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CVE-2025-15646 is an information disclosure vulnerability in HTML::Gumbo for Perl affecting versions before 0.19. The flaw is in the walk_tree function in lib/HTML/Gumbo.xs. After libgumbo added support for the HTML <template> element via the GUMBO_NODE_TEMPLATE node type, HTML::Gumbo's walk_tree logic was not updated accordingly. As a result, a <template> node can be treated as a text node, causing type confusion and leading strlen() to read past the intended bounds of the referenced heap buffer. When parse() is invoked on attacker-controlled HTML containing a <template> element, and the caller uses the default format => 'string' or format => 'tree', the over-read bytes can be serialized into the returned result, disclosing bounded heap memory contents. The format => 'callback' mode is described as unaffected because it croaks on the unhandled node type instead of serializing data.
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No public exploit code observed for this vulnerability.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
An information disclosure / memory-safety issue in libhtml-gumbo-perl caused by incorrect handling of the GUMBO_NODE_TEMPLATE node type, leading to use of uninitialized data and erratic output when parsing HTML containing <template>.
A heap memory disclosure vulnerability in HTML::Gumbo before version 0.19 for Perl caused by type confusion and an out-of-bounds read when parsing input containing a <template> element.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.