CVE-2026-27026 (Medium) detected in pypdf-6.6.2-py3-none-any.whl

[mend-bolt-for-github]

CVE-2026-27026 - Medium Severity Vulnerability

Vulnerable Library - pypdf-6.6.2-py3-none-any.whl

A pure-python PDF library capable of splitting, merging, cropping, and transforming PDF files

Library home page: https://files.pythonhosted.org/packages/7d/be/549aaf1dfa4ab4aed29b09703d2fb02c4366fc1f05e880948c296c5764b9/pypdf-6.6.2-py3-none-any.whl

Path to dependency file: /extract-pdf-text/requirements.txt

Path to vulnerable library: /tmp/ws-ua_20260220141226_ZZFSBE/python_GNCKKA/202602201412321/env/lib/python3.9/site-packages/pypdf-6.6.2.dist-info

Dependency Hierarchy:

• ❌ pypdf-6.6.2-py3-none-any.whl (Vulnerable Library)

Found in HEAD commit: 173a4b19d88f4906c34e6f2cd6aabc948152143b

Found in base branch: main

Vulnerability Details

Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires a malformed "/FlateDecode" stream, where the byte-by-byte decompression is used. Patches This has been fixed in "pypdf==6.7.1" (https://github.com/py-pdf/pypdf/releases/tag/6.7.1). Workarounds If you cannot upgrade yet, consider applying the changes from PR "#3644" (py-pdf/pypdf#3644).

Publish Date: 2026-02-19

URL: CVE-2026-27026

CVSS 3 Score Details (6.2)

Base Score Metrics:

• Exploitability Metrics:
  • Attack Vector: Local
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: None
  • Scope: Unchanged
• Impact Metrics:
  • Confidentiality Impact: None
  • Integrity Impact: None
  • Availability Impact: High

For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Origin: GHSA-9mvc-8737-8j8h

Release Date: 2026-02-19

Fix Resolution: 6.7.1

---

Step up your Open Source Security Game with Mend here