CVE-2021-22959: Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')

November 15, 2021 (updated December 9, 2022)

The llhttp parser accepts requests with a space (SP) right after the header name before the colon. This can lead to HTTP Request Smuggling (HRS).

References

hackerone.com/reports/1238709
nvd.nist.gov/vuln/detail/CVE-2021-22959

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