Deserialization of Untrusted Data in pdfminer.six - CVE-2025-64512
Published: November 27, 2025 / Updated: January 9, 2026
Vulnerability identifier: #VU118799
CSH Severity: High
CVSS v4: 8.4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2025-64512
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code on the target system.
The vulnerability exists due to insecure input validation when processing serialized data in CMapDB._load_data(). A remote attacker can trick the victim into opening a specially crafted PDF file and execute arbitrary code on the target system.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
Affected software
pdfminer.six
Debian Linux
Fedora
python-pdfminer
pdfminer (Debian package)
Debian Linux
Fedora
python-pdfminer
pdfminer (Debian package)
How to mitigate CVE-2025-64512
Install updates from vendor's website.
pdfminer.six - update to 20251107
python-pdfminer - update to 20220319-3.el8
pdfminer (Debian package) - addressed in versions 20221105+dfsg-1.1~deb12u1, 20221105+dfsg-1.1~deb13u1
python-pdfminer - update to 20220319-3.el8
pdfminer (Debian package) - addressed in versions 20221105+dfsg-1.1~deb12u1, 20221105+dfsg-1.1~deb13u1