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CVE-2026-66746— Rouille 0.4.0 - 3.6.2 HTTP Response Splitting via Header Injection

Quick assessment

Affected
tomaka rouille
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 0.4.0版本至3.6.2版本存在输入验证错误漏洞，该漏洞源于HTTP响应拆分，攻击者可在输入中嵌入回车或换行字节注入任意响应头，利用百分号解码的查询参数或Cookie头值，可能导致缓存投毒、会话固定和安全头覆盖攻击。

CVSS 5.4 · Medium EPSS 0.34% · P26

Affected Version Matrix 1

VendorProduct Version RangeStatus
tomaka rouille 0.4.0≤ 3.6.2 affected
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I. Basic Information for CVE-2026-66746

Vulnerability Information
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Vulnerability Title
Rouille 0.4.0 - 3.6.2 HTTP Response Splitting via Header Injection
Source: CVE Program / CVE List V5
Vulnerability Description
Rouille 0.4.0 through 3.6.2 contains an HTTP response splitting vulnerability that allows remote attackers to inject arbitrary response headers by embedding carriage return (0x0D) or line feed (0x0A) bytes into attacker-controlled input. Attackers can exploit percent-decoded query parameters reflected into response headers or inject bare LF characters into Cookie header values that are interpolated directly into Set-Cookie response headers, enabling cache poisoning, session fixation, and security header override attacks such as bypassing CSP or CORS policies.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
HTTP头部中CRLF序列转义处理不恰当(HTTP响应分割)
Source: CVE Program / CVE List V5
Vulnerability Title
tomaka rouille 输入验证错误漏洞
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 0.4.0版本至3.6.2版本存在输入验证错误漏洞，该漏洞源于HTTP响应拆分，攻击者可在输入中嵌入回车或换行字节注入任意响应头，利用百分号解码的查询参数或Cookie头值，可能导致缓存投毒、会话固定和安全头覆盖攻击。
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 0.4.0 ~ 3.6.2 -

II. Public POCs for CVE-2026-66746

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III. Intelligence Information for CVE-2026-66746

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Vendor Advisories for CVE-2026-66746 (1)

Proof of Concept for CVE-2026-66746 (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-2026-66754 5.9 MEDIUM Rouille 0.1.6 - 3.6.2 Reachable Assertion DoS via remove_prefix percent-encoding
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-113

V. Comments for CVE-2026-66746

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