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

No history.

Information

Published : 2026-05-29 14:16

Updated : 2026-07-21 12:10

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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Durante la invocaci\u00f3n de pkcs15-init, una entrada de valor de clave que comienza con '=' seguida de m\u00e1s de sizeof(keybuf) caracteres se copia en keybuf a trav\u00e9s de memcpy sin una verificaci\u00f3n de longitud, causando desbordamientos de b\u00fafer tanto de pila como de mont\u00f3n."}], "lastModified": "2026-07-21T12:10:00.090", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:opensc_project:opensc:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "D890677F-5379-4587-B8E7-D38B02AD525A", "versionEndExcluding": "0.27.0"}], "operator": "OR"}]}], "sourceIdentifier": "disclosure@vulncheck.com"}