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CVE-2023-35944

Incorrect handling of HTTP requests and responses with mixed case schemes in Envoy

Severity
Medium 5.3
Published
25 Jul 2023
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
1.23.12, 1.24.10, 1.25.9, 1.26.4
Also known as
GHSA-pvgm-7jpg-pw5g
Sources
NVD, Project advisories (GitHub)

Description

Envoy is an open source edge and service proxy designed for cloud-native applications. Envoy allows mixed-case schemes in HTTP/2, however, some internal scheme checks are case-sensitive. Prior to versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, this can lead to the rejection of requests with mixed-case schemes such as `htTp` or `htTps`, or the bypassing of some requests such as `https` in…

Affected software

SoftwareAffected versions
EnvoyServers and applications · cpe:a:envoyproxy:envoy
  • From 1.23.0 before 1.23.12
  • From 1.24.0 before 1.24.10
  • From 1.25.0 before 1.25.9
  • From 1.26.0 before 1.26.4
EnvoyServers and applications · github:envoyproxy/envoy
  • Every version before 1.23.12

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2023-35944
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2023-35944
  • GitHub Advisory Database https://github.com/advisories/GHSA-pvgm-7jpg-pw5g
  • github.com https://github.com/envoyproxy/envoy/security/advisories/GHSA-pvgm-7jpg-pw5g