CVE-2026-82864: Improper Handling of Highly Compressed Data (Data Amplification) in pdfme pdf-lib
Description
pdfme pdf-lib versions before 5.5.10 have a vulnerability in the DecodeStream.ensureBuffer() method that allows denial of service via a decompression bomb in a FlateDecode stream. An attacker can upload a crafted PDF that decompresses to a very large size, exhausting memory and causing crashes or freezes during PDF parsing.
CVSS v4.0
Score 7.1high
Affected software
pdfme
pdf-lib
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-82864 is an unbounded buffer growth vulnerability in pdfme pdf-lib's DecodeStream.ensureBuffer() method affecting versions before 5.5.10. This flaw allows attackers to supply a malicious PDF with a FlateDecode stream that acts as a decompression bomb, causing the library to allocate excessive memory during decompression. The result is denial of service by crashing the Node.js process or freezing browser tabs that parse the PDF.
Potential Impact
The vulnerability enables denial of service by exhausting system memory through decompression of a crafted PDF file. This can disrupt applications using pdfme pdf-lib for PDF parsing, leading to crashes or unresponsive behavior. There is no indication of code execution or data leakage from the provided information.
Mitigation Recommendations
A fix is available in pdfme pdf-lib version 5.5.10. Users should upgrade to version 5.5.10 or later to remediate this vulnerability. No other mitigation guidance is provided or required.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-31T08:37:53.169Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a954466acd9273b49d7ddca
Added to database: 08/31/2026, 09:07:50 UTC
Last enriched: 10/09/2026, 21:24:20 UTC
Last updated: 10/13/2026, 18:57:41 UTC
Views: 71
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