CVE-2026-40528

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.

CVSS v3 3.8 LOW

3.8^/10

CVSS v3 : LOW

Vector :

Exploitability : 0.4 / Impact : 3.4

Attack Vector PHYSICAL

Attack Complexity HIGH

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
https://github.com/OpenSC/OpenSC/commit/0358817ec74aeca654f83e7709c7720b14c5db59	Patch
https://www.vulncheck.com/advisories/opensc-buffer-overrun-in-do-key-value-via-profile-c	Third Party Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:opensc_project:opensc:*:*:*:*:*:*:*:*

History

03 Jun 2026, 14:28

Type	Values Removed	Values Added
References	~~() https://github.com/OpenSC/OpenSC/commit/0358817ec74aeca654f83e7709c7720b14c5db59 -~~	() https://github.com/OpenSC/OpenSC/commit/0358817ec74aeca654f83e7709c7720b14c5db59 - Patch
References	~~() https://www.vulncheck.com/advisories/opensc-buffer-overrun-in-do-key-value-via-profile-c -~~	() https://www.vulncheck.com/advisories/opensc-buffer-overrun-in-do-key-value-via-profile-c - Third Party Advisory
CPE		cpe:2.3:a:opensc_project:opensc::::::::
First Time		Opensc Project Opensc Project opensc

29 May 2026, 14:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-05-29 14:16

Updated : 2026-06-03 14:28

NVD link : CVE-2026-40528

Mitre link : CVE-2026-40528

CVE.ORG link : CVE-2026-40528

JSON object : View

Products Affected

opensc_project

opensc

CWE

CWE-121

Stack-based Buffer Overflow

CWE-122

Heap-based Buffer Overflow

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