PT-2026-29082 · Opensc · Opensc

Published 2026-03-30 · Updated 2026-03-30 · CVE-2025-66038

NVD

CVSS v3.1

3.9

Low

AV:P/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

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.

Exploit

Fix

Buffer Over-read

Weakness Enumeration

CWE-126

Related Identifiers

CVE-2025-66038

Affected Products

Opensc

References · 4

• 🔥 https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66038 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2025-66038 · Security Note
• https://github.com/OpenSC/OpenSC/commit/6db171bcb6fd7cb3b51098fefbb3b28e44f0a79c · Note
• https://github.com/OpenSC/OpenSC/security/advisories/GHSA-72x5-fwjx-2459 · Note