SB20260410100 - XML Entity Expansion in PyPDF

Description

This security bulletin contains information about 1 vulnerability.

1) XML Entity Expansion (CVE-ID: N/A)

CWE-ID: CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

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 excessive memory consumption.

The vulnerability exists due to improper restriction of recursive entity references in DTDs in the XMP metadata parser when parsing XMP metadata from a PDF file. A remote attacker can supply a specially crafted PDF to cause excessive memory consumption.

Exploitation requires the application to parse the XMP metadata.

Remediation

Install update from vendor's website.

References

• https://github.com/py-pdf/pypdf/security/advisories/GHSA-3crg-w4f6-42mx
• https://github.com/advisories/GHSA-3crg-w4f6-42mx