CPANSA-Net-OAuth-2026-72888: Net-OAuth vulnerability

Publisher giterlizzi Document category csaf_security_advisory
Initial release date 2026-08-16T00:00:00 Engine CSAF Perl Toolkit 0.26
Current release date 2026-08-16T00:00:00 Build Date
Current version 1 Status final
CVSS v3.1 Base Score 6.5 Severity Medium
Original language Language en
Also referred to

Vulnerability Description

Net::OAuth versions before 0.32 for Perl allow memory exhaustion via unbounded caching of failed module loads in smart_require.

smart_require stores results in a process-global hash with no bound and no eviction, and keeps an entry for every class name it is asked about, including names that failed to load, because the return value of the failed eval is stored before the error is checked. The key comes off the wire on the server side: _signature_method_class builds the class name from the signature_method parameter of the incoming message, and verify resolves it before any signature is checked.

A remote client chooses both how many entries are created and how long each key is. In a persistent server the hash grows for the life of the worker process until it exhausts memory. Header size limits bound the key length on the Authorization header path, but not on a POST body.

Vulnerabilities

CVE-2026-72888

Vulnerability Description

Net::OAuth versions before 0.32 for Perl allow memory exhaustion via unbounded caching of failed module loads in smart_require.

smart_require stores results in a process-global hash with no bound and no eviction, and keeps an entry for every class name it is asked about, including names that failed to load, because the return value of the failed eval is stored before the error is checked. The key comes off the wire on the server side: _signature_method_class builds the class name from the signature_method parameter of the incoming message, and verify resolves it before any signature is checked.

A remote client chooses both how many entries are created and how long each key is. In a persistent server the hash grows for the life of the worker process until it exhausts memory. Header size limits bound the key length on the Authorization header path, but not on a POST body.

Weakness CWE-770 : Allocation of Resources Without Limits or Throttling

Product status

Known affected
Product Score
Net-OAuth less than 0.32
CVSS Version CVSS Vector CVSS Base Score CVSS Base Severity
3.1 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H 6.5 Medium
Fixed

giterlizzi

Namespace: https://github.com/giterlizzi/

gdt@cpan.org

References

Revision history

Version Date of the revision Summary of the revision
1 Sun Aug 16 00:00:00 2026 First release

Sharing rules

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