Out-of-bounds Read Affecting opensc package, versions <0.27.1-1


Severity

Recommended
0.0
medium
0
10

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Threat Intelligence

EPSS
0.25% (17th percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-OPENSC-15886466
  • published4 Apr 2026
  • disclosed30 Mar 2026

Introduced: 30 Mar 2026

CVE-2025-66037  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade Debian:unstable opensc to version 0.27.1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream opensc package and not the opensc package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1