CVE-2026-9658
May 29, 2026, 3:29 p.m.
None
No Score
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.
Product(s) Impacted
| Vendor | Product | Versions |
|---|---|---|
| Plack |
|
|
Weaknesses
Common security weaknesses mapped to this vulnerability.
CWE-113
Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')
The product receives data from an HTTP agent/component (e.g., web server, proxy, browser, etc.), but it does not neutralize or incorrectly neutralizes CR and LF characters before the data is included in outgoing HTTP headers.
*CPE(s)
Affected systems and software identified for this CVE.
| Type | Vendor | Product | Version | Update | Edition | Language | Software Edition | Target Software | Target Hardware | Other Information |
|---|---|---|---|---|---|---|---|---|---|---|
| a | plack | middleware_security_common | <0.13.1 | / | / | / | / | / | / | / |
Tags
Timeline
Published: May 28, 2026, 1:16 p.m.
Last Modified: May 29, 2026, 3:29 p.m.
Last Modified: May 29, 2026, 3:29 p.m.
Status : Deferred
CVE has been recently published to the CVE List and has been received by the NVD.
More infoSource
9b29abf9-4ab0-4765-b253-1875cd9b441e
*Disclaimer: Some vulnerabilities do not have an associated CPE. To enhance the data, we use AI to infer CPEs based on CVE details. This is an automated process and might not always be accurate.