SB2026041095 - Resource exhaustion in PyPDF

Description

This security bulletin contains information about 1 vulnerability.

1) Resource exhaustion (CVE-ID: CVE-2025-55197)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to uncontrolled resource consumption in FlateDecode stream processing when parsing a crafted PDF file. A remote attacker can supply a PDF with a malicious cross-reference stream using a series of FlateDecode filters to cause a denial of service.

Simply reading the file is sufficient for exploitation through a malicious cross-reference stream, while other content streams are affected on explicit access.

Remediation

Install update from vendor's website.

References

• https://github.com/py-pdf/pypdf/security/advisories/GHSA-7hfw-26vp-jp8m
• https://github.com/advisories/GHSA-7hfw-26vp-jp8m