# CVE-2026-9658

## Summary

- **CVE ID:** CVE-2026-9658
- **Severity:** HIGH
- **CVSS Score:** 7.3 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L)
- **CWE:** CWE-790, CWE-113
- **Published:** May 28, 2026
- **Last Modified:** Jun 1, 2026

## 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.

## Affected Products

- RRWO — Plack::Middleware::Security::Common (0)

## References

- [CNA](https://metacpan.org/release/RRWO/Plack-Middleware-Security-Simple-v0.13.1/changes)
- [CVE](http://www.openwall.com/lists/oss-security/2026/05/28/9)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.23%
- **EPSS Percentile:** 13.3

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._