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CVE-2026-9658— Plack::Middleware::Security::Common versions before 0.13.1 for Perl did not block header injections in request paths

Quick assessment

Affected
RRWO Plack::Middleware::Security::Common
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.

Plack::Middleware::Security::Common是RRWO个人开发者的一个Perl Web应用安全响应头中间件。 Plack::Middleware::Security::Common 0.13.1之前版本存在安全漏洞，该漏洞源于请求路径中的标头注入规则无效，除非标头注入被双重编码，例如GET /path HTTP/1.1 Host: secret.example.com，需要注意的是，不清楚反向代理是否会阻止带有CRLF后跟额外标头的请求路径，也不清楚基于Plack的服务器如何处理

AI Predicted 5.3 Difficulty: Moderate EPSS 0.34% · P25

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
RRWO Plack::Middleware::Security::Common < 0.13.1 affected
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I. Basic Information for CVE-2026-9658

Vulnerability Information
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Vulnerability Title
Plack::Middleware::Security::Common versions before 0.13.1 for Perl did not block header injections in request paths
Source: CVE Program / CVE List V5
Vulnerability Description
Plack::Middleware::Security::Common versions before 0.13.1 for Perl did not block header injections in request paths. The header injection rule was ineffective at blocking header injections in the request paths unless they were double-encoded, for example, GET /path\r\nHTTP/1.1\r\nHost: secret.example.com Note that it is unclear whether request paths with CRLF followed by additional headers would be blocked by reverse proxies, or how they would be processed by Plack-based servers.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
特殊元素过滤不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Plack::Middleware::Security::Common 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Plack::Middleware::Security::Common是RRWO个人开发者的一个Perl Web应用安全响应头中间件。 Plack::Middleware::Security::Common 0.13.1之前版本存在安全漏洞，该漏洞源于请求路径中的标头注入规则无效，除非标头注入被双重编码，例如GET /path HTTP/1.1 Host: secret.example.com，需要注意的是，不清楚反向代理是否会阻止带有CRLF后跟额外标头的请求路径，也不清楚基于Plack的服务器如何处理
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
RRWO Plack::Middleware::Security::Common 0 ~ 0.13.1 -

II. Public POCs for CVE-2026-9658

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III. Intelligence Information for CVE-2026-9658

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Other References for CVE-2026-9658 (1)

IV. Related Vulnerabilities

Same vendor: RRWO
Same weakness: CWE-790

V. Comments for CVE-2026-9658

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