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Fencer Vulns
low 3.8

CVE-2026-40510 json

OpenSC < 0.27.0-rc1 Stack Buffer Overflow via piv_process_history() in card-piv.c

published 2026-05-29 5 mo ago modified 2026-11-08 22 h ago also EUVD-2026-33315

cvss
3.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 22%
public exploits
0
none known

Summary

OpenSC before 0.27.0-rc1, fixed in commit 3f24f0b, contains a stack buffer overflow vulnerability in piv_process_history() in src/libopensc/card-piv.c that allows physically present attackers to trigger memory corruption by presenting a crafted PIV smart card or USB device returning a URL field longer than 118 bytes in the Key History Object ASN.1 response.

Patch / fix

  • OpenSC OpenSC 0.27.0-rc1
  • opensc SLE Module for Basesystem 15 SP7 0.22.0-150600.11.14.1
  • opensc SLE Micro 5.5, SLE Micro 5.4, SLE Micro 5.3 0.22.0-150400.3.20.1
  • opensc SLES 16.0, Linux Micro 6.2, SLES for SAP applications 16.0 0.26.1-160000.4.1
  • opensc Linux Micro 6.0 0.24.0-7.1
  • opensc Linux Micro 6.1 0.24.0-slfo.1.1_5.1
  • opensc SLES LTSS Extended Security 12 SP5 0.13.0-3.39.1

suse advisories SUSE-SU-2026:4123-1SUSE-SU-2026:4122-1SUSE-SU-2026:23543-1SUSE-SU-2026:23697-1SUSE-SU-2026:23717-1SUSE-SU-2026:4108-1

  • opensc openSUSE Leap 16.0 0.26.1-160000.4.1

opensuse advisories openSUSE-SU-2026:21820-1

  • opensc Azure Linux 3.0 0.27.0-rc1

azure linux advisories AZL-89150

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-40510 updated cvss 6.3

opensc: OpenSC: Memory corruption via crafted PIV smart card

  • Red Hat Enterprise Linux 7 opensc Red Hat Enterprise Linux 8 opensc Red Hat Enterprise Linux 9 opensc Red Hat Enterprise Linux 10 opensc
    affected: no fix available “Fix deferred”

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.29% chance of exploitation in the next 30 days, higher than 22% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 4.0 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
CNA 3.1 3.8 CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L
CNA 4.0 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
NVD 3.1 6.8 CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • OpenSC OpenSC

Classification

Weakness
  • CWE-121 Stack-based Buffer Overflow

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.