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526
Cloudflare Error 526: Invalid SSL certificate
Critical✕ Not retryable · fix the payloadHTTP 526 Invalid SSL CertificateCDN / Edge
TL;DR · 10-second read
In Full (strict) mode the origin certificate is expired, self-signed or does not cover the hostname. Renew it or install a Cloudflare Origin CA certificate.
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What you see · exact log / response
Error 526 Ray ID: 8d2fc18fa0bd6c57 • 2026-10-12 05:33:48 UTC Invalid SSL certificate
Fix
Being written
Copy-paste fixes for 526 are in the enrichment queue
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Last verified 2026-10-12 · Source: Cloudflare 1xxx and 5xx error reference · Official docs ↗ · ~9,900 searches/mo