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CVE-2026-40528

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

Published: May 29, 2026Updated: May 29, 2026 Sources: CVE List NVD
NVD MITRE
3.8CVSS
LOW

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.

EPSS Score
N/A
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
No Fix Available

CVSS Vector Breakdown

AV:PAC:HPR:NUI:RS:UC:LI:LA:L
Exploitability
AV:PAttack Vector
Physical
AC:HAttack Complexity
High
PR:NPrivileges Required
None
UI:RUser Interaction
Required
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low

Weaknesses

CWE-121CWE-122

Affected Products

OpenSC
OpenSC

Attack Graph

Products CVE Techniques Tactics

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Exploitability

No known exploits, KEV entries, or remediation guidance available for this vulnerability yet.

MITRE ATT&CK

1 technique
Privilege Escalation
View detailed technique mapping

References

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

Timeline

Published
May 29, 2026
Last Updated
May 29, 2026

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