---
description: Cloudflare WAF managed rulesets 2025-10-13 release
title: WAF Release - 2025-10-13
image: https://developers.cloudflare.com/changelog/post/2025-10-13-waf-release/og.png?v=4577ddd265adf90c
---

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October 13, 2025

## WAF Release - 2025-10-13

[WAF](https://developers.cloudflare.com/waf/)

Copy as Markdown| [View as Markdown](https://developers.cloudflare.com/changelog/post/2025-10-13-waf-release/index.md)| [Agent setup](https://developers.cloudflare.com/agent-setup/)

This week’s highlights include a new JinJava rule targeting a sandbox-bypass flaw that could allow malicious template input to escape execution controls. The rule improves detection for unsafe template rendering paths.

**Key Findings**

New WAF rule deployed for JinJava (CVE-2025-59340) to block a sandbox bypass in the template engine that permits attacker-controlled type construction and arbitrary class instantiation; in vulnerable environments this can escalate to remote code execution and full server compromise.

**Impact**

- CVE-2025-59340 — Exploitation enables attacker-supplied type descriptors / Jackson `ObjectMapper` abuse, allowing arbitrary class loading, file/URL access (LFI/SSRF primitives) and, with suitable gadget chains, potential remote code execution and system compromise.

| Ruleset | Rule ID | Legacy Rule ID | Description | Previous Action | New Action | Comments |
| --- | --- | --- | --- | --- | --- | --- |
| Cloudflare Managed Ruleset | ...c04bab5f | 100892 | JinJava - SSTI - CVE:CVE-2025-59340 | Log | Block | This is a New Detection |

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