Improper Verification of Cryptographic Signature Affecting openssl package, versions <1:3.5.5-4.el9_8


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.2% (11th percentile)

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  • Snyk IDSNYK-RHEL9-OPENSSL-17323841
  • published12 Jun 2026
  • disclosed9 Jun 2026

Introduced: 9 Jun 2026

NewCVE-2026-34181  (opens in a new tab)
CWE-347  (opens in a new tab)

How to fix?

Upgrade RHEL:9 openssl to version 1:3.5.5-4.el9_8 or higher.
This issue was patched in RHSA-2026:25239.

NVD Description

Note: Versions mentioned in the description apply only to the upstream openssl package and not the openssl package as distributed by RHEL. See How to fix? for RHEL:9 relevant fixed versions and status.

Issue Summary: The PKCS#12 file processing fails to perform sufficient input validation for files that use Password-Based Message Authentication Code 1 (PBMAC1) integrity mechanism allowing a certificate and private key forgery.

Impact Summary: An attacker impersonating a user can cause a service reading PKCS#12 files to accept forged certificates and private keys with a 1 in 256 probability.

If a service accepting PKCS#12 files is using passwords for authenticating the received files, the attacker can create unencrypted PKCS#12 files that use PBMAC1 authentication that specifies an HMAC key of only one byte, allowing them to craft a file that will be accepted with a 1 in 256 probability. That would then cause the service to accept a certificate and private key controlled by the attacker.

The FIPS modules are not affected by this issue, as the affected code is outside the OpenSSL FIPS module boundary.

CVSS Base Scores

version 3.1