What is CVE-2025-66038?

CVE-2025-66038 is a low-severity vulnerability in Opensc, classified under Buffer Over-read. CVSS score: 3.9/10. Published 2026-03-30.

How severe is CVE-2025-66038?

Low severity. CVSS v3 base score is 3.9 out of 10.

Vulnerability in Opensc

CVE-2025-66038

OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, sc_compacttlv_find_tag searches a compact-TLV buffer for a given tag. In compact-TLV, a single byte encodes the tag (high nibble) and value length (low nibb…

EPSS: 0.000 (9.3th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.9 (Low). Vector: CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L.

Affected products

Opensc — versions < 0.27.0

Weakness classification (CWE)

CWE-126 — Buffer Over-read

References

https://github.com/OpenSC/OpenSC/security/advisories/GHSA-72x5-fwjx-2459 (x_refsource_CONFIRM)
https://github.com/OpenSC/OpenSC/commit/6db171bcb6fd7cb3b51098fefbb3b28e44f0a79c (x_refsource_MISC)
https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66038 (x_refsource_MISC)

Frequently asked questions

What is CVE-2025-66038?: CVE-2025-66038 is a low-severity vulnerability in Opensc, classified under Buffer Over-read. CVSS score: 3.9/10. Published 2026-03-30.
How severe is CVE-2025-66038?: Low severity. CVSS v3 base score is 3.9 out of 10.