{"id":"CVE-2026-40253","summary":"openCryptoki: Memory safety vulnerabilities in BER/DER decoders in asn1.c","details":"openCryptoki is a PKCS#11 library and provides tooling for Linux and AIX. In versions 3.26.0 and below, the BER/DER decoding functions in the shared common library (asn1.c) accept a raw pointer but no buffer length parameter, and trust attacker-controlled BER length fields without validating them against actual buffer boundaries. All primitive decoders are affected: ber_decode_INTEGER, ber_decode_SEQUENCE, ber_decode_OCTET_STRING, ber_decode_BIT_STRING, and ber_decode_CHOICE. Additionally, ber_decode_INTEGER can produce integer underflows when the encoded length is zero. An attacker supplying a malformed BER-encoded cryptographic object through PKCS#11 operations such as C_CreateObject or C_UnwrapKey, token loading from disk, or remote backend communication can trigger out-of-bounds reads. This affects all token backends (Soft, ICA, CCA, TPM, EP11, ICSF) since the vulnerable code is in the shared common library. A patch is available thorugh commit ed378f463ef73364c89feb0fc923f4dc867332a3.","aliases":["GHSA-c9cf-6vr4-wfxm"],"modified":"2026-06-26T15:29:11.737475891Z","published":"2026-04-16T22:04:44.005Z","related":["ALSA-2026:26352","ALSA-2026:28256","SUSE-SU-2026:1658-1","SUSE-SU-2026:1723-1","SUSE-SU-2026:21419-1","SUSE-SU-2026:21455-1","SUSE-SU-2026:21492-1","SUSE-SU-2026:21575-1","SUSE-SU-2026:21593-1","SUSE-SU-2026:21637-1","SUSE-SU-2026:2355-1","openSUSE-SU-2026:10593-1","openSUSE-SU-2026:20699-1"],"database_specific":{"cna_assigner":"GitHub_M","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40253.json","cwe_ids":["CWE-125"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40253.json"},{"type":"ADVISORY","url":"https://github.com/opencryptoki/opencryptoki/security/advisories/GHSA-c9cf-6vr4-wfxm"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40253"},{"type":"FIX","url":"https://github.com/opencryptoki/opencryptoki/commit/ed378f463ef73364c89feb0fc923f4dc867332a3"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/opencryptoki/opencryptoki","events":[{"introduced":"0"},{"fixed":"ed378f463ef73364c89feb0fc923f4dc867332a3"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"extracted_events":[{"introduced":"0"},{"last_affected":"3.26.0"}],"cpe":"cpe:2.3:a:opencryptoki_project:opencryptoki:*:*:*:*:*:*:*:*"}}],"versions":["v3.26.0","v3.25.0","v3.24.0","v3.23.0","v3.22.0","v3.21.0","v3.20.0","v3.19.0","v3.18.0","v3.17.0","v3.16.0","v3.15.1","v3.15.0","v3.14.0","v3.13.0","v3.12.1","v3.12.0","v3.11.1","v3.11.0","v3.10.0","v3.9.0","v3.8.2","v3.8.0","v3.8.1","v3.7.0","v3.6.2","v3.6.1","v3.6","v3.5","v3.4.1","v3.4","v3.3","v3.2","v3.1","v2.4.3.1","v3.0","v2.4.3","v2.3.3","v2.3.2"],"database_specific":{"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2026-40253.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H"}]}