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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: libhtml-formfu-perl: CVE-2026-19873
Message-ID: <178817274203.424220.12746453926680960834.reportbug@elende.valinor.li>
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Date: Mon, 31 Aug 2026 12:39:02 +0200
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Source: libhtml-formfu-perl
Version: 2.07000-2
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>
Control: found -1 2.07000-1

Hi,

The following vulnerability was published for libhtml-formfu-perl.

CVE-2026-19873[0]:
| HTML::FormFu versions through 2.08 for Perl allow resource
| exhaustion via an unbounded repeat count from the query string in
| Repeatable elements.  When a Repeatable element has counter_name
| set, its process method reads the repeat count from the named query
| string parameter, checks only that it is a positive integer, and
| passes it to repeat, which deep-clones the element's child subtree
| once per iteration. Nothing caps the value, and no attribute lets an
| application impose a limit.  The count is read on every request,
| before the form decides whether it was submitted, so a plain GET
| reaches the clone loop with no credentials, no session and no
| request body. Nesting multiplies: a Repeatable inside a Repeatable
| takes a counter at each level, so an outer and an inner value of 100
| build 10,000 clones.  Once the form is submitted, each cloned
| field's constraints scan the whole element tree in
| _find_field_value, so cost grows faster than linearly with the
| count. A single request exhausts memory and CPU.  The latest release
| on CPAN is 2.07, from 2018. Version 2.08 exists only in the git
| repository.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-19873
    https://www.cve.org/CVERecord?id=CVE-2026-19873
[1] https://lists.security.metacpan.org/cve-announce/msg/43141785/

Regards,
Salvatore
]