On Tuesday, November 1, OpenSSL will release version 3.0.7 which will fix a CRITICAL security vulnerability: Forthcoming OpenSSL Releases
If you run OpenSSL 3.0 (the latest available version), you will need to patch immediatly.
OpenSSL LTS version 1.1.1 is not susceptible to this bug: Forthcoming OpenSSL Bug Fix Release (despite a bugfix release 1.1.1s will be made in parallel).
Doesn't seem quite that bad (the vulnerability since been downgraded to HIGH), though of course everyone should be ensuring their systems are always up-to-date on patches anyway.