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    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.

    Published:Mar 30, 2026
    Last Modified:Apr 3, 2026
    EPS:Mar 30, 2026
    EPSS Score:0.00005
    CVSS Score:3.9

    Affected Products

    Vendor
    Opensc
    Product
    Opensc
    Vendor
    Opensc Project
    Product
    Opensc

    Exploits

    https://github.com/OpenSC/OpenSC/security/advisories/GHSA-m58q-rmjm-mmfx

    Common Weakness Enumeration

    CWE-125 Out-of-bounds Read

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers

    Related CVEs

    CVE-2026-10275 (CVSS 1.3) — A flaw has been found in OpenSC up to 0.26.1. This affects the function test_kpgen_certwrite of the file src/t…
    CVE-2026-40528 (CVSS 1) — OpenSC before 0.27.0, fixed in commit 0358817, contains a stack and heap buffer overrun vulnerability in the d…
    CVE-2026-40510 (CVSS 1) — OpenSC before 0.27.0-rc1, fixed in commit 3f24f0b, contains a stack buffer overflow vulnerability in piv_proce…
    CVE-2025-13763 (CVSS 5.7) — Multiple uses of uninitialized variables were found in libopensc that may lead to information disclosure or ap…
    CVE-2025-66215 (CVSS 3.8) — OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, an attacker with physical a…
    CVE-2025-66038 (CVSS 3.9) — OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, sc_compacttlv_find_tag sear…
    CVE-2025-49010 (CVSS 3.8) — OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, an attacker with physical a…

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High