CVE-2026-120634

Unknown

Description

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.

SeverityUnknown

CVSS—

Exploit probability—

ProductCgi

PublishedNov 4, 2026

First seenNov 4, 2026

Weakness typeCWE-488CWE-488

How to fix

Update

CGI5.00 or later

Patches

github.com/leejo/CGI.pm/commit/604a83fec105f75fe06f1a75026c4c34fd5a1f61.patch

Vendor advisories

metacpan.org/release/LEEJO/CGI-5.00/changes

Affected products

Product	Affected versions	Fixed in
CGI	v < 5.00	5.00

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