CPANSA-Plack-2026-115825: Plack vulnerability
| Publisher | giterlizzi | Document category | csaf_security_advisory |
|---|---|---|---|
| Initial release date | 2026-10-25T00:00:00 | Engine | CSAF Perl Toolkit 0.26 |
| Current release date | 2026-10-25T00:00:00 | Build Date | |
| Current version | 1 | Status | final |
| CVSS v3.1 Base Score | 7.5 | Severity | |
| Original language | Language | en | |
| Also referred to | |||
Vulnerability Description
HTTP::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.
Vulnerabilities
CVE-2026-115825
Vulnerability 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.
| Weakness | CWE-789 : Memory Allocation with Excessive Size Value |
|---|
Product status
Known affected
| Product | Score | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Plack less than 1.0056 |
|
Fixed
- Plack greater than or equal 1.0056
giterlizzi
Namespace: https://github.com/giterlizzi/
gdt@cpan.org
References
- CPANSA-Plack-2026-115825 JSON self
https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-plack-2026-115825.json - https://github.com/plack/Plack/commit/11545871cadc5df1b744cebb429cfeb4ebc1069a.patch external
https://github.com/plack/Plack/commit/11545871cadc5df1b744cebb429cfeb4ebc1069a.patch - https://metacpan.org/release/MIYAGAWA/Plack-1.0056/changes external
https://metacpan.org/release/MIYAGAWA/Plack-1.0056/changes - http://www.openwall.com/lists/oss-security/2026/10/26/10 external
http://www.openwall.com/lists/oss-security/2026/10/26/10 - CVE-2026-115825 (NVD) external
https://nvd.nist.gov/vuln/detail/CVE-2026-115825
Revision history
| Version | Date of the revision | Summary of the revision |
|---|---|---|
| 1 | Sun Oct 25 00:00:00 2026 | First release |
Sharing rules
TLP:WHITE
For the TLP version see: https://www.first.org/tlp/