CVE-2026-120634
Published:November 03, 2026
Updated:November 04, 2026
CGI::Carp versions before 5.00 for Perl leak warnings across requests in persistent environments via the warningsToBrowser buffer.
Warnings are held in a package-level buffer until warningsToBrowser writes them into the page as HTML comments, and the buffer is never cleared between requests. Under mod_perl, FastCGI or PSGI, warnings from one request are written into a later one.
Warnings that contain one user's request data can appear in the HTML sent to another user.
Affected Packages
https://github.com/leejo/CGI.pm.git (GITHUB):
Affected version(s) =release-2-69 <v5.01 || =release_2-70 <v5.01 || >=release-2_73 <v5.01 || >=release-2_751 <v5.01 || >=release-1_80 <v5.01 || >=release-3_01 <v5.01 || =version-3_23 <v5.01 || >=v3.51 <v5.01 || >=v4.00 <v5.01 || =4.69 <v5.01Fix Suggestion:
Update to version v5.01Related Resources (7)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.3
Attack Vector
NETWORK
Attack Complexity
HIGH
Attack Requirements
NONE
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
LOW
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
NONE
Subsequent System Integrity
NONE
Subsequent System Availability
NONE
CVSS v3
Base Score:
3.7
Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
NONE
Weakness Type (CWE)
Exposure of Data Element to Wrong Session
EPSS
Base Score:
0.19