Node.js versions before 10.23.1, 12.20.1, 14.15.4, 15.5.1 allow two copies of a header field in an HTTP request (for example, two Transfer-Encoding header fields). In this case, Node.js identifies the first header field and ignores the second. This can lead to HTTP Request Smuggling.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-8287
• https://hackerone.com/reports/1002188
• https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/H472D5HPXN6RRXCNFML3BK5OYC52CXF2/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/K4I6MZNC7C7VIDQR267OL4TVCI3ZKAC4/
• https://nodejs.org/en/blog/vulnerability/january-2021-security-releases/
• https://security.gentoo.org/glsa/202101-07
• https://security.netapp.com/advisory/ntap-20210212-0003/
• https://www.debian.org/security/2021/dsa-4826
• https://www.oracle.com/security-alerts/cpujan2021.html
• https://lists.debian.org/debian-lts-announce/2022/12/msg00009.html