CVE-2026-40260 PUBLISHED

pypdf: Manipulated XMP metadata entity declarations can exhaust RAM

Assigner: GitHub_M
Reserved: 10.04.2026 Published: 16.04.2026 Updated: 16.04.2026

pypdf is a free and open-source pure-python PDF library. In versions prior to 6.10.0, manipulated XMP metadata entity declarations can exhaust RAM. An attacker who exploits this vulnerability can craft a PDF which leads to large memory usage. This requires parsing the XMP metadata. This issue has been fixed in version 6.10.0.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CVSS Score: 6.9

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	Low	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	py-pdf
Product	pypdf
Versions	Version < 6.10.0 is affected

References

Problem Types

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