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CVE-2025-15646

9.8 · CRITICAL

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

Published Jul 1, 2026CWE-125EPSS 0.67%

Overview

CVE-2025-15646 is a critical-severity vulnerability. It was published on July 1, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refbugs.debian.org/1104789GitHubgithub.com/bestpractical/HTML-Gumbo/commit/15c0598909d4a64f47ef0a1abc5051f4e113c186.patchRefmetacpan.org/release/BPS/HTML-Gumbo-0.19/changesRefwww.openwall.com/lists/oss-security/2026/07/01/7

How CyberStrike helps

Frequently asked questions

What is CVE-2025-15646?

CVE-2025-15646 is a critical-severity vulnerability. It was published on July 1, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-15646?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2025-15646?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2025-15646?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2025-15646 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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