| Package | Affected versions | Patched versions |
|---|---|---|
| envoy | ≥ 1.23.0, < 1.23.12≥ 1.24.0, < 1.24.10≥ 1.25.0, < 1.25.9≥ 1.26.0, < 1.26.4 | 1.23.121.24.101.25.91.26.4 |
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 unencrypted connections. With a fix in versions 1.27.0, 1.26.4, 1.25.9, 1.24.10, and 1.23.12, Envoy will now lowercase scheme values by default, and change the internal scheme checks that were case-sensitive to be case-insensitive. There are no known workarounds for this issue.
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