{"timestamp":"2026-06-10T16:01:11.685759Z","id":"CVE-2026-34181","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}

[{"vendor":"OpenSSL","product":"OpenSSL","defaultStatus":"unaffected","versions":[{"version":"4.0.0","lessThan":"4.0.1","versionType":"semver","status":"affected"},{"version":"3.6.0","lessThan":"3.6.3","versionType":"semver","status":"affected"},{"version":"3.5.0","lessThan":"3.5.7","versionType":"semver","status":"affected"},{"version":"3.4.0","lessThan":"3.4.6","versionType":"semver","status":"affected"}]}]

OR
          *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.4.0 up to (excluding) 3.4.6
          *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.5.0 up to (excluding) 3.5.7
          *cpe:2.3:a:openssl:openssl:*:*:*:*:*:*:*:* versions from (including) 3.6.0 up to (excluding) 3.6.3
          *cpe:2.3:a:openssl:openssl:4.0.0:-:*:*:*:*:*:*

OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/0300eb9ddce7a0895bf301a4b0c03a9da2313a0f Types: Patch

OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/79eb76a937e474bb7610a0a3dc57131dc8dc6610 Types: Patch

OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/85dcbb3abaa4878af5c8fbbe11bce708fcf984a7 Types: Patch

OpenSSL Software Foundation: https://github.com/openssl/openssl/commit/ec36f2417c4ddd8cabce4b4a60a3d7a7365f2d81 Types: Patch

OpenSSL Software Foundation: https://openssl-library.org/news/secadv/20260609.txt Types: Vendor Advisory

AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N

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://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

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.

CWE-354

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://openssl-library.org/news/secadv/20260609.txt