CVE-2025-15646

CRITICALPre-NVD 9.89.8—
EchelonGraph scoreHIGH confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2026-07-01. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
9.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 1%CVSS: 9.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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

Support for the 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 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.

CVSS v3
9.8
EG Score
9.8(high)
EPSS
47.2%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 2, 2026

Advisory Details (4)

Auto-updated Jul 3, 2026
Patch available.
generic

oss-security - CVE-2025-15646: HTML::Gumbo versions before 0.19 for Perl disclose heap memory via type confusion

http://www.openwall.com/lists/oss-security/2026/07/01/7
generic

Client Challenge

https://metacpan.org/release/BPS/HTML-Gumbo-0.19/changes
generic
https://github.com/bestpractical/HTML-Gumbo/commit/15c0598909d4a64f47ef0a1abc5051f4e113c186.patch
generic Patch Available

#1104789 - libhtml-gumbo-perl: erratic behavior on the unsupported template HTML element - GUMBO_NODE_TEMPLATE node type (CVE-2025-15646) - Debian Bug report logs

https://bugs.debian.org/1104789

Vendor Advisories for CVE-2025-15646(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 40× in last 7d / 40× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-07-07 00:37 UTCEG score recompute
  2. 2026-07-07 00:37 UTCGHSA enrichment
  3. 2026-07-06 20:46 UTCEG score recompute
  4. 2026-07-06 20:45 UTCGHSA enrichment
  5. 2026-07-06 16:50 UTCEG score recompute
  6. 2026-07-06 16:49 UTCGHSA enrichment
  7. 2026-07-06 16:26 UTCEPSS rescore
  8. 2026-07-06 12:55 UTCEG score recompute
  9. 2026-07-06 12:54 UTCGHSA enrichment
  10. 2026-07-06 09:00 UTCEG score recompute
  11. 2026-07-06 09:00 UTCGHSA enrichment
  12. 2026-07-06 05:06 UTCEG score recompute
  13. 2026-07-06 05:06 UTCGHSA enrichment
  14. 2026-07-06 02:22 UTCEPSS rescore
  15. 2026-07-06 02:22 UTCEPSS rescore
  16. 2026-07-06 01:15 UTCEG score recompute
  17. 2026-07-06 01:15 UTCGHSA enrichment
  18. 2026-07-05 21:23 UTCEG score recompute
  19. 2026-07-05 21:23 UTCGHSA enrichment
  20. 2026-07-05 17:31 UTCEG score recompute
  21. 2026-07-05 17:31 UTCGHSA enrichment
  22. 2026-07-05 13:40 UTCEG score recompute
  23. 2026-07-05 13:40 UTCGHSA enrichment
  24. 2026-07-05 09:49 UTCEG score recompute
  25. 2026-07-05 09:49 UTCGHSA enrichment
Show 15 more
  1. 2026-07-05 05:57 UTCEG score recompute
  2. 2026-07-05 05:57 UTCGHSA enrichment
  3. 2026-07-05 02:30 UTCEPSS rescore
  4. 2026-07-05 02:05 UTCEG score recompute
  5. 2026-07-05 02:05 UTCGHSA enrichment
  6. 2026-07-04 22:13 UTCEG score recompute
  7. 2026-07-04 22:13 UTCGHSA enrichment
  8. 2026-07-04 18:21 UTCEG score recompute
  9. 2026-07-04 18:21 UTCGHSA enrichment
  10. 2026-07-04 14:30 UTCEG score recompute▲ 9.80
  11. 2026-07-04 14:30 UTCGHSA enrichment
  12. 2026-07-04 06:30 UTCEPSS rescore
  13. 2026-07-01 21:08 UTCNVD updateCVSS v3 → 9.8 · severity → CRITICAL
  14. 2026-07-01 17:08 UTCEG score recompute
  15. 2026-07-01 17:06 UTCNVD updatefirst tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-15646?
CVE-2025-15646 is a critical vulnerability published on July 1, 2026. 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()…
When was CVE-2025-15646 disclosed?
CVE-2025-15646 was first published in the National Vulnerability Database on July 1, 2026, with the most recent update on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-15646 actively exploited?
CVE-2025-15646 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 47.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2025-15646?
CVE-2025-15646 has a CVSS v3.1 base score of 9.8 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-15646?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-15646, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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