CVE-2025-66037

EUVD-2025-209126
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
GitHub_MCNA
3.9 LOW
PHYSICAL
HIGH
NONE
CVSS:3.1/AV:P/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: 16.84%
Affected Products (NVD)
VendorProductVersion
opensc_projectopensc
𝑥
< 0.27.0
𝑥
= Vulnerable software versions
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
opensc-projectopensc
𝑥
< 0.27.0
CNA
Debian logo
Debian Releases
Debian Product
Codename
opensc
bookworm
no-dsa
bullseye
postponed
bullseye (security)
vulnerable
forky
0.27.1-2
fixed
sid
0.27.1-2
fixed
trixie
no-dsa
Ubuntu logo
Ubuntu Releases
Ubuntu Product
Codename
opensc
bionic
needs-triage
focal
needs-triage
jammy
needs-triage
noble
needs-triage
questing
ignored
resolute
needs-triage
xenial
ignored
Azure Linux logo
Azure Linux Releases
Azure Package
Release
opensc
Azure Linux 3.0
0:0.27.1-1.azl3
fixed
Common Weakness Enumeration
References
https://github.com/OpenSC/OpenSC/security/advisories/GHSA-m58q-rmjm-mmfx
https://github.com/OpenSC/OpenSC/wiki/CVE-2025-66037