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CVE-2026-66754— Rouille 0.1.6 - 3.6.2 Reachable Assertion DoS via remove_prefix percent-encoding

Quick assessment

Affected
tomaka rouille
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

tomaka rouille是tomaka个人开发者的一个Rust的Web开发框架。 tomaka rouille 0.1.6版本至3.6.2版本存在异常处理不当漏洞，该漏洞源于Request::remove_prefix函数存在可达断言漏洞，允许远程未认证攻击者通过发送特制的百分号编码URL使服务器崩溃。

CVSS 5.9 · Medium EPSS 0.56% · P44

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
tomaka rouille 0.1.6≤ 3.6.2 affected
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I. Basic Information for CVE-2026-66754

Vulnerability Information
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Vulnerability Title
Rouille 0.1.6 - 3.6.2 Reachable Assertion DoS via remove_prefix percent-encoding
Source: CVE Program / CVE List V5
Vulnerability Description
Rouille 0.1.6 through 3.6.2 contains a reachable assertion vulnerability in the Request::remove_prefix function that allows remote unauthenticated attackers to crash the server by sending a crafted percent-encoded URL. Attackers can send a request whose decoded path matches a configured prefix while the raw percent-encoded path does not, causing the assert! to fail and triggering either a 500 error or full process termination depending on the panic configuration.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5
Vulnerability Title
tomaka rouille 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
tomaka rouille是tomaka个人开发者的一个Rust的Web开发框架。 tomaka rouille 0.1.6版本至3.6.2版本存在异常处理不当漏洞，该漏洞源于Request::remove_prefix函数存在可达断言漏洞，允许远程未认证攻击者通过发送特制的百分号编码URL使服务器崩溃。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
tomaka rouille 0.1.6 ~ 3.6.2 -

II. Public POCs for CVE-2026-66754

# POC Description Source Link Shenlong Link
AI-Generated POC Verified env Premium
Reproduced successfully in a real sandbox · Below is the actual recording of building the environment and exploiting the vulnerability.
Reproduction recording is a Pro+ exclusive
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claude_code · 6138 chars
GitHub 复现环境（可 clone 直接跑）
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-66754

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Vendor Advisories for CVE-2026-66754 (1)

Proof of Concept for CVE-2026-66754 (1)

Same Patch Batch · tomaka · 2026-07-28 · 4 CVEs total

CVE-2026-67182 7.5 HIGH Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Header Injection
CVE-2026-66746 5.4 MEDIUM Rouille 0.4.0 - 3.6.2 HTTP Response Splitting via Header Injection
CVE-2026-67181 5.4 MEDIUM Rouille 0.3.3 - 3.6.2 HTTP Request Smuggling via proxy Transfer-Encoding Header

IV. Related Vulnerabilities

Same product: rouille
Same vendor: tomaka
Same weakness: CWE-617

V. Comments for CVE-2026-66754

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