pypdf is a free and open-source pure-python PDF library. Prior to version 6.7.5, an attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires accessing a stream which uses the /ASCIIHexDecode filter.
This issue has been patched in version 6.7.5.
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
Low
Partial disruption
CVSS Vector v4.0
Weakness Type (CWE)
References 4
https://github.com/py-pdf/pypdf/commit/648c627d2657447dfb1773412af05a0a5103b98f
security-advisories@github.com
https://github.com/py-pdf/pypdf/pull/3666
security-advisories@github.com
https://github.com/py-pdf/pypdf/releases/tag/6.7.5
security-advisories@github.com
https://github.com/py-pdf/pypdf/security/advisories/GHSA-9m86-7pmv-2852
security-advisories@github.com