add CVE-2021-32823 for bindata (#483)

Author: rschultheis

Diff for: gems/bindata/CVE-2021-32823.yml

@@ -0,0 +1,19 @@
+---
+gem: bindata
+cve: 2021-32823
+ghsa: hj56-84jw-67h6
+url: https://github.com/rubysec/ruby-advisory-db/issues/476
+date: 2021-05-18
+title: Potential Denial-of-Service in bindata
+description: |
+  In bindata before version 2.4.10, there is a potential denial-of-service
+  vulnerability. In affected versions, it is very slow for certain classes in BinData
+  to be created. For example BinData::Bit100000, BinData::Bit100001, BinData::Bit100002,
+  BinData::Bit<N>. In combination with `<user_input>.constantize` there is a potential
+  for a CPU-based DoS. In version 2.4.10, bindata improved the creation time of Bits
+  and Integers.
+
+cvss_v3: 3.7
+
+patched_versions:
+- ">= 2.4.10"