Description
OpenSC is an open source smart card tools and middleware. Prior to version 0.27.0, feeding a crafted input to the fuzz_pkcs15_reader harness causes OpenSC to perform an out-of-bounds heap read in the X.509/SPKI handling path. Specifically, sc_pkcs15_pubkey_from_spki_fields() allocates a zero-length buffer and then reads one byte past the end of that allocation. This issue has been patched in version 0.27.0.
References (2)
Core 2
Core References
X_Refsource_Confirm x_refsource_confirm
https://github.com/OpenSC/OpenSC/security/advisories/GHSA-m58q-rmjm-mmfx
X_Refsource_Misc x_refsource_misc
https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66037
Scores
CVSS v3
3.9
EPSS
0.0001
EPSS Percentile
0.7%
Attack Vector
PHYSICAL
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-125
Status
published
Products (2)
OpenSC/OpenSC
< 0.27.0
opensc_project/opensc
< 0.27.0
Published
Mar 30, 2026
Tracked Since
Mar 30, 2026