CVE-2025-15646: Bps Html::gumbo

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

HTML::Gumbo versions before 0.19 for Perl disclose heap memory via type confusion. Support for the <template> element was added to libgumbo 0.10.0 in 2015, but the walk_tree function in lib/HTML/Gumbo.xs was not updated to support it. The element was treated as a text-node, where strlen() over-reads the heap block that the pointer addresses. Any caller that runs parse() with the default format => 'string', or with format => 'tree', on input containing a <template> element serializes the over-read bytes into the returned result, disclosing bounded heap contents. format => 'callback' reaches a croak on the unhandled node type and is unaffected.

Affected products

• Bps Html::gumbo: before 0.19 (fixed in 0.19)

Published 2026-07-01. Last modified 2026-10-06.