{"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":"2026-04-21T08:29:17.655702244Z","published":"2026-03-30T17:03:55.914Z","related":["SUSE-SU-2026:1477-1","openSUSE-SU-2026:10475-1"],"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":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66038.json"},{"type":"FIX","url":"https://github.com/OpenSC/OpenSC/commit/6db171bcb6fd7cb3b51098fefbb3b28e44f0a79c"},{"type":"ADVISORY","url":"https://github.com/OpenSC/OpenSC/security/advisories/GHSA-72x5-fwjx-2459"},{"type":"WEB","url":"https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66038"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66038"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/opensc/opensc","events":[{"introduced":"0"},{"fixed":"aca07679a6dd281ee6411f5e7de2ed0ee796bee8"}],"database_specific":{"versions":[{"introduced":"0"},{"fixed":"0.27.0"}]}}],"versions":["0.12.2","0.12.2-rc1","0.13.0","0.13.0pre1","0.13.0rc1","0.14.0","0.14.0rc2","0.14.0rtm","0.15.0","0.16.0","0.17.0","0.17.0-rc1","0.17.0-rc2","0.18.0","0.18.0-rc1","0.18.0-rc2","0.19.0","0.19.0-rc1","0.20.0","0.20.0-rc1","0.20.0-rc2","0.20.0-rc3","0.20.0-rc4","0.21.0","0.21.0-rc1","0.21.0-rc2","0.22.0","0.22.0-rc1","0.22.0-rc2","0.23.0","0.23.0-rc1","0.23.0-rc2","0.24.0","0.24.0-rc1","0.24.0-rc2","0.25.0","0.25.0-rc1","0.26.0","0.26.0-rc1","0.27.0-rc1","0.27.0-rc2","tag-test","v0.12.2","v0.16.0-pre1"],"database_specific":{"source":"https://storage.googleapis.com/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"}]}