CVE-2026-103531

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.19% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 9.0% of scored records. A rank, not a probability.

NVD base score

5.1 (CVSS v4.0), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

NVD analysis status

Deferred. NVD last modified this record on 2026-10-06.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2026-10-01 00:45Z28 DAYS AGO

Last updated

2026-10-05 23:57Z23 DAYS AGO

Reserved

2026-09-30

Assigning CNA

VulDB

Record state

PUBLISHED

Severity

Medium (CVSS 5.1)

CNA CVSS vector

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:X

Weaknesses

• CWE-119Improper Restriction of Operations within the Bounds of a Memory BufferClass
• CWE-121Stack-based Buffer OverflowVariant
• CWE-787Out-of-bounds WriteBase

Data version

5.2

Document digest

a6ef5f784c43d0627629e91a8c5cbfc3461bdbb1d7e644e99a2c877939b2ed2d

• vuldb.comVDB-412343 | OpenSC card-setcos.c setcos_construct_fci_44 stack-based overflowhttps://vuldb.com/vuln/412343vdb-entrytechnical-description
• vuldb.comVDB-412343 | CTI Indicators (IOB, IOC, IOA)https://vuldb.com/vuln/412343/ctisignaturepermissions-required
• vuldb.comCVE-2026-103531 | CVE Analysis and Reporthttps://vuldb.com/cve/CVE-2026-103531third-party-advisory
• vuldb.comSubmit #956910 | OpenSC >= 0.12.2 up to and including 0.27.1 (latest release, unfixed; fix approved in PR #3812, pending merge) Buffer Overflow (stack, CWE-121)https://vuldb.com/submit/956910third-party-advisory
• github.comhttps://github.com/OpenSC/OpenSC/pull/3812issue-trackingpatch
• github.comhttps://github.com/OpenSC/OpenSC/commit/ad730304052937c32b4eb489a06835ac6123632cpatch
• github.comhttps://github.com/OpenSC/OpenSC/product