OpenSC card-setcos.c setcos_construct_fci_44 stack-based overflow (CVE-2026-103531) | HOL Guard CVE

Medium · CVSS 5.1CVE-2026-103531

OpenSC card-setcos.c setcos_construct_fci_44 stack-based overflow

Answer in brief

CVE-2026-103531 records a Medium severity (CVSS 5.1) vulnerability in OpenSC card-setcos.c setcos_construct_fci_44 stack-based overflow. The current sources do not mark it as known exploited. The current feed maps n/a/OpenSC (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 1, 2026Updated Oct 1, 2026Source checked Oct 1, 2026First seen by HOL Oct 1, 2026Material review Oct 1, 2026

Upstream Advisory

Key facts

Risk: Medium · CVSS 5.1
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 5.1. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps n/a/OpenSC (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
n/a/OpenSCgeneric	0.27.0 \|\| 0.27.1	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for n/a/OpenSC.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Oct 1, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Oct 1, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.