SB2026011230 - Multiple vulnerabilities in PyPDF

Description

This security bulletin contains information about 2 vulnerabilities.

1) Resource exhaustion (CVE-ID: CVE-2026-22690)

CWE-ID: CWE-400 - Resource exhaustion

CVSSv4: CVSS:4.0/AV:L/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 perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when parsing PDF files. A remote attacker can trigger resource exhaustion and perform a denial of service (DoS) attack.

2) Inefficient regular expression complexity (CVE-ID: CVE-2026-22691)

CWE-ID: CWE-1333 - Inefficient Regular Expression Complexity

CVSSv4: CVSS:4.0/AV:L/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 perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient input validation when processing startxref entries with a regular expressions. A remote attacker can pass specially crafted PDF file containing multiple whitespace characters and perform regular expression denial of service (ReDos) attack.

Remediation

Install update from vendor's website.

References

• https://github.com/py-pdf/pypdf/security/advisories/GHSA-4xc4-762w-m6cg
• https://github.com/py-pdf/pypdf/pull/3594
• https://github.com/py-pdf/pypdf/security/advisories/GHSA-4f6g-68pf-7vhv