CVE-2025-15646 | HTML::Gumbo versions before 0.19 for Perl disclose heap memo… | CVSS 9.8 CRITICAL

Description

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.

Metadata

CVE ID: CVE-2025-15646
State: PUBLISHED
Assigner: CPANSec
Reserved: 2026-05-22 10:47 UTC
Published: 2026-07-01 14:38 UTC
Last updated: 2026-07-01 18:09 UTC
Primary CWE: CWE-843
CWE-843 Access of Resource Using Incompatible Type (Type Con…
Vendor / Product: BPS / HTML::Gumbo
Sources: cve.org · NVD

Severity & Metrics

9.8 CRITICAL CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
BPS	HTML::Gumbo	—	0 < 0.19

Weakness (CWE)

CWE	Source	Description
CWE-125	cna	CWE-125 Out-of-bounds Read
CWE-843	cna	CWE-843 Access of Resource Using Incompatible Type (Type Confusion)

CVSS scores (1)

Score	Severity	Version	Source	Vector
9.8	CRITICAL	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References (3)