CVE-2026-118993 Details
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.
A denial-of-service vulnerability has been identified in CallBackery versions prior to 0.62.0 for Perl. The issue arises from the request path being processed as a regular expression under CGI, FastCGI, and PSGI. The vulnerability is triggered by the before_dispatch hook, which removes PATH_INFO from the request URI using an unquoted interpolation. This allows clients to manipulate both the pattern and the string it is matched against. A brief unauthenticated request containing a backreference in the path can cause exponential backtracking, potentially keeping a worker process occupied for several minutes.
Users are advised to update CallBackery to version 0.62.0 or later, where this vulnerability has been addressed.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 30, 2026CISA-ADP
Assessed Nov 6, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://metacpan.org/release/OETIKER/CallBackery-0.62.0/changes | CPANSec | Release NotesVendor |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-1333 | Inefficient Regular Expression Complexity | CPANSec |
Affected Products
| Product | Versions |
|---|---|
| CallBackery | < 0.62.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Nov 6, 2026 | CVE Modified | CISA-ADP |
| Oct 30, 2026 | New CVE Received | CPANSec |