CVE-2026-116127 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
- Published
- Updated
- Exploit status
- No public exploit known
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.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| cpan Starlet | < 0.33 | 0.33 |
| debian/starlet(Debian:12) | All versions | No fix listed |
| debian/starlet(Debian:12) | = 0.31-2 | No fix listed |
| debian/starlet(Debian:12) | = 0.31-3 | No fix listed |
| debian/starlet(Debian:12) | = 0.32-1 | No fix listed |
| debian/starlet(Debian:12) | = 0.33-1 | No fix listed |
| debian/starlet(Debian:13) | All versions | No fix listed |
| debian/starlet(Debian:13) | = 0.31-2 | No fix listed |
| debian/starlet(Debian:13) | = 0.31-2+deb13u1 | No fix listed |
| debian/starlet(Debian:13) | = 0.31-3 | No fix listed |
| debian/starlet(Debian:13) | = 0.32-1 | No fix listed |
| debian/starlet(Debian:13) | = 0.33-1 | No fix listed |
| debian/starlet(Debian:14) | < 0.33-1 | 0.33-1 |
| debian/starlet(Debian:14) | = 0.31-2 | No fix listed |
| debian/starlet(Debian:14) | = 0.31-3 | No fix listed |
| debian/starlet(Debian:14) | = 0.32-1 | No fix listed |
| ubuntu/starlet(Ubuntu:22.04) | All versions | No fix listed |
| ubuntu/starlet(Ubuntu:24.04) | All versions | No fix listed |
| ubuntu/starlet(Ubuntu:26.04) | All versions | No fix listed |
| ubuntu/starlet(Ubuntu:26.10) | All versions | No fix listed |
References
- github.com patch
- metacpan.org release-notes
- Debian Security Tracker CVE-2026-116127 vendor-advisory
- Ubuntu CVE tracker vendor-advisory
- www.cve.org
- bugs.debian.org issue-tracking