Microsoft publishes Azure WAF guidance for Brotli CVE-2026-111497
🔐 Microsoft has published Azure Web Application Firewall (WAF) guidance for CVE-2026-111497, a buffer-overflow vulnerability involving the Brotli decoder.
The advisory identifies affected Brotli versions 1.0.3 through 1.2.0 and discusses WAF controls for organizations publishing affected applications through Azure network services.
The guidance covers built-in WAF protection and a custom-rule approach.
Azure infrastructure and security partners should consult the original Microsoft advisory, assess whether customer workloads use the affected decoder, and follow the applicable software security updates.
WAF mitigations should not be confused with patching affected software.
Partner briefing
- What it is
Azure WAF guidance for Brotli vulnerability CVE-2026-111497, published October 23, 2026.
- What’s changing
Microsoft describes WAF protections and custom-rule options for exposed applications.
- Why it matters
Helps Azure security teams review defenses while managing the underlying software vulnerability.
- Who it affects
Azure security, networking and managed-services partners responsible for web workloads.