fix: patch otel baggage DoS and Go stdlib crypto CVEs#36
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Pulls in go.opentelemetry.io/otel v1.41.0 transitively, which fixes GHSA-mh2q-q3fh-2475 (CVE-2026-29181): multi-value baggage header extraction allows DoS amplification by aggregating members across header values past per-value parse limits. This service does not extract baggage headers, so exploitability is nil — the bump silences the scanner alert and keeps the dependency tree current. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Picks up four stdlib fixes flagged by govulncheck: - GO-2026-4870 (TLS 1.3 KeyUpdate DoS) - GO-2026-4866 (case-sensitive excludedSubtrees auth bypass) - GO-2026-4946 (inefficient policy validation) - GO-2026-4947 (unbounded chain building work) All four are reachable from this binary via http.ListenAndServe and the ClickHouse client's TLS dialers. Dockerfile is bumped from golang:1.25-alpine to golang:1.26-alpine so produced images carry the patched stdlib. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
go.mod now declares go 1.26.2 (for crypto/tls and crypto/x509 CVE fixes), so the README's "Go 1.25+" line was stale. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
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Closes Dependabot alert #4 (GHSA-mh2q-q3fh-2475) and clears four Go stdlib CVEs flagged by govulncheck.
Changes
Pulls in go.opentelemetry.io/otel v1.39.0 → v1.41.0, fixing GHSA-mh2q-q3fh-2475 / CVE-2026-29181 (multi-value baggage header DoS amplification). This service does not extract baggage headers, so practical exposure is nil — the bump silences the scanner alert.
Reachable from http.ListenAndServe (/healthz, /metrics) and the ClickHouse client's TLS dialers.