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TI-2026-29275 Aliases CVE-2026-40528GHSA-vxjj-52h8-95w5

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

Priority LOW 6CWE-121Published · Updated

Key facts

Attack vector
Physical
Privileges required
None
User interaction
Passive
Attack complexity
High
Attack requirements
None
Impact type
—
Confidentiality · integrity · availability
Low · Low · Low
Fix status
Partial Red Hat: 4 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00188 8th percentileScored 2026-11-07
Fix Partial OpenSC (OpenSC): 0.27.0Red Hat: 4 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
OpenSCOpenSCbefore 0.27.00.27.0Patch availableCNA
  • OpenSC VendorOpenSC Affected before 0.27.0 Fixed in 0.27.0 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:opensc_project:opensc:*:*:*:*:*:*:*:*before 0.27.0VulnerableOpenSC
  • cpe:2.3:a:opensc_project:opensc:*:*:*:*:*:*:*:* Versions before 0.27.0 Vulnerable ·OpenSC

Remediation

  • Fix · CNA OpenSC (OpenSC) Fixed in 0.27.0

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Red Hat Enterprise Linux 10AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 7AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 8AffectedNo fix yet: Fix deferred
Red Hat Enterprise Linux 9AffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40528
  2. 2026-10-03 Alias added: GHSA-vxjj-52h8-95w5

References

Patch 1

  • TI-2025-40564 OpenSC: `sc_compacttlv_find_tag` can return out-of-bounds pointers CVSS 3.1MEDIUM 6.8
  • TI-2025-40563 OpenSC: Out of Bounds vulnerability CVSS 3.1MEDIUM 6.8
  • TI-2019-04558 sc_context_create in ctx.c in libopensc in OpenSC 0.19.0 has a memory leak, as demonstrated by a call from eidenv. CVSS 3.0HIGH 7.5
  • TI-2021-13306 Stack overflow vulnerability in OpenSC smart card middleware before 0.23 via crafted responses to APDUs. CVSS 3.1HIGH 7.5
  • TI-2019-12067 An issue was discovered in the pam_p11 component 0.2.0 and 0.3.0 for OpenSC. CVSS 3.0HIGH 7.5
  • TI-2023-21453 Opensc: potential pin bypass when card tracks its own login state CVSS 3.1MEDIUM 6.6
See all 49 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences