CVE-2026-40528: Opensc Project Opensc

High severity, CVSS 7.8. EPSS: 0.2% chance of exploitation in the next 30 days.

OpenSC before 0.27.0, fixed in commit 0358817, contains a stack and heap buffer overrun vulnerability in the do_key_value() function in src/pkcs15init/profile.c that allows attackers to corrupt memory by supplying a crafted profile configuration file. During pkcs15-init invocation, a key value entry beginning with '=' followed by more than sizeof(keybuf) characters is copied into keybuf via memcpy without a length check, causing both stack and heap buffer overruns.

Affected products

• Opensc Project Opensc: before 0.27.0 (fixed in 0.27.0)

Published 2026-05-29. Last modified 2026-07-21.