PT-2025-48100 · Pypi+1 · Pypdf+1

CVE-2025-66019 · Published 2025-10-22 · Updated 2026-07-07

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions pypdf versions prior to 6.4.0

Description pypdf is a free and open-source pure-python PDF library. An attacker can create a malicious PDF file that causes excessive memory consumption, up to 1 GB per stream, when parsing the content stream of a page using the LZWDecode filter.

Recommendations Update to version 6.4.0 or later.

Exploit

Fix

DoS

Resource Exhaustion

Weakness Enumeration

CWE-409

CWE-400

Related Identifiers

BDU:2026-07343

CVE-2025-66019

GHSA-M449-CWJH-6PW7

OPENSUSE-SU-2025:15776-1

PYSEC-2026-1832

Affected Products

Red Os

Pypdf

References · 30

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66019.json · Exploit
• https://osv.dev/vulnerability/GHSA-m449-cwjh-6pw7 · Vendor Advisory
• https://osv.dev/vulnerability/PYSEC-2026-1832 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-66019 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-66019 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-66019 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-66019 · Security Note
• https://bdu.fstec.ru/vul/2026-07343 · Security Note
• https://cve.org/CVERecord?id=CVE-2025-66019 · Security Note
• https://osv.dev/vulnerability/openSUSE-SU-2025:15776-1 · Vendor Advisory
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-jfx9-29x2-rv3j · Note
• https://github.com/py-pdf/pypdf/commit/e51d07807ffcdaf18077b9486dadb3dc05b368da · Note
• https://github.com/py-pdf/pypdf/releases/tag/6.4.0 · Note
• https://github.com/py-pdf/pypdf/releases/tag/6.1.3 · Note
• https://github.com/py-pdf/pypdf/pull/3502 · Note