CVE-2026-40528 | OpenSC before 0.27.0, fixed in commit 0358817, contains a st… | CVSS 3.8 LOW

Description

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.

Metadata

CVE ID: CVE-2026-40528
State: PUBLISHED
Assigner: VulnCheck
Reserved: 2026-04-13 20:29 UTC
Published: 2026-05-29 13:38 UTC
Last updated: 2026-05-29 13:58 UTC
Primary CWE: CWE-121
Stack-based Buffer Overflow
Vendor / Product: OpenSC / OpenSC
Sources: cve.org · NVD

Severity & Metrics

3.8 LOW CVSS 3.1

CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
OpenSC	OpenSC	—	0 < 0.27.0, 0 < 0358817ec74aeca654f83e7709c7720b14c5db59

Weakness (CWE)

CWE	Source	Description
CWE-121	cna	Stack-based Buffer Overflow
CWE-122	cna	Heap-based Buffer Overflow

CVSS scores (2)

Score	Severity	Version	Source	Vector
3.8	LOW	3.1	cna	CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
1.0	LOW	4.0	cna	CVSS:4.0/AV:P/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

References (2)