CVE-2025-66037

OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, feeding a crafted input to the fuzz_pkcs15_reader harness causes OpenSC to perform an out-of-bounds heap read in the X.509/SPKI handling path. Specifically, sc_pkcs15_pubkey_from_spki_fields() allocates a zero-length buffer and then reads one byte past the end of that allocation. This issue has been patched in version 0.27.0.

• CWE-125

• https://github.com/OpenSC/OpenSC/security/advisories/GHSA-m58q-rmjm-mmfxExploit, Vendor Advisory
• https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66037Vendor Advisory

Published

Mar 30, 2026

Last Modified

Jun 17, 2026

Status

Analyzed

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