Inefficient Algorithmic Complexity in PyPDF - CVE-2026-49460
Published: October 21, 2026
Vulnerability identifier: #VU156647
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-49460
CWE-ID: CWE-407
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause excessive resource consumption and potentially a denial of service.
The vulnerability exists due to inefficient decoding in the pypdf FlateDecode PNG predictor processing component when decoding PDF streams that use PNG predictors. A remote attacker can supply specially crafted PDF data to trigger excessive processing and potentially cause a denial of service.
Affected software
PyPDF
How to mitigate CVE-2026-49460
Install security update from vendor's website.
PyPDF - update to 6.12.2