Virtual Patching: Block Zero-Days With WAF Custom Rules Before You Can Upgrade
A new CVE lands and you cannot patch every host today. Virtual patching with WAF custom rules buys safe time. Here is how to write one that holds.
6 min readWAFIO BLOG
Security notes from the WAFio team
Threat advisories, practical how-tos and engineering deep-dives on web application firewalls, semantic detection, malicious uploads, eBPF and runtime security.
PHP2Shell (CVE-2026-109618 & CVE-2026-109619): Shielding PHP Apps While You Patch
Two critical PHP core RCE flaws (PHP2Shell) hit every default install since PHP 5.4. Here is what they do and how to virtual-patch with a WAF before you upgrade.
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Semantic WAF vs Regex Signatures: Why Pattern-Only Detection Misses Modern Attacks
Regex signatures match strings; semantic analysis understands structure. Here is why signature-only WAFs both over-block and under-detect, and what to do instead.
6 min read
Stopping Malicious File Uploads: SHA-256 Verification at the Edge
Upload forms are a favourite malware delivery path. Learn how hash-based verification screens files on the WAF agent before your application ever receives them.
5 min read
An eBPF Firewall for Linux Hosts: XDP and TC Enforcement Explained
eBPF moves packet filtering into the Linux kernel at XDP and TC. Here is what that means for host firewalling, enforcement and visibility — and its real limits.
6 min read
Tuning OWASP CRS: Cutting False Positives Without Losing Coverage
OWASP CRS is powerful but noisy out of the box. A practical, ordered method to reduce false positives while keeping real attacks blocked.
6 min read