OpenSC: `sc_compacttlv_find_tag` can return out-of-bounds pointers

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Summary

CVECVE-2025-66038
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-03-30 18:16:18 UTC
Updated2026-04-01 17:40:36 UTC
DescriptionOpenSC 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.

Risk And Classification

Primary CVSS: v3.1 6.8 MEDIUM from [email protected]

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000150000 probability, percentile 0.032870000 (date 2026-04-01)

Problem Types: CWE-126 | CWE-126 CWE-126: Buffer Over-read

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary6.8MEDIUMCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1[email protected]Secondary3.9LOWCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
3.1CNADECLARED3.9LOWCVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L

CVSS v3.1 Breakdown

Attack Vector
Physical
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Opensc Project Opensc All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA OpenSC OpenSC affected < 0.27.0 Not specified

References

ReferenceSourceLinkTags
github.com/OpenSC/OpenSC/commit/6db171bcb6fd7cb3b51098fefbb3b28e44f0a79c [email protected] github.com Patch
github.com/OpenSC/OpenSC/security/advisories/GHSA-72x5-fwjx-2459 [email protected] github.com Exploit, Vendor Advisory
github.com/OpenSC/OpenSC/wiki/CVE-2025-66038 [email protected] github.com Vendor Advisory
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