TI-2026-08479 Aliases CVE-2026-9658 GHSA-xcq6-chp9-g954

HTTP response splitting in RRWO Plack::Middleware::Security::Common

LOW 37CWE-113Published 2026-05-28 · Updated 2026-06-01

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: —
Confidentiality · integrity · availability: Low · Low · Low
Fix status: Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00226 13th percentileScored 2026-11-07

Fix Fixed Plack::Middleware::Security::Common (RRWO): 0.13.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
RRWO	Plack::Middleware::Security::Common	before 0.13.1	0.13.1	Patch available	CNA

Plack::Middleware::Security::Common VendorRRWO Affected before 0.13.1 Fixed in 0.13.1 Patch available CNA

Remediation

Fix · CNA Plack::Middleware::Security::Common (RRWO) Fixed in 0.13.1

Timeline

2026-10-02 Threatist record created from CVE-2026-9658
2026-10-03 Alias added: GHSA-xcq6-chp9-g954

References

Other 1

https://metacpan.org/release/RRWO/Plack-Middleware-Security-Simple-v0.13.1/changes

TI-2026-13955 OS command injection in RRWO Catalyst::View::Wkhtmltopdf CVSS 3.1CRITICAL 9.8
TI-2026-14395 Server-side request forgery in RRWO Plack::App::Prerender CVSS 3.1CRITICAL 9.1
TI-2026-34943 Crypt::SaltedHash versions through 0.09 for Perl generate insecure random values for salts CVSS 3.1CRITICAL 9.1
TI-2026-34345 Net::Statsd::Tiny versions before 0.3.8 for Perl allowed metric injections CVSS 3.1HIGH 8.2
TI-2026-15909 Net::CIDR::Set versions before 0.23 for Perl allow memory exhaustion and malformed set… CVSS 3.1HIGH 7.5
TI-2026-36790 Uncontrolled recursion in RRWO Net::CIDR::Set CVSS 3.1HIGH 7.5

See all 19 →

Sources

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