{"id":"CVE-2025-15646","title":"HTML::Gumbo versions before 0.19 for Perl disclose heap memory via type confusion.\n\nSupport 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","summary":"HTML::Gumbo versions before 0.19 for Perl disclose heap memory via type confusion.\n\nSupport 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. T…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-125","CWE-843"],"published":"2026-07-01","updated":"2026-09-30","sourceUpdated":"2026-09-30T21:10:00.190","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-15646","references":[{"url":"https://bugs.debian.org/1104789","label":"9b29abf9-4ab0-4765-b253-1875cd9b441e"},{"url":"https://github.com/bestpractical/HTML-Gumbo/commit/15c0598909d4a64f47ef0a1abc5051f4e113c186.patch","label":"9b29abf9-4ab0-4765-b253-1875cd9b441e"},{"url":"https://metacpan.org/release/BPS/HTML-Gumbo-0.19/changes","label":"9b29abf9-4ab0-4765-b253-1875cd9b441e"},{"url":"http://www.openwall.com/lists/oss-security/2026/07/01/7","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00671,"epssPercentile":0.50162,"ingestedAt":"2026-09-30T21:25:07.791Z","slug":"CVE-2025-15646","body":"## Overview\n\nHTML::Gumbo versions before 0.19 for Perl disclose heap memory via type confusion.\n\nSupport 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.\n\nAny 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}