{"id":"CVE-2025-66038","summary":"OpenSC: `sc_compacttlv_find_tag` can return out-of-bounds pointers","details":"OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, sc_compacttlv_find_tag searches a compact-TLV buffer for a given tag. In compact-TLV, a single byte encodes the tag (high nibble) and value length (low nibble). With a 1-byte buffer {0x0A}, the encoded element claims tag=0 and length=10 but no value bytes follow. Calling sc_compacttlv_find_tag with search tag 0x00 returns a pointer equal to buf+1 and outlen=10 without verifying that the claimed value length fits within the remaining buffer. In cases where the sc_compacttlv_find_tag is provided untrusted data (such as being read from cards/files), attackers may be able to influence it to return out-of-bounds pointers leading to downstream memory corruption when subsequent code tries to dereference the pointer. This issue has been patched in version 0.27.0.","aliases":["GHSA-72x5-fwjx-2459"],"modified":"2026-07-01T09:59:09.483581071Z","published":"2026-03-30T17:03:55.914Z","related":["SUSE-SU-2026:1477-1","SUSE-SU-2026:21283-1","SUSE-SU-2026:21320-1","SUSE-SU-2026:22114-1","SUSE-SU-2026:22126-1","SUSE-SU-2026:2657-1","SUSE-SU-2026:2697-1","openSUSE-SU-2026:10475-1","openSUSE-SU-2026:20967-1"],"database_specific":{"cwe_ids":["CWE-126"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66038.json","cna_assigner":"GitHub_M"},"references":[{"type":"WEB","url":"https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66038"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66038.json"},{"type":"ADVISORY","url":"https://github.com/OpenSC/OpenSC/security/advisories/GHSA-72x5-fwjx-2459"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66038"},{"type":"FIX","url":"https://github.com/OpenSC/OpenSC/commit/6db171bcb6fd7cb3b51098fefbb3b28e44f0a79c"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/opensc/opensc","events":[{"introduced":"0"},{"fixed":"aca07679a6dd281ee6411f5e7de2ed0ee796bee8"},{"fixed":"6db171bcb6fd7cb3b51098fefbb3b28e44f0a79c"}],"database_specific":{"cpe":"cpe:2.3:a:opensc_project:opensc:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"0.27.0"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["0.27.0-rc2","tag-test","0.27.0-rc1","0.26.0","0.26.0-rc1","0.25.0","0.25.0-rc1","0.24.0","0.24.0-rc2","0.24.0-rc1","0.23.0","0.23.0-rc2","0.23.0-rc1","0.22.0","0.22.0-rc2","0.22.0-rc1","0.21.0","0.21.0-rc2","0.21.0-rc1","0.20.0","0.20.0-rc4","0.20.0-rc3","0.20.0-rc2","0.20.0-rc1","0.19.0","0.19.0-rc1","0.18.0","0.18.0-rc2","0.18.0-rc1","0.17.0","0.17.0-rc2","0.17.0-rc1","0.16.0","v0.16.0-pre1","0.15.0","0.14.0","0.14.0rtm","0.14.0rc2","0.13.0","0.13.0rc1","0.13.0pre1","v0.12.2","0.12.2","0.12.2-rc1"],"database_specific":{"vanir_signatures_modified":"2026-06-18T13:17:17Z","vanir_signatures":[{"deprecated":false,"digest":{"line_hashes":["197077062409851014049150881454686052651","116874431869949048830812280705968601837","178347451590943443467517413724441716670","64384897257287561373260242149812150104","128939127976228477246498514475977417660","328551807216414904676468422493279414826","275193146505267519530501610440190952955","125295909231836846075869067429066912866","92530406835395599398656616018502244074"],"threshold":0.9},"signature_type":"Line","target":{"file":"src/libopensc/card-idprime.c"},"id":"CVE-2025-66038-7af18f0d","signature_version":"v1","source":"https://github.com/opensc/opensc/commit/6db171bcb6fd7cb3b51098fefbb3b28e44f0a79c"}],"source":"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-66038.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"}]}