CPANSA-Starlet-2026-116127: Starlet vulnerability
| Publisher | giterlizzi | Document category | csaf_security_advisory |
|---|---|---|---|
| Initial release date | 2026-10-30T00:00:00 | Engine | CSAF Perl Toolkit 0.26 |
| Current release date | 2026-10-30T00:00:00 | Build Date | |
| Current version | 1 | Status | final |
| CVSS v3.1 Base Score | Severity | ||
| Original language | Language | en | |
| Also referred to | |||
Vulnerability Description
Starlet versions before 0.33 for Perl send a body in responses to HEAD requests, corrupting the next response on a persistent or pipelined connection.
The request method is not passed to the response writer, so whatever body the application returns for a HEAD request is sent. With Plack::Middleware::Head the body is empty, but an HTTP/1.1 response without a Content-Length header still gets the chunked encoding terminator. Responses with status 204 or 304 are also sent with their body.
Pipelined GET and HEAD requests keep the connection open even when keep-alive is disabled, which is the default. A client or proxy reading the connection takes the extra bytes as the start of the next response, which may desynchronize a proxy that shares the connection across clients.
Vulnerabilities
CVE-2026-116127
Vulnerability DescriptionStarlet versions before 0.33 for Perl send a body in responses to HEAD requests, corrupting the next response on a persistent or pipelined connection.
The request method is not passed to the response writer, so whatever body the application returns for a HEAD request is sent. With Plack::Middleware::Head the body is empty, but an HTTP/1.1 response without a Content-Length header still gets the chunked encoding terminator. Responses with status 204 or 304 are also sent with their body.
Pipelined GET and HEAD requests keep the connection open even when keep-alive is disabled, which is the default. A client or proxy reading the connection takes the extra bytes as the start of the next response, which may desynchronize a proxy that shares the connection across clients.
| Weakness | CWE-444 : Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') |
|---|
Product status
Known affected
| Product | Score | ||||
|---|---|---|---|---|---|
| Starlet less than 0.33 |
|
Fixed
- Starlet greater than or equal 0.33
giterlizzi
Namespace: https://github.com/giterlizzi/
gdt@cpan.org
References
- CPANSA-Starlet-2026-116127 JSON self
https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-starlet-2026-116127.json - https://github.com/kazuho/Starlet/commit/859e0c9572cdbed4bb45706d3957b3c025dc0ede.patch external
https://github.com/kazuho/Starlet/commit/859e0c9572cdbed4bb45706d3957b3c025dc0ede.patch - https://metacpan.org/release/KAZUHO/Starlet-0.33/changes external
https://metacpan.org/release/KAZUHO/Starlet-0.33/changes - CVE-2026-116127 (NVD) external
https://nvd.nist.gov/vuln/detail/CVE-2026-116127
Revision history
| Version | Date of the revision | Summary of the revision |
|---|---|---|
| 1 | Fri Oct 30 00:00:00 2026 | First release |
Sharing rules
TLP:WHITE
For the TLP version see: https://www.first.org/tlp/