CVE-2026-40510: OpenSC < 0.27.0-rc1 Stack Buffer Overflow via piv_process_history() in card-piv.c

Published May 29, 2026
·
Updated

OpenSC before 0.27.0-rc1, fixed in commit 3f24f0b, contains a stack buffer overflow vulnerability in pivprocesshistory() 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.

Affected Software

3 affected components
OpenSC OpenSC<0.27.0-rc1
Opensc Project Opensc<0.27.0
Microsoft azl3 opensc 0.27.1-1

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade opensc to a version that resolves this vulnerability.

    Fixed in 0.27.0-rc1Patch 3f24f0b
  2. Compensating control

    Mitigate physically present exploitation by preventing/controlling access to the system’s smart-card/USB interfaces used for PIV cards (limit who can present a crafted PIV smart card/USB device).

Event History

May 29, 2026
CVE Published
via MITRE·01:26 PM
Data Sourced
via MITRE·01:26 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·02:16 PM
RemedyDescriptionSeverityWeaknessAffected Software
May 31, 2026
Data Sourced
via Microsoft·08:01 AM
DescriptionSeverityWeaknessAffected Software
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Frequently Asked Questions

1

What is the severity of CVE-2026-40510?

The severity of CVE-2026-40510 is rated as low with a score of 3.8.

2

How do I fix CVE-2026-40510?

To fix CVE-2026-40510, update OpenSC to version 0.27.0-rc1 or later.

3

What is the impact of CVE-2026-40510?

CVE-2026-40510 allows physical attackers to trigger memory corruption by using a crafted PIV smart card or USB device.

4

What type of vulnerability is CVE-2026-40510?

CVE-2026-40510 is classified as a stack buffer overflow vulnerability.

5

How can a physical attacker exploit CVE-2026-40510?

A physical attacker can exploit CVE-2026-40510 by presenting a specially crafted PIV smart card that triggers the buffer overflow.

Company

Resources

Contact

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CVE-2026-40510 - OpenSC < 0.27.0-rc1 Stack Buffer Overflow via piv_process_history() in card-piv.c - SecAlerts