CallBackery versions before 0.62.0 for Perl allow denial of service via the request path interpolated as a regular expression under CGI, FastCGI and PSGI.

The before_dispatch hook installed by startup() removes PATH_INFO from the end of the request URI with a substitution that interpolates PATH_INFO unquoted. Under CGI, FastCGI and PSGI both values come from the request, so the client chooses both the pattern and the string it is matched against.

A short unauthenticated request with a backreference in the path backtracks exponentially and can keep a worker process busy for minutes.
Advisories

No advisories yet.

Fixes

Solution

Upgrade to CallBackery 0.62.0 or later.


Workaround

No workaround given by the vendor.

History

Fri, 30 Oct 2026 13:15:00 +0000

Type Values Removed Values Added
Description CallBackery versions before 0.62.0 for Perl allow denial of service via the request path interpolated as a regular expression under CGI, FastCGI and PSGI. The before_dispatch hook installed by startup() removes PATH_INFO from the end of the request URI with a substitution that interpolates PATH_INFO unquoted. Under CGI, FastCGI and PSGI both values come from the request, so the client chooses both the pattern and the string it is matched against. A short unauthenticated request with a backreference in the path backtracks exponentially and can keep a worker process busy for minutes.
Title CallBackery versions before 0.62.0 for Perl allow denial of service via the request path interpolated as a regular expression under CGI, FastCGI and PSGI
Weaknesses CWE-1333
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: CPANSec

Published:

Updated: 2026-10-30T13:11:14.458Z

Reserved: 2026-10-29T10:58:47.286Z

Link: CVE-2026-118993

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-10-30T13:18:32.100

Modified: 2026-10-30T13:18:32.100

Link: CVE-2026-118993

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-30T14:30:08Z

Weaknesses