
Added to database: 05/12/2026, 01:50:49 UTC
Last enriched: 05/19/2026, 11:04:56 UTC
Last updated: 07/04/2026, 20:51:24 UTC
Views: 101
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