diff --git a/reports/GO-2021-0226.yaml b/reports/GO-2021-0226.yaml
new file mode 100644
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--- /dev/null
+++ b/reports/GO-2021-0226.yaml
@@ -0,0 +1,31 @@
+module: std
+package: net/http/cgi
+versions:
+- fixed: go1.14.8
+- fixed: go1.15.1
+description: |
+  When a Handler does not explicitly set the Content-Type header, the the
+  package would default to “text/html”, which could cause a Cross-Site Scripting
+  vulnerability if an attacker can control any part of the contents of a
+  response.
+
+  The Content-Type header is now set based on the contents of the first Write
+  using http.DetectContentType, which is consistent with the behavior of the
+  net/http package.
+
+  Although this protects some applications that validate the contents of
+  uploaded files, not setting the Content-Type header explicitly on any
+  attacker-controlled file is unsafe and should be avoided.
+cves:
+- CVE-2020-24553
+credit: RedTeam Pentesting GmbH
+symbols:
+- response.Write
+- response.WriteHeader
+- response.writeCGIHeader
+links:
+  pr: https://go.dev/cl/252179
+  commit: https://go.googlesource.com/go/+/4f5cd0c0331943c7ec72df3b827d972584f77833
+  context:
+  - https://groups.google.com/g/golang-announce/c/8wqlSbkLdPs
+  - https://go.dev/issue/40928