# CVE-2023-4535: Opensc: out-of-bounds read in myeid driver handling encryption using symmetric keys Status: published. Published: 2023-11-06. Updated: 2026-11-07. An out-of-bounds read vulnerability was found in OpenSC packages within the MyEID driver when handling symmetric key encryption. Exploiting this flaw requires an attacker to have physical access to the computer and a specially crafted USB device or smart card. This flaw allows the attacker to manipulate APDU responses and potentially gain unauthorized access to sensitive data, compromising the system's security. ## Remediation - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: secalert@redhat.com) — https://github.com/OpenSC/OpenSC/commit/f1993dc4e0b33050b8f72a3558ee88b24c4063b2 - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: secalert@redhat.com) — https://github.com/OpenSC/OpenSC/issues/2792#issuecomment-1674806651 - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: af854a3a-2127-422b-91ae-364da2661108) — https://github.com/OpenSC/OpenSC/commit/f1993dc4e0b33050b8f72a3558ee88b24c4063b2 - fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: af854a3a-2127-422b-91ae-364da2661108) — https://github.com/OpenSC/OpenSC/issues/2792#issuecomment-1674806651 ## Affected products and versions - Red Hat / Red Hat Enterprise Linux 9 (opensc): ≥ 0:0.23.0-3.el9_3; < * (unaffected, rpm). Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 7 (opensc): Version range not reported. Source: CNA: redhat - Red Hat / Red Hat Enterprise Linux 8 (opensc): Version range not reported. Source: CNA: redhat ## NVD configuration conditions Affected CPE matches depend on the following AND/OR and negation conditions: ```json [ { "negate": false, "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:a:opensc_project:opensc:0.23.0:-:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:a:opensc_project:opensc:0.23.0:rc1:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:a:opensc_project:opensc:0.23.0:rc2:*:*:*:*:*:*", "vulnerable": true } ], "negate": false, "operator": "OR" } ], "operator": "OR" }, { "negate": false, "nodes": [ { "cpeMatch": [ { "criteria": "cpe:2.3:o:fedoraproject:fedora:38:*:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:fedoraproject:fedora:39:*:*:*:*:*:*:*", "vulnerable": true }, { "criteria": "cpe:2.3:o:redhat:enterprise_linux:9.0:*:*:*:*:*:*:*", "vulnerable": true } ], "negate": false, "operator": "OR" } ], "operator": "OR" } ] ``` ## Severity and prioritization - CVSS 3.1: 4.5 (medium); CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L; source: CNA: redhat - CVSS 3.1: 3.8 (low); CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L; source: NVD: nvd@nist.gov - CVSS 3.1: 4.5 (medium); CVSS:3.1/AV:P/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:L; source: NVD: secalert@redhat.com - CISA KEV: No listing in collected sources - EPSS: 0.52% as of 2026-11-06; percentile 44.55% - SSVC: Not available - Weaknesses: CWE-125 ## Exploit evidence No exploit evidence in collected sources. This is not proof of no exploitation. ## References - https://access.redhat.com/errata/RHSA-2023:7879 (CNA: redhat; vendor-advisory, x_refsource_REDHAT) - https://access.redhat.com/security/cve/CVE-2023-4535 (CNA: redhat; vdb-entry, x_refsource_REDHAT) - https://bugzilla.redhat.com/show_bug.cgi?id=2240914 (CNA: redhat; issue-tracking, x_refsource_REDHAT) - https://github.com/OpenSC/OpenSC/commit/f1993dc4e0b33050b8f72a3558ee88b24c4063b2 (CNA: redhat) - https://github.com/OpenSC/OpenSC/issues/2792#issuecomment-1674806651 (CNA: redhat) - https://github.com/OpenSC/OpenSC/releases/tag/0.24.0-rc1 (CNA: redhat) - https://github.com/OpenSC/OpenSC/wiki/OpenSC-security-advisories (CNA: redhat) - https://access.redhat.com/errata/RHSA-2023:7879 (ADP: CVE; vendor-advisory, x_refsource_REDHAT, x_transferred) - https://access.redhat.com/security/cve/CVE-2023-4535 (ADP: CVE; vdb-entry, x_refsource_REDHAT, x_transferred) - https://bugzilla.redhat.com/show_bug.cgi?id=2240914 (ADP: CVE; issue-tracking, x_refsource_REDHAT, x_transferred) - https://github.com/OpenSC/OpenSC/commit/f1993dc4e0b33050b8f72a3558ee88b24c4063b2 (ADP: CVE; x_transferred) - https://github.com/OpenSC/OpenSC/issues/2792#issuecomment-1674806651 (ADP: CVE; x_transferred) - https://github.com/OpenSC/OpenSC/releases/tag/0.24.0-rc1 (ADP: CVE; x_transferred) - https://github.com/OpenSC/OpenSC/wiki/OpenSC-security-advisories (ADP: CVE; x_transferred) - https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3CPQOMCDWFRBMEFR5VK4N5MMXXU42ODE/ (ADP: CVE; x_transferred) - https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GLYEFIBBA37TK3UNMZN5NOJ7IWCIXLQP/ (ADP: CVE; x_transferred) - https://access.redhat.com/errata/RHSA-2023:7879 (secalert@redhat.com; Third Party Advisory) - https://access.redhat.com/security/cve/CVE-2023-4535 (secalert@redhat.com; Third Party Advisory) - https://bugzilla.redhat.com/show_bug.cgi?id=2240914 (secalert@redhat.com; Issue Tracking) - https://github.com/OpenSC/OpenSC/commit/f1993dc4e0b33050b8f72a3558ee88b24c4063b2 (secalert@redhat.com; Patch) - https://github.com/OpenSC/OpenSC/issues/2792#issuecomment-1674806651 (secalert@redhat.com; Issue Tracking, Patch) - https://github.com/OpenSC/OpenSC/releases/tag/0.24.0-rc1 (secalert@redhat.com; Release Notes) - https://github.com/OpenSC/OpenSC/wiki/OpenSC-security-advisories (secalert@redhat.com; Vendor Advisory) - https://access.redhat.com/errata/RHSA-2023:7879 (af854a3a-2127-422b-91ae-364da2661108; Third Party Advisory) - https://access.redhat.com/security/cve/CVE-2023-4535 (af854a3a-2127-422b-91ae-364da2661108; Third Party Advisory) - https://bugzilla.redhat.com/show_bug.cgi?id=2240914 (af854a3a-2127-422b-91ae-364da2661108; Issue Tracking) - https://github.com/OpenSC/OpenSC/commit/f1993dc4e0b33050b8f72a3558ee88b24c4063b2 (af854a3a-2127-422b-91ae-364da2661108; Patch) - https://github.com/OpenSC/OpenSC/issues/2792#issuecomment-1674806651 (af854a3a-2127-422b-91ae-364da2661108; Issue Tracking, Patch) - https://github.com/OpenSC/OpenSC/releases/tag/0.24.0-rc1 (af854a3a-2127-422b-91ae-364da2661108; Release Notes) - https://github.com/OpenSC/OpenSC/wiki/OpenSC-security-advisories (af854a3a-2127-422b-91ae-364da2661108; Vendor Advisory) - https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/3CPQOMCDWFRBMEFR5VK4N5MMXXU42ODE/ (af854a3a-2127-422b-91ae-364da2661108) - https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GLYEFIBBA37TK3UNMZN5NOJ7IWCIXLQP/ (af854a3a-2127-422b-91ae-364da2661108) ## Provenance - CNA: redhat: https://www.cve.org/CVERecord?id=CVE-2023-4535; retrieved 2026-11-07; source updated 2026-11-07 - NVD: https://nvd.nist.gov/vuln/detail/CVE-2023-4535; retrieved 2026-11-07; source updated 2026-11-07 - FIRST EPSS: https://api.first.org/data/v1/epss?cve=CVE-2023-4535; retrieved 2026-11-07; source updated Not reported Revision: d585656fcbb3682e9a0499825c9edb90b0c31a882ef90cf8325a62e7378e9627 Canonical: https://y2.dev/cve/CVE-2023-4535 ## Agent and API access Public CVE pages, Markdown, and JSON are free to read without an account or API key. - Public catalog: https://y2.dev/cve/index.json. 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