There are 2 open security issues in bullseye.
2 issues left for the package maintainer to handle:
rtl_433 21.12 was discovered to contain a stack overflow in the function somfy_iohc_decode(). This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted file.
An Off-by-one Error occurs in cmr113_decode of rtl_433 21.12 when decoding a crafted file.
You can find information about how to handle these issues in the security team's documentation.