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repo: Release v1.37.6

Summary of changes:

  • Security fixes:
  • CVE-2026-73511: url normalization: strip path parameters from individual path segments per RFC 3986 section 3.3. Revert with envoy.reloadable_features.strip_path_parameters_per_segment.
  • CVE-2026-73512: http3: UAF on a specifically timed sequence of HTTP/3 frames.
  • CVE-2026-73513: http2: abnormal process termination on trailers received without the END_STREAM flag.
  • CVE-2026-73546: admin: sanitize stat names before converting them to HTML. Guarded by envoy.reloadable_features.sanitize_html_stats_names.
  • CVE-2026-73547: ext_authz: abnormal process termination on requests without a URI path (i.e. CONNECT).
  • CVE-2026-73548: http: payload sent before a generic HTTP upgrade was accepted could be interpreted as a pipelined HTTP/1 request and poison a shared upstream connection. Revert with envoy.reloadable_features.http_pause_generic_upgrade_request_body.
  • CVE-2026-73549: quic: crash handling scoped IPv6 addresses in QUIC client connections and Original Dst clusters.
  • CVE-2026-73550: http2: dropped Host headers now count towards request header map size and count limits. Revert with envoy.reloadable_features.http2_track_size_of_dropped_host_header.
  • CVE-2026-73551: url normalization: strip path parameters from dot and dotdot segments (/.;, /..;) so canonicalization interprets them correctly. Applies only when normalize_path is enabled; revert with envoy.reloadable_features.strip_dotdot_segments_with_parameters.
  • CVE-2026-73552: safe_regex: switch charset mode from UTF-8 to Latin1, as HTTP headers are not UTF-8 encoded. Revert with envoy.reloadable_features.re2_use_latin1_mode.
  • CVE-2026-73553: rbac: RBAC path matching now respects the route's ignore_path_parameters_in_path_matching, preventing authz bypass via appended path parameters. Revert with envoy.reloadable_features.rbac_respect_ignore_path_parameters.
  • CVE-2026-50572: ext_authz: UAF when ext_authz over HTTP causes a request to be rejected.

  • CVE-2026-48521: http3: abnormal process termination when upstream protocol is selected via ALPN and the server uses HTTP/3.

  • Bug fixes:

  • http: fixed a filter manager bug where a body frame moved into the filter-manager buffer via addDecodedData()/addEncodedData() immediately before returning Continue was silently dropped, corrupting large streamed bodies. Revert with envoy.reloadable_features.filter_manager_forward_added_data_on_continue.
  • ext_proc: fixed multiple lifetime bugs in the ext_proc filter and the underlying gRPC async client that could lead to use-after-free or double delivery of callbacks.
  • ext_proc: fixed a bug where unnecessary empty data chunks were processed by the filter chain. Revert with envoy.reloadable_features.ext_proc_return_stop_iteration.
  • router: fixed a lifetime bug in dynamic forward proxy async host selection when the cluster is removed while lookup is still pending.

Docker images: https://hub.docker.com/r/envoyproxy/envoy/tags?page=1&name=v1.37.6 Docs: https://www.envoyproxy.io/docs/envoy/v1.37.6/ Release notes: https://www.envoyproxy.io/docs/envoy/v1.37.6/version_history/v1.37/v1.37.6 Full changelog: https://github.com/envoyproxy/envoy/compare/v1.37.5...v1.37.6

Source: README.md, updated 2026-08-26