CVE-2026-116127: Starlet versions before 0.33 for Perl send a body in responses to HEAD requests, corrupting the next
Affects starletSource GCVE Database
Not known to be exploited.
Data as of 5 Nov 2026, 12:35 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 30 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10starletpkg:deb/ubuntu/starlet?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.04 LTSstarletpkg:deb/ubuntu/starlet?arch=source&distro=resoluteOther threats | Affected
| Fixed in– |
Ubuntu 24.04 LTSstarletpkg:deb/ubuntu/starlet?arch=source&distro=nobleOther threats | Affected
| Fixed in– |
Ubuntu 22.04 LTSstarletpkg:deb/ubuntu/starlet?arch=source&distro=jammyOther threats | Affected
| Fixed in– |
Ubuntu 20.04 LTSstarletpkg:deb/ubuntu/starlet?arch=source&distro=focalOther threats | Affected
| Fixed in– |
Ubuntu 18.04 LTSstarletpkg:deb/ubuntu/starlet?arch=source&distro=bionicOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
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.
References
- ubuntu.com/security/CVE-2026-116127 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-116127 (opens in a new tab)
- lists.security.metacpan.org/cve-announce/msg/44760435/ (opens in a new tab)
- github.com/kazuho/Starlet/commit/859e0c9572cdbed4bb45706d3957b3c025dc0ede.patch (opens in a new tab)
- metacpan.org/release/KAZUHO/Starlet-0.33/changes (opens in a new tab)