HTTP::Server::PSGI versions before 1.0056 for Perl allow a single request to crash the server by declaring a large Content-Length

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-115825
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-25 17:17:01 UTC
Updated2026-10-26 02:17:06 UTC
DescriptionHTTP::Server::PSGI versions before 1.0056 for Perl allow a single request to crash the server by declaring a large Content-Length. The request body is read with sysread() calls sized by the remaining Content-Length. Perl grows the read buffer to the requested length before any data arrives, so the server tries to allocate as much memory as the client declares. A remote attacker can send one request with a large Content-Length and a few body bytes, and perl exits with an out-of-memory error before the application is called. HTTP::Server::PSGI runs as a single process, so the server stays down until restarted.

Risk And Classification

Problem Types: CWE-789 | CWE-789 CWE-789 Memory Allocation with Excessive Size Value

References

ReferenceSourceLinkTags
www.openwall.com/lists/oss-security/2026/10/26/10 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
metacpan.org/release/MIYAGAWA/Plack-1.0056/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
github.com/plack/Plack/commit/11545871cadc5df1b744cebb429cfeb4ebc1069a.p... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Solutions

CNA: Upgrade to Plack 1.0057 or later.

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