CVE-2021-4236: NULL Pointer Dereference

December 28, 2022 (updated January 6, 2023)

Web Sockets do not execute any AuthenticateMethod methods which may be set, leading to a nil pointer dereference if the returned UserData pointer is assumed to be non-nil, or authentication bypass. This issue only affects WebSockets with an AuthenticateMethod hook. Request handlers that do not explicitly use WebSockets are not vulnerable.

References

github.com/advisories/GHSA-jpgg-cp2x-qrw3
github.com/ecnepsnai/web/commit/5a78f8d5c41ce60dcf9f61aaf47a7a8dc3e0002f
nvd.nist.gov/vuln/detail/CVE-2021-4236
pkg.go.dev/vuln/GO-2021-0107

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