Releases — RATATOSK

Contourv1.33.5Networking & MessagingMay 28, 2026

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A maintenance release with a security fix for invalid HTTPProxy configurations and an update to golang.org/x/net. It also updates the Go toolchain to 1.25.10 and is tested against Kubernetes 1.32 through 1.34.

Action needed (1)

securitycriticalgolang.org/x/net updated to v0.55.0, CVE-2026-39821
Contour v1.33.5 updates golang.org/x/net to v0.55.0. The change addresses CVE-2026-39821.

Check if affected (1)

securitymediumInvalid HTTPProxy configuration rejected, GHSA-g3xr-5w5j-w4q4
Applies if you configure HTTPProxy with a fallback certificate and enable JWT verification.
Contour rejects an invalid HTTPProxy configuration in which a fallback certificate is configured with JWT verification. This prevents requests without TLS SNI or with unrecognized SNI from bypassing JWT verification. Advisory: GHSA-g3xr-5w5j-w4q4.

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