HTML::Gumbo versions before 0.19 for Perl disclose heap memory via type confusion

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Summary

CVECVE-2025-15646
StatePUBLISHED
AssignerCPANSec
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-01 16:16:29 UTC
Updated2026-07-01 18:16:25 UTC
DescriptionHTML::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.

Risk And Classification

Problem Types: CWE-125 | CWE-843 | CWE-843 CWE-843 Access of Resource Using Incompatible Type (Type Confusion) | CWE-125 CWE-125 Out-of-bounds Read

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA BPS HTMLGumbo affected 0.19 custom Not specified

References

ReferenceSourceLinkTags
bugs.debian.org/1104789 9b29abf9-4ab0-4765-b253-1875cd9b441e bugs.debian.org
metacpan.org/release/BPS/HTML-Gumbo-0.19/changes 9b29abf9-4ab0-4765-b253-1875cd9b441e metacpan.org
www.openwall.com/lists/oss-security/2026/07/01/7 af854a3a-2127-422b-91ae-364da2661108 www.openwall.com
github.com/bestpractical/HTML-Gumbo/commit/15c0598909d4a64f47ef0a1abc505... 9b29abf9-4ab0-4765-b253-1875cd9b441e github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Vincent Lefevre (en)

CNA: Niko Tyni (en)

Additional Advisory Data

SourceTimeEvent
CNA2015-04-30T00:00:00.000ZGumbo 0.10.0 released with support for the <template> element.
CNA2025-05-06T00:00:00.000ZReported to the Debian bug tracker (#1104789).
CNA2025-05-17T00:00:00.000ZFix committed upstream.
CNA2026-05-21T00:00:00.000ZVersion 0.19 released with fix.

Solutions

CNA: Upgrade to HTML-Gumbo 0.19 or later, which adds GUMBO_NODE_TEMPLATE to the container node types handled by walk_tree.

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