Bump go directive to 1.26.4 to fix stdlib CVEs#4334
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Fixes GO-2026-5039 (net/textproto error message injection) and GO-2026-5037 (crypto/x509 VerifyHostname quadratic DoS), both fixed in Go 1.26.4. The Dockerfile already builds with golang:1.26.4; this aligns the go.mod directive used by the govulncheck scan. Assisted by AI
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Summary
godirective ingo.modfrom1.26.3to1.26.4.The Dockerfile already builds with
golang:1.26.4-alpine; thego.moddirective is what pins the govulncheck scan (and the toolchain it resolves) to the vulnerable1.26.3stdlib. Bumping it clears the scan. No code changes.Fixes the following vulnerabilities:
net/textprotocrypto/x509VerifyHostnamescales quadratically over large DNS SAN lists, enabling DoS on untrusted certs (CVE-2026-27145)Both are fixed in Go 1.26.4.
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