Vulnerability · Published May 29, 2026 · Assigned by VulnCheck

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

Low 3.8

In plain English

A low-severity stack buffer overflow in OpenSC from OpenSC. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 22% of all known vulnerabilities).

Severity (CVSS 3.1)3.8Low

Exploit odds (30 days)0.3%top 77.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
OpenSC	OpenSC	0 – before 0.27.0-rc10 – before 3f24f0b48a481a8cf2e46059d8238a283ddc1c13

Weakness: CWE-121 · Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

References

https://github.com/OpenSC/OpenSC/pull/3558 issue-tracking
https://github.com/OpenSC/OpenSC/commit/3f24f0b48a481a8cf2e46059d8238a283ddc1c13 patch
https://www.vulncheck.com/advisories/opensc-stack-buffer-overflow-via-piv-process-history-in-card-piv-c third-party-advisory