Input validation error in OpenSSL - CVE-2026-34182
Published: June 10, 2026
Vulnerability identifier: #VU134271
CSH Severity: High
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N/E:U/U:Amber
CVE-ID: CVE-2026-34182
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: OpenSSL Software Foundation
Affected software:
OpenSSL
OpenSSL
Detailed vulnerability description
The vulnerability allows a remote attacker to bypass integrity validation.
The vulnerability exists due to improper input validation in CMS AuthEnvelopedData processing when decrypting crafted AuthEnvelopedData containers. A remote attacker can send a specially crafted CMS message to bypass integrity validation.
In some cases, if the application exposes decryption success or failure, the issue can be used as an oracle to obtain key-equivalent functionality for the content-encryption key.
How to mitigate CVE-2026-34182
Install security update from vendor's website.