Form::Processor::Field::HtmlArea versions from 0.06 through 1.162360 for Perl allow attacker selected method dispatch and resource exhaustion via an HTML::Tidy diagnostic that validate passes to add_error as a Locale::Maketext template

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-13051
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-13 17:17:19 UTC
Updated2026-08-13 17:17:19 UTC
DescriptionForm::Processor::Field::HtmlArea versions from 0.06 through 1.162360 for Perl allow attacker selected method dispatch and resource exhaustion via an HTML::Tidy diagnostic that validate passes to add_error as a Locale::Maketext template. validate runs HTML::Tidy over the submitted markup and passes each resulting message to add_error as its first argument, which add_error hands to the language handle as the Locale::Maketext message key. The default handle's lexicon sets `_AUTO`, so a message that is not a lexicon entry is compiled as a bracket notation template instead of being looked up. Tidy diagnostics quote the offending attribute name or value, so a bracket group in the submitted markup reaches the template position, where the first token of the group names a method called on the language handle and the remaining tokens are its arguments. A group such as `[0]` makes the compile croak, and neither the field nor the handle catches it, so the exception leaves validate. `[sprintf,%2000000000d,7]` reaches CORE::sprintf with an attacker chosen field width. One submission of crafted markup to an HtmlArea field throws an unhandled exception out of form validation or allocates an arbitrary amount of memory, and an application whose language handle subclass defines side effecting public methods makes those callable with attacker chosen arguments. The other field types pass fixed templates with the submitted value in an argument slot, where it stays inert, and are unaffected.

Risk And Classification

Problem Types: CWE-470 | CWE-1336 | CWE-1336 CWE-1336 Improper Neutralization of Special Elements Used in a Template Engine | CWE-470 CWE-470 Use of Externally-Controlled Input to Select Classes or Code ('Unsafe Reflection')

References

ReferenceSourceLinkTags
metacpan.org/release/HANK/Form-Processor-1.162360/source/lib/Form/Processo... 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
security.metacpan.org/patches/F/Form-Processor/1.162360/CVE-2026-13051-r1.patch 9b29abf9-4ab0-4765-b253-1875cd9b441e security.metacpan.org
www.cve.org/CVERecord 9b29abf9-4ab0-4765-b253-1875cd9b441e www.cve.org
metacpan.org/release/HANK/Form-Processor-1.162360/source/lib/Form/Processo... 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Additional Advisory Data

Workarounds

CNA: No fixed release is available, and the distribution has not been updated since 2016. Apply the patch, which passes the tidy message as an interpolation argument so its brackets are displayed rather than compiled. Deployments that cannot patch should not use the HtmlArea field type.

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