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CVE-2026-9658

7.3 · HIGH

Plack::Middleware::Security::Common versions before 0.13.1 for Perl did not block header injections in request paths.

Published May 28, 2026CWE-113EPSS 0.34%

Overview

CVE-2026-9658 is a high-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refmetacpan.org/release/RRWO/Plack-Middleware-Security-Simple-v0.13.1/changesRefwww.openwall.com/lists/oss-security/2026/05/28/9

How CyberStrike helps

Frequently asked questions

What is CVE-2026-9658?

CVE-2026-9658 is a high-severity vulnerability. It was published on May 28, 2026 and has a CVSS 3.1 base score of 7.3 (HIGH).

How severe is CVE-2026-9658?

This vulnerability has a CVSS 3.1 base score of 7.3, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-9658?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-9658?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-9658 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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