PT-2026-44841 · Opensc · Opensc

Nicholas Carlini · CVE-2026-40528 · Published 2026-05-29 · Updated 2026-07-21

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions OpenSC versions prior to 0.27.0

Description A stack and heap buffer overrun occurs in the do key value() function within src/pkcs15init/profile.c. This issue allows memory corruption when a crafted profile configuration file is supplied. During the invocation of pkcs15-init, a key value entry starting with '=' followed by more than the size of keybuf is copied into keybuf using memcpy without a length check.

Recommendations Update to version 0.27.0 or apply the fix from commit 0358817.

Exploit

Fix

Stack Overflow

Heap Based Buffer Overflow

Weakness Enumeration

CWE-121

CWE-122

Related Identifiers

CVE-2026-40528

OPENSUSE-SU-2026:11022-1

SUSE-SU-2026:22103-1

SUSE-SU-2026:22139-1

SUSE-SU-2026:2657-1

SUSE-SU-2026:2697-1

Affected Products

Opensc

References · 29

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40528.json · Exploit
• https://github.com/OpenSC/OpenSC/commit/0358817ec74aeca654f83e7709c7720b14c5db59 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2026:22139-1 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2026-40528 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:2697-1 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2026:11022-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:2657-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:22103-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2026-40528 · Security Note
• https://github.com/OpenSC/OpenSC · Note
• https://suse.com/security/cve/CVE-2025-66037 · Note
• https://suse.com/support/update/announcement/2026/suse-su-20262657-1 · Note
• https://suse.com/security/cve/CVE-2026-10275 · Note
• https://suse.com/security/cve/CVE-2025-49010 · Note
• https://vulncheck.com/advisories/opensc-buffer-overrun-in-do-key-value-via-profile-c · Note