CVE-2026-33814 — Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net

Affected: golang.org/x/net/http2, Go standard library net/http, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 10.0 Extended Update Support, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions, Red Hat Enterprise Linux 9.6 Extended Update Support, Red Hat OpenShift Container Platform 4.16 and 97 more

When processing HTTP/2 SETTINGS frames, transport will enter an infinite loop of writing CONTINUATION frames if it receives a SETTINGS_MAX_FRAME_SIZE with a value of 0.

GHSA-x4mj-7f9g-29h4 — Contour has Lua code injection via Cookie Path Rewrite Policy

Affected: Go: github.com/projectcontour/contour

### Impact

Contour's [Cookie Rewriting](https://projectcontour.io/docs/1.33/config/cookie-rewriting/) feature is vulnerable to Lua code injection. An attacker with RBAC permissions to create or modify `HTTPProxy` resources can craft a malicious value in the following fields that results in arbitrary code execution in the Envoy proxy:

- `spec.routes[].cookieRewritePolicies[].pathRewrite.value` - `spec.routes[].services[].cookieRewritePolicies[].pathRewrite.value`

The cookie rewriting feature is internally implemented using Envoy's [HTTP Lua filter](https://www.envoyproxy.io/docs/envoy/latest/configuration/http/http_filters/lua_filter). User-controlled values are interpolated into Lua source code using Go `text/template` without sufficient sanitization.

The injected code only executes when processing traffic on the attacker's own route, which they already control. However, since Envoy runs as shared infrastructure, the injected code can also:

- Read Envoy's xDS client credentials from the filesystem, which could be used to read all Contour xDS configuration, including TLS certificates and private keys of other tenants. - Cause denial of service for other tenants sharing the Envoy instance.

Other use cases of Lua filter are not vulnerable.

### Patches

The fix is available in Contour [v1.33.4](https://github.com/projectcontour/contour/releases/tag/v1.33.4), [v1.32.5](https://github.com/projectcontour/contour/releases/tag/v1.32.5), and [v1.31.6](https://github.com/project…

Most recent entries from all

CVE-2026-33814 — Infinite loop in HTTP/2 transport when given bad SETTINGS_MAX_FRAME_SIZE in net/http/internal/http2 in golang.org/x/net

GHSA-x4mj-7f9g-29h4 — Contour has Lua code injection via Cookie Path Rewrite Policy