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Starman versions before 0.4019 for Perl (4 CVEs)
From: Robert Rothenberg <rrwo () cpansec org>
Date: Sun, 25 Oct 2026 16:57:23 +0000
CVE-2026-115817 Starman versions before 0.4019 for Perl allow a stalled request body to hold a worker indefinitely, as read_timeout covers only the headers CVE-2026-115822 Starman versions before 0.4019 for Perl allow CPU exhaustion via quadratic regex backtracking when parsing chunked request bodies CVE-2026-115823 Starman versions before 0.4019 for Perl send response bodies for HEAD requests, desynchronizing responses on keep-alive connections CVE-2026-115824 Starman versions before 0.4019 for Perl allow memory exhaustion via unbounded buffering of chunked request bodies ======================================================================== CVE-2026-115817 CPAN Security Group ======================================================================== CVE ID: CVE-2026-115817 Distribution: Starman Versions: before 0.4019 MetaCPAN: https://metacpan.org/dist/Starman VCS Repo: https://github.com/miyagawa/Starman Starman versions before 0.4019 for Perl allow a stalled request body to hold a worker indefinitely, as read_timeout covers only the headers Description ----------- Starman versions before 0.4019 for Perl allow a stalled request body to hold a worker indefinitely, as read_timeout covers only the headers. Content-Length and chunked request bodies are read with blocking reads and no deadline. A client that sends complete headers and then stalls or trickles the body keeps the worker waiting until it disconnects. A remote attacker can take every worker with a few such connections, five with the default worker count, so the server stops answering requests. Version 0.4019 applies read_timeout to each wait for body data and adds a body_timeout limit, 300 seconds by default, on the total time to read a body. Problem types ------------- - CWE-770 Allocation of Resources Without Limits or Throttling Solutions --------- Upgrade to Starman 0.4019 or later. References ---------- https://github.com/miyagawa/Starman/commit/89dffd3bdc9baa1cbe1b48a43615586ba2588558.patch https://github.com/miyagawa/Starman/commit/a30533c03051502d6b67cd48b3a95a61e129691b.patch https://metacpan.org/release/MIYAGAWA/Starman-0.4019/changes ======================================================================== CVE-2026-115822 CPAN Security Group ======================================================================== CVE ID: CVE-2026-115822 Distribution: Starman Versions: before 0.4019 MetaCPAN: https://metacpan.org/dist/Starman VCS Repo: https://github.com/miyagawa/Starman Starman versions before 0.4019 for Perl allow CPU exhaustion via quadratic regex backtracking when parsing chunked request bodies Description ----------- Starman versions before 0.4019 for Perl allow CPU exhaustion via quadratic regex backtracking when parsing chunked request bodies. Starman decodes chunked request bodies before calling the application, matching each chunk-size line with `s/^(([0-9a-fA-F]+).*\015\012)//`. A line of hex digits followed by a bare LF and then CRLF never matches, because `.` does not match LF, and each failed attempt backtracks in time quadratic in the length of the hex run. Nothing limits the length of the line. A remote attacker can exhaust worker CPU by sending such requests to any route. Problem types ------------- - CWE-1333 Inefficient Regular Expression Complexity Solutions --------- Upgrade to Starman 0.4019 or later. References ---------- https://github.com/miyagawa/Starman/commit/0f33f9b132b5e410d6cce722ff71988e22476acf.patch https://metacpan.org/release/MIYAGAWA/Starman-0.4019/changes ======================================================================== CVE-2026-115823 CPAN Security Group ======================================================================== CVE ID: CVE-2026-115823 Distribution: Starman Versions: before 0.4019 MetaCPAN: https://metacpan.org/dist/Starman VCS Repo: https://github.com/miyagawa/Starman Starman versions before 0.4019 for Perl send response bodies for HEAD requests, desynchronizing responses on keep-alive connections Description ----------- Starman versions before 0.4019 for Perl send response bodies for HEAD requests, desynchronizing responses on keep-alive connections. For a HEAD request Starman omits chunked framing but still writes the body returned by the application, on both the array and streaming response paths. Responses with a 1xx, 204 or 304 status also carry the body. On a keep-alive or pipelined connection the client reads those bytes as the start of the next response. A front-end proxy that reuses upstream connections may then pair responses with the wrong requests. Problem types ------------- - CWE-444 Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') Workarounds ----------- For deployments that cannot upgrade to 0.4019, enable Plack::Middleware::Head, which removes the body from HEAD responses. Solutions --------- Upgrade to Starman 0.4019 or later. References ---------- https://github.com/miyagawa/Starman/commit/91c47c529cd1e100f938486896ea9083ec3ec7bf.patch https://metacpan.org/release/MIYAGAWA/Starman-0.4019/changes ======================================================================== CVE-2026-115824 CPAN Security Group ======================================================================== CVE ID: CVE-2026-115824 Distribution: Starman Versions: before 0.4019 MetaCPAN: https://metacpan.org/dist/Starman VCS Repo: https://github.com/miyagawa/Starman Starman versions before 0.4019 for Perl allow memory exhaustion via unbounded buffering of chunked request bodies Description ----------- Starman versions before 0.4019 for Perl allow memory exhaustion via unbounded buffering of chunked request bodies. The chunked body decoder keeps each chunk in memory until the whole chunk and its CRLF have arrived, and sets no limit on the length of a chunk-size line. A client that declares a huge chunk size and streams data, or sends a chunk-size line that never ends, grows the buffer for as long as it keeps sending. A remote attacker can exhaust worker memory with a single connection. Problem types ------------- - CWE-770 Allocation of Resources Without Limits or Throttling Solutions --------- Upgrade to Starman 0.4019 or later. References ---------- https://github.com/miyagawa/Starman/commit/d789a02dbe5408ef5f7a4659078d0008dd84c308.patch https://github.com/miyagawa/Starman/commit/0f33f9b132b5e410d6cce722ff71988e22476acf.patch https://metacpan.org/release/MIYAGAWA/Starman-0.4019/changes
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- Starman versions before 0.4019 for Perl (4 CVEs) Robert Rothenberg (Oct 25)