Cryptographic Flaw in Cloudflare CIRCL FourQ (CVE-2025-8556)

Sun, 12 Jul 2026 11:56:34 +0000

Engineer — Plan: If your Go codebase depends on github.com/cloudflare/circl and uses the FourQ elliptic curve (key exchange or signatures), audit that usage and schedule an upgrade; EPSS is 0.00 and no KEV listing, but a public PoC exists and cryptographic correctness flaws can enable key-recovery or signature-forgery scenarios.
SOC/IR — Skip
Leader — Skip
Signals: CVE-2025-8556 — CISA KEV: not listed, EPSS 0.00, public PoC on GitHub

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