{"id":"AZL-81192","summary":"CVE-2025-66038 affecting package opensc 0.27.1-2","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":"2026-08-29T05:27:27Z","published":"2026-03-30T18:16:18Z","upstream":["CVE-2025-66038"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2025-66038"}],"affected":[{"package":{"name":"opensc","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/opensc"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"0.27.1-2"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-81192.json"}}],"schema_version":"1.9.0"}