RC: Add CVE to Redis Cloud changelog

Author: cmilesb

content/operate/rc/changelog/october-2025.md

@@ -0,0 +1,19 @@
+---
+Title: Redis Cloud changelog (August 2025)
+alwaysopen: false
+categories:
+- docs
+- operate
+- rc
+description: New features, enhancements, and other changes added to Redis Cloud during
+  August 2025.
+highlights: Security fixes
+linktitle: August 2025
+weight: 65
+tags:
+- changelog
+---
+
+## Security fixes
+
+Redis Cloud has already been updated with a patch for CVE-2025-49844. No further action is required at this time. For more information, see the [Redis blog post](https://redis.io/blog/security-advisory-cve-2025-49844/) about this vulnerability.