CVE-2026-40528

LOW 3.8

OpenSC < 0.27.0 Buffer Overrun in do_key_value() via profile.c

CVSS Score

3.8

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-121 CWE-122
Vendor	opensc
Product	opensc
Published	May 29, 2026
Last Updated	May 29, 2026

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CVSS v3 Breakdown

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

Attack Vector

Physical

Attack Complexity

High

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

Low

Integrity

Low

Availability

Low

Affected Versions

OpenSC / OpenSC

0 < 0.27.0 0 < 0358817ec74aeca654f83e7709c7720b14c5db59

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Nicholas Carlini of Anthropic