CVE-2025-15646
Heap memory disclosure in HTML::Gumbo (<template>) due to type confusion during parse.
Is CVE-2025-15646 being exploited?
Not confirmed. CVE-2025-15646 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.67% probability of exploitation in the next 30 days.
How severe is CVE-2025-15646?
CVE-2025-15646 is rated Critical with a CVSS score of 9.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2025-15646?
Yes. A fix has been recorded for CVE-2025-15646. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2025-15646 affect?
CVE-2025-15646 affects HTML::Gumbo < 0.19 (Perl). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2025-15646?
Upgrade to HTML::Gumbo 0.19+
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Information disclosure via heap over-read when parsing <template> elements; formats 'string'/'tree' leak memory contents.
Patch when possible
- affected< 0.19
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.