Vulnerability in OpenSC

[ Description ]Official description

A flaw has been found in OpenSC up to 0.27.1. The impacted element is the function setcos_construct_fci_44 of the file src/libopensc/card-setcos.c. Executing a manipulation of the argument type_attr can lead to stack-based buffer overflow. The attack can be launched remotely. This patch is called ad730304052937c32b4eb489a06835ac6123632c. It is best practice to apply a patch to resolve this issue.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• BSI CERT-Bund30 Sep 2026WID-SEC-2026-3682

  OpenSC: Vulnerability allows code execution Translated from German

  CVE-2026-103531

[ References ]References

• github.com/OpenSC/OpenSC
• github.com/OpenSC/OpenSC/commit/ad730304052937c32b4eb489a06835ac6123632c
• github.com/OpenSC/OpenSC/pull/3812
• vuldb.com/cve/CVE-2026-103531
• vuldb.com/submit/956910
• vuldb.com/vuln/412343
• vuldb.com/vuln/412343/cti