CVE-2025-66037
Low
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.
SeverityLow
CVSS3.9
Exploit probability—
ProductOpensc
PublishedMar 30, 2026
First seenMar 30, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Update
- opensc_project opensc0.27.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| opensc_project opensc | v < 0.27.0 | 0.27.0 |
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