Out-of-bounds Read Affecting opencryptoki-debuginfo package, versions <0:3.24.0-6.el10_0.2


Severity

Recommended
0.0
medium
0
10

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.16% (6th percentile)

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  • Snyk IDSNYK-RHEL10-OPENCRYPTOKIDEBUGINFO-17899552
  • published9 Jul 2026
  • disclosed16 Apr 2026

Introduced: 16 Apr 2026

CVE-2026-40253  (opens in a new tab)
CWE-125  (opens in a new tab)

How to fix?

Upgrade RHEL:10 opencryptoki-debuginfo to version 0:3.24.0-6.el10_0.2 or higher.
This issue was patched in RHSA-2026:36697.

NVD Description

Note: Versions mentioned in the description apply only to the upstream opencryptoki-debuginfo package and not the opencryptoki-debuginfo package as distributed by RHEL. See How to fix? for RHEL:10 relevant fixed versions and status.

openCryptoki is a PKCS#11 library and provides tooling for Linux and AIX. In versions 3.26.0 and below, the BER/DER decoding functions in the shared common library (asn1.c) accept a raw pointer but no buffer length parameter, and trust attacker-controlled BER length fields without validating them against actual buffer boundaries. All primitive decoders are affected: ber_decode_INTEGER, ber_decode_SEQUENCE, ber_decode_OCTET_STRING, ber_decode_BIT_STRING, and ber_decode_CHOICE. Additionally, ber_decode_INTEGER can produce integer underflows when the encoded length is zero. An attacker supplying a malformed BER-encoded cryptographic object through PKCS#11 operations such as C_CreateObject or C_UnwrapKey, token loading from disk, or remote backend communication can trigger out-of-bounds reads. This affects all token backends (Soft, ICA, CCA, TPM, EP11, ICSF) since the vulnerable code is in the shared common library. A patch is available thorugh commit ed378f463ef73364c89feb0fc923f4dc867332a3.

CVSS Base Scores

version 3.1