pypdf is a free and open-source pure-python PDF library. Prior to 6.7.3, an attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the `xfa` property of a reader or writer and the corresponding stream being compressed using `/FlateDecode`.
This has been fixed in pypdf 6.7.3. As a workaround, apply the patch manually.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/py-pdf/pypdf/commit/7a4c8246ed48d9d328fb596942271da47b6d109c
security-advisories@github.com
https://github.com/py-pdf/pypdf/pull/3658
security-advisories@github.com
https://github.com/py-pdf/pypdf/releases/tag/6.7.3
security-advisories@github.com
https://github.com/py-pdf/pypdf/security/advisories/GHSA-x7hp-r3qg-r3cj
security-advisories@github.com