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Vulnerability Details :

CVE-2026-40528

Summary
Assigner-VulnCheck
Assigner Org ID-83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At-29 May, 2026 | 13:38
Updated At-29 May, 2026 | 13:58
Rejected At-
Credits

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

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.

Vendors
-
Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:VulnCheck
Assigner Org ID:83251b91-4cc7-4094-a5c7-464a1b83ea10
Published At:29 May, 2026 | 13:38
Updated At:29 May, 2026 | 13:58
Rejected At:
▼CVE Numbering Authority (CNA)
OpenSC < 0.27.0 Buffer Overrun in do_key_value() via profile.c

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.

Affected Products
Vendor
OpenSC
Product
OpenSC
Repo
https://github.com/OpenSC/OpenSC
Default Status
affected
Versions
Affected
  • From 0 before 0.27.0 (semver)
  • From 0 before 0358817ec74aeca654f83e7709c7720b14c5db59 (git)
Problem Types
TypeCWE IDDescription
CWECWE-121Stack-based Buffer Overflow
CWECWE-122Heap-based Buffer Overflow
Type: CWE
CWE ID: CWE-121
Description: Stack-based Buffer Overflow
Type: CWE
CWE ID: CWE-122
Description: Heap-based Buffer Overflow
Metrics
VersionBase scoreBase severityVector
4.01.0LOW
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
3.13.8LOW
CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Version: 4.0
Base score: 1.0
Base severity: LOW
Vector:
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
Version: 3.1
Base score: 3.8
Base severity: LOW
Vector:
CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
finder
Nicholas Carlini of Anthropic
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
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
Hyperlink: https://github.com/OpenSC/OpenSC/commit/0358817ec74aeca654f83e7709c7720b14c5db59
Resource:
patch
Hyperlink: https://www.vulncheck.com/advisories/opensc-buffer-overrun-in-do-key-value-via-profile-c
Resource:
third-party-advisory
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
Source:disclosure@vulncheck.com
Published At:29 May, 2026 | 14:16
Updated At:29 May, 2026 | 14:16

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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.01.0LOW
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
Primary3.13.8LOW
CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Type: Secondary
Version: 4.0
Base score: 1.0
Base severity: LOW
Vector:
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
Type: Primary
Version: 3.1
Base score: 3.8
Base severity: LOW
Vector:
CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-121Primarydisclosure@vulncheck.com
CWE-122Primarydisclosure@vulncheck.com
CWE ID: CWE-121
Type: Primary
Source: disclosure@vulncheck.com
CWE ID: CWE-122
Type: Primary
Source: disclosure@vulncheck.com
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://github.com/OpenSC/OpenSC/commit/0358817ec74aeca654f83e7709c7720b14c5db59disclosure@vulncheck.com
N/A
https://www.vulncheck.com/advisories/opensc-buffer-overrun-in-do-key-value-via-profile-cdisclosure@vulncheck.com
N/A
Hyperlink: https://github.com/OpenSC/OpenSC/commit/0358817ec74aeca654f83e7709c7720b14c5db59
Source: disclosure@vulncheck.com
Resource: N/A
Hyperlink: https://www.vulncheck.com/advisories/opensc-buffer-overrun-in-do-key-value-via-profile-c
Source: disclosure@vulncheck.com
Resource: N/A

Change History

0
Information is not available yet

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