{"id":"DEBIAN-CVE-2025-66038","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.","modified":"2026-09-01T16:06:20.894146497Z","published":"2026-03-30T18:16:18.177Z","upstream":["CVE-2025-66038"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-66038"}],"affected":[{"package":{"name":"opensc","ecosystem":"Debian:12","purl":"pkg:deb/debian/opensc?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.23.0-0.3","0.23.0-0.3+deb12u1","0.23.0-0.3+deb12u2","0.23.0-1","0.23.0-2","0.24.0~rc1-1","0.25.0~rc1-1","0.25.1-1","0.25.1-2","0.25.1-2.1","0.26.0-1","0.26.1-1","0.26.1-2","0.26.1-3","0.27.0~rc1-1","0.27.0~rc2-1","0.27.1-1","0.27.1-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-66038.json"}},{"package":{"name":"opensc","ecosystem":"Debian:13","purl":"pkg:deb/debian/opensc?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.26.1-2","0.26.1-3","0.27.0~rc1-1","0.27.0~rc2-1","0.27.1-1","0.27.1-2"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-66038.json"}},{"package":{"name":"opensc","ecosystem":"Debian:14","purl":"pkg:deb/debian/opensc?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.27.0~rc1-1"}]}],"versions":["0.26.1-2","0.26.1-3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2025-66038.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}