Cyber Resilience

CVE-2026-40528

LowPublic PoC

Published: 29 May 2026

Published
29 May 2026
Modified
03 June 2026
KEV Added
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Patch
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CVSS Score v4 1.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
EPSS Score 0.0014 3.8th percentile
Risk Priority 2 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-40528 is a low-severity Stack-based Buffer Overflow (CWE-121) vulnerability in Opensc Project Opensc. Its CVSS base score is 1.0 (Low).

Operationally, ranked at the 3.8th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

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…

more

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(s)
CWE-121CWE-122

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

Insufficient information to map techniques.
Confidence: LOW · MITRE ATT&CK Enterprise v18.1

Affected Assets

opensc project
opensc
≤ 0.27.0

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References