2026-09-21
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- vulnerabilities
Not another Log4Shell: inside the Log4j 2 deserialization allowlist bypass
A Java deserialization vulnerability exists in Log4j 2.26.1 that bypasses the allowlist protection mechanism. Exploitation requires two additional components beyond Log4j itself to achieve command execution. The article details the bypass mechanics, affected versions, and detection guidance.
Why it matters: Development teams and security operations centers running Log4j 2.26.1 need to evaluate whether their environment has the additional dependencies required for exploitation and apply mitigations if at risk.