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CVE-2026-9658

Published: May 28, 2026Updated: Jun 1, 2026 Sources: CVE List NVDCWE-113
NVD MITRE
7.3CVSSHIGH
EPSS Score
0.2%
Top 86.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:LI:LA:L
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:LAvailability
Low
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Weaknesses

CWE-113CWE-790

Affected Products

Plack::Middleware::Security::CommonRRWO
Library
OSS Libraries / generic-library
rrwoOSS Librariesaka net::cidr::set, crypt::saltedhash

Exploitability

Official Patch Available
Workaround Available

References

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

Timeline

Published
May 28, 2026
Last Updated
Jun 1, 2026

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