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    CVE-2026-40528

    OpenSC before 0.27.0, fixed in commit 0358817, contains a stack and heap buffer overrun vulnerability in the do_key_value() function in src/pkcs15init/profile.c that allows attackers to corrupt memory by supplying a crafted profile configuration file. During pkcs15-init invocation, a key value entry beginning with '=' followed by more than sizeof(keybuf) characters is copied into keybuf via memcpy without a length check, causing both stack and heap buffer overruns.

    Published:May 29, 2026
    Last Modified:Jun 3, 2026
    EPS:May 29, 2026
    EPSS Score:0.00005
    CVSS Score:3.8

    Affected Products

    Vendor
    Opensc
    Product
    Opensc
    Vendor
    Opensc Project
    Product
    Opensc

    Exploits

    No exploit reference

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-92 Forced Integer Overflow

    Related CVEs

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    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-2025-66037 (CVSS 3.9) — OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, feeding a crafted input to …
    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