Improper Verification of Cryptographic Signature The advisory has been revoked - it doesn't affect any version of package shim-ia32 (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CENTOS8-SHIMIA32-17309505
- published11 Jun 2026
- disclosed9 Jun 2026
Introduced: 9 Jun 2026
NewCVE-2026-34181 (opens in a new tab)Amendment
The Centos security team deemed this advisory irrelevant for Centos:8.
NVD Description
Note: Versions mentioned in the description apply only to the upstream shim-ia32 package and not the shim-ia32 package as distributed by Centos.
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.
References
- https://access.redhat.com/security/cve/CVE-2026-34181
- https://github.com/openssl/security/commit/0300eb9ddce7a0895bf301a4b0c03a9da2313a0f
- https://github.com/openssl/security/commit/79eb76a937e474bb7610a0a3dc57131dc8dc6610
- https://github.com/openssl/security/commit/85dcbb3abaa4878af5c8fbbe11bce708fcf984a7
- https://github.com/openssl/security/commit/ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81
- https://github.com/openssl/openssl/commit/0300eb9ddce7a0895bf301a4b0c03a9da2313a0f
- https://github.com/openssl/openssl/commit/79eb76a937e474bb7610a0a3dc57131dc8dc6610
- https://github.com/openssl/openssl/commit/85dcbb3abaa4878af5c8fbbe11bce708fcf984a7
- https://github.com/openssl/openssl/commit/ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81
- https://openssl-library.org/news/secadv/20260609.txt