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CVE-2026-40528

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

1.0 LowFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Physical
Complexity
High
Privileges needed
None
User interaction
Passive

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
Low

Exploit likelihood

0.19%Up 0.2 points since May 30, 2026
90%50%10%1%

What each source reports

CVE List Score used 1.0

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.

Record
CVE-2026-40528
CVSS 4.0
1.0 LowCVSS:4.0/AV:P/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
CVSS 3.1
3.8 LowCVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Weakness
CWE-121, CWE-122
Updated
2026-11-02
EUVDEUVD-2026-33320 1.0

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.

Record
EUVD-2026-33320
CVSS 4.0
1.0 LowCVSS:4.0/AV:P/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-vxjj-52h8-95w5 1.0

OpenSC before 0.27.0, fixed in commit 0358817, contains a stack and heap buffer overrun...

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.

Record
GHSA-vxjj-52h8-95w5
CVSS 4.0
1.0 LowCVSS: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
CVSS 3.1
3.8 LowCVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
Weakness
CWE-121
Updated
2026-11-02
NVD 1.0

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.

Record
CVE-2026-40528
CVSS 4.0
1.0 LowCVSS: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
CVSS 3.1
3.8 LowCVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
CVSS 3.1
7.8 HighCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Weakness
CWE-121, CWE-122
Updated
2026-11-02
OSV 1.0

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.

Record
CVE-2026-40528
CVSS 4.0
1.0 LowCVSS:4.0/AV:P/AC:H/AT:N/PR:N/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N
Weakness
CWE-121, CWE-122
Updated
2026-11-02
OSVAZL-89147 No score

CVE-2026-40528 affecting package opensc for versions less than 0.27.0-1

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.

Record
AZL-89147
Updated
2026-11-02
Show 9 moreShow less
OSVCLSA-2026-1780711381 No score

opensc: Fix of 2 CVEs

  • CVE-2026-40510: stack buffer overflow in piv_process_history() via crafted PIV Key History Object
  • CVE-2026-40528: stack/heap buffer overrun in do_key_value() via overlong pkcs15init profile key value
Record
CLSA-2026-1780711381
Updated
2026-11-02
OSVCLSA-2026-1781088266 No score

opensc: Fix of CVE-2026-40528

  • CVE-2026-40528: avoid possible buffer overrun when parsing pkcs15-init profile key values
Record
CLSA-2026-1781088266
Updated
2026-11-02
OSVMGASA-2026-0231 No score

Updated opensc packages fix security vulnerabilities

These packages fix security vulnerabilities: CVE-2026-10275, A flaw has been found in OpenSC up to 0.26.1. This affects the function test_kpgen_certwrite of the file src/tools/pkcs11-tool.c of the component pkcs11-tool Key Generation Module. This manipulation causes buffer overflow. The attack is possible to be carried out remotely. The complexity of an attack is rather high. It is indicated that the exploitability is difficult. The exploit has been published and may be used. Patch name: 814f745b3b6d100295f65f1935edd33d520d33ab. It is recommended to apply a patch to fix this issue. CVE-2026-40528, 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.

Record
MGASA-2026-0231
Updated
2026-11-02
OSVopenSUSE-SU-2026:11022-1 No score

opensc-0.27.1-2.1 on GA media

These are all security issues fixed in the opensc-0.27.1-2.1 package on the GA media of openSUSE Tumbleweed.

Record
openSUSE-SU-2026:11022-1
Updated
2026-11-02
OSVopenSUSE-SU-2026:21873-1 No score

Security update for opensc

This update for opensc fixes the following issues:

  • CVE-2026-10275: global buffer overflow during key pair generation tests due to missing input validation (bsc#1267246).
  • CVE-2026-40528: stack and heap buffer overrun in the do_key_value() function due to missing length check allows for memory corruption via a crafted profile configuration file (bsc#1266963).
Record
openSUSE-SU-2026:21873-1
Updated
2026-11-02
OSVSUSE-SU-2026:22103-1 No score

Security update for opensc

This update for opensc fixes the following issues

  • CVE-2026-10275: global buffer overflow during key pair generation tests due to missing input validation (bsc#1267246).
  • CVE-2026-40528: stack and heap buffer overrun in the do_key_value() function due to missing length check allows for memory corruption via a crafted profile configuration file (bsc#1266963).
Record
SUSE-SU-2026:22103-1
Updated
2026-11-02
OSVSUSE-SU-2026:22139-1 No score

Security update for opensc

This update for opensc fixes the following issues

  • CVE-2026-10275: global buffer overflow during key pair generation tests due to missing input validation (bsc#1267246).
  • CVE-2026-40528: stack and heap buffer overrun in the do_key_value() function due to missing length check allows for memory corruption via a crafted profile configuration file (bsc#1266963).
Record
SUSE-SU-2026:22139-1
Updated
2026-11-02
OSVSUSE-SU-2026:2657-1 No score

Security update for opensc

This update for opensc fixes the following issues

  • CVE-2025-49010: stack-buffer-overflow via crafted smart card or USB device responses (bsc#1261214).
  • CVE-2025-66037: crafted input can cause an out-of-bounds read (bsc#1261218).
  • CVE-2025-66038: improper compact-TLV length validation can lead to crash or unexpected behavior (bsc#1261219).
  • CVE-2025-66215: crafted smart card or USB device can cause a stack-buffer-overflow write (bsc#1261220).
  • CVE-2026-10275: global buffer overflow during key pair generation tests due to missing input validation (bsc#1267246).
  • CVE-2026-40528: stack and heap buffer overrun in the do_key_value() function due to missing length check allows for memory corruption via a crafted profile configuration file (bsc#1266963).
Record
SUSE-SU-2026:2657-1
Updated
2026-11-02
OSVSUSE-SU-2026:2697-1 No score

Security update for opensc

This update for opensc fixes the following issues

  • CVE-2025-49010: stack-buffer-overflow via crafted smart card or USB device responses (bsc#1261214).
  • CVE-2025-66037: crafted input can cause an out-of-bounds read (bsc#1261218).
  • CVE-2025-66038: improper compact-TLV length validation can lead to crash or unexpected behavior (bsc#1261219).
  • CVE-2025-66215: crafted smart card or USB device can cause a stack-buffer-overflow write (bsc#1261220).
  • CVE-2026-10275: global buffer overflow during key pair generation tests due to missing input validation (bsc#1267246).
  • CVE-2026-40528: stack and heap buffer overrun in the do_key_value() function due to missing length check allows for memory corruption via a crafted profile configuration file (bsc#1266963).
Record
SUSE-SU-2026:2697-1
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
opensc
Azure Linux:3
 before 0.27.0-1
0.27.0-1
opensc
TuxCare:AlmaLinux:9.2
From an advisory covering 2 CVEs
 before 0.22.0-2.el9_2.tuxcare.els8
0.22.0-2.el9_2.tuxcare.els8
opensc
TuxCare:AlmaLinux:9.6
 before 0.23.0-5.el9.tuxcare.els4
0.23.0-5.el9.tuxcare.els4
opensc
Mageia:9
From an advisory covering 2 CVEs
 before 0.25.0-1.3.mga9
0.25.0-1.3.mga9
opensc
SUSE:Linux Micro 6.0
From an advisory covering 2 CVEs
 before 0.24.0-6.1
0.24.0-6.1
opensc
SUSE:Linux Micro 6.1
From an advisory covering 2 CVEs
 before 0.24.0-slfo.1.1_4.1
0.24.0-slfo.1.1_4.1
opensc
SUSE:Linux Enterprise Micro 5.3
From an advisory covering 6 CVEs
 before 0.22.0-150400.3.17.1
0.22.0-150400.3.17.1
opensc
SUSE:Linux Enterprise Micro 5.4
From an advisory covering 6 CVEs
 before 0.22.0-150400.3.17.1
0.22.0-150400.3.17.1
opensc
SUSE:Linux Enterprise Micro 5.5
From an advisory covering 6 CVEs
 before 0.22.0-150400.3.17.1
0.22.0-150400.3.17.1
opensc
SUSE:Linux Enterprise High Performance Computing 15 SP4-ESPOS
From an advisory covering 6 CVEs
 before 0.22.0-150400.3.17.1
0.22.0-150400.3.17.1
Show 12 moreShow less
Affected packages
PackageAffectedFixed
opensc
SUSE:Linux Enterprise High Performance Computing 15 SP4-LTSS
From an advisory covering 6 CVEs
 before 0.22.0-150400.3.17.1
0.22.0-150400.3.17.1
opensc
SUSE:Linux Enterprise High Performance Computing 15 SP5-ESPOS
From an advisory covering 6 CVEs
 before 0.22.0-150400.3.17.1
0.22.0-150400.3.17.1
opensc
SUSE:Linux Enterprise High Performance Computing 15 SP5-LTSS
From an advisory covering 6 CVEs
 before 0.22.0-150400.3.17.1
0.22.0-150400.3.17.1
opensc
SUSE:Linux Enterprise Server 15 SP4-LTSS
From an advisory covering 6 CVEs
 before 0.22.0-150400.3.17.1
0.22.0-150400.3.17.1
opensc
SUSE:Linux Enterprise Server 15 SP5-LTSS
From an advisory covering 6 CVEs
 before 0.22.0-150400.3.17.1
0.22.0-150400.3.17.1
opensc
SUSE:Linux Enterprise Server for SAP Applications 15 SP4
From an advisory covering 6 CVEs
 before 0.22.0-150400.3.17.1
0.22.0-150400.3.17.1
opensc
SUSE:Linux Enterprise Server for SAP Applications 15 SP5
From an advisory covering 6 CVEs
 before 0.22.0-150400.3.17.1
0.22.0-150400.3.17.1
opensc
SUSE:Linux Enterprise Module for Basesystem 15 SP7
From an advisory covering 6 CVEs
 before 0.22.0-150600.11.11.1
0.22.0-150600.11.11.1
opensc
SUSE:Linux Enterprise Server 15 SP6-LTSS
From an advisory covering 6 CVEs
 before 0.22.0-150600.11.11.1
0.22.0-150600.11.11.1
opensc
SUSE:Linux Enterprise Server for SAP Applications 15 SP6
From an advisory covering 6 CVEs
 before 0.22.0-150600.11.11.1
0.22.0-150600.11.11.1
opensc
openSUSE:Tumbleweed
From an advisory covering 2 CVEs
 before 0.27.1-2.1
0.27.1-2.1
opensc
openSUSE:Leap 16.0
From an advisory covering 2 CVEs
 before 0.26.1-160000.5.1
0.26.1-160000.5.1

History

History
RecordedChangedSources
affected, facts
first indexedCVE List, EUVD, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2026-40528 is a low vulnerability (CVSS 1.0) in Opensc, published May 29, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.19%, the 8th percentile. Fixed in opensc 0.27.0-1.

References

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