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 — 3 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)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
47.9%
KEV
Not listed

Published

July 1, 2026

Last Modified

July 2, 2026

Advisory Details (4)

Auto-updated Jul 11, 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 13× in last 7d / 114× 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.

Showing the most recent 100 of 114 total refreshes for this CVE.

  1. 2026-07-23 14:17 UTCEPSS rescore
  2. 2026-07-23 02:49 UTCEG score recompute
  3. 2026-07-22 14:07 UTCEPSS rescore
  4. 2026-07-22 14:07 UTCEPSS rescore
  5. 2026-07-21 15:24 UTCEPSS rescore
  6. 2026-07-19 14:30 UTCEPSS rescore
  7. 2026-07-19 14:30 UTCEPSS rescore
  8. 2026-07-19 02:28 UTCEPSS rescore
  9. 2026-07-19 02:28 UTCEPSS rescore
  10. 2026-07-18 10:03 UTCEPSS rescore
  11. 2026-07-17 05:04 UTCGHSA enrichment
  12. 2026-07-17 01:12 UTCGHSA enrichment
  13. 2026-07-16 21:21 UTCGHSA enrichment
  14. 2026-07-16 17:29 UTCGHSA enrichment
  15. 2026-07-16 17:02 UTCEPSS rescore
  16. 2026-07-16 17:02 UTCEPSS rescore
  17. 2026-07-16 13:04 UTCGHSA enrichment
  18. 2026-07-16 09:10 UTCGHSA enrichment
  19. 2026-07-16 05:18 UTCGHSA enrichment
  20. 2026-07-16 01:26 UTCGHSA enrichment
  21. 2026-07-15 21:35 UTCGHSA enrichment
  22. 2026-07-15 17:43 UTCGHSA enrichment
  23. 2026-07-15 16:57 UTCEPSS rescore
  24. 2026-07-15 16:57 UTCEPSS rescore
  25. 2026-07-15 13:51 UTCGHSA enrichment
Show 75 more
  1. 2026-07-15 09:56 UTCGHSA enrichment
  2. 2026-07-15 06:03 UTCGHSA enrichment
  3. 2026-07-15 02:11 UTCGHSA enrichment
  4. 2026-07-15 01:59 UTCEPSS rescore
  5. 2026-07-15 01:59 UTCEPSS rescore
  6. 2026-07-14 22:19 UTCGHSA enrichment
  7. 2026-07-14 18:27 UTCGHSA enrichment
  8. 2026-07-14 14:36 UTCGHSA enrichment
  9. 2026-07-14 10:44 UTCGHSA enrichment
  10. 2026-07-14 06:47 UTCGHSA enrichment
  11. 2026-07-14 02:55 UTCGHSA enrichment
  12. 2026-07-13 23:04 UTCGHSA enrichment
  13. 2026-07-13 22:29 UTCEPSS rescore
  14. 2026-07-13 22:29 UTCEPSS rescore
  15. 2026-07-13 19:12 UTCGHSA enrichment
  16. 2026-07-13 15:20 UTCGHSA enrichment
  17. 2026-07-13 11:27 UTCGHSA enrichment
  18. 2026-07-13 07:35 UTCGHSA enrichment
  19. 2026-07-13 06:12 UTCEPSS rescore
  20. 2026-07-13 03:44 UTCGHSA enrichment
  21. 2026-07-12 23:53 UTCGHSA enrichment
  22. 2026-07-12 20:01 UTCGHSA enrichment
  23. 2026-07-12 16:09 UTCGHSA enrichment
  24. 2026-07-12 12:16 UTCGHSA enrichment
  25. 2026-07-12 08:24 UTCGHSA enrichment
  26. 2026-07-12 05:46 UTCEPSS rescore
  27. 2026-07-12 05:45 UTCEPSS rescore
  28. 2026-07-12 04:31 UTCGHSA enrichment
  29. 2026-07-12 00:39 UTCGHSA enrichment
  30. 2026-07-11 20:48 UTCGHSA enrichment
  31. 2026-07-11 16:56 UTCGHSA enrichment
  32. 2026-07-11 13:05 UTCGHSA enrichment
  33. 2026-07-11 09:12 UTCGHSA enrichment
  34. 2026-07-11 08:26 UTCEPSS rescore
  35. 2026-07-11 08:26 UTCEPSS rescore
  36. 2026-07-11 05:20 UTCGHSA enrichment
  37. 2026-07-11 01:29 UTCGHSA enrichment
  38. 2026-07-10 21:37 UTCGHSA enrichment
  39. 2026-07-10 17:45 UTCGHSA enrichment
  40. 2026-07-10 13:53 UTCGHSA enrichment
  41. 2026-07-10 10:01 UTCGHSA enrichment
  42. 2026-07-10 06:10 UTCGHSA enrichment
  43. 2026-07-10 02:14 UTCGHSA enrichment
  44. 2026-07-09 22:23 UTCGHSA enrichment
  45. 2026-07-09 19:09 UTCEPSS rescore
  46. 2026-07-09 18:32 UTCGHSA enrichment
  47. 2026-07-09 14:37 UTCGHSA enrichment
  48. 2026-07-09 10:44 UTCGHSA enrichment
  49. 2026-07-09 06:42 UTCGHSA enrichment
  50. 2026-07-09 02:50 UTCGHSA enrichment
  51. 2026-07-08 22:59 UTCGHSA enrichment
  52. 2026-07-08 19:08 UTCGHSA enrichment
  53. 2026-07-08 15:17 UTCGHSA enrichment
  54. 2026-07-08 15:14 UTCEPSS rescore
  55. 2026-07-08 11:25 UTCGHSA enrichment
  56. 2026-07-08 07:34 UTCGHSA enrichment
  57. 2026-07-08 03:42 UTCGHSA enrichment
  58. 2026-07-07 23:49 UTCGHSA enrichment
  59. 2026-07-07 19:58 UTCGHSA enrichment
  60. 2026-07-07 16:06 UTCGHSA enrichment
  61. 2026-07-07 13:45 UTCEPSS rescore
  62. 2026-07-07 12:12 UTCGHSA enrichment
  63. 2026-07-07 08:20 UTCGHSA enrichment
  64. 2026-07-07 04:29 UTCGHSA enrichment
  65. 2026-07-07 00:37 UTCGHSA enrichment
  66. 2026-07-06 20:45 UTCGHSA enrichment
  67. 2026-07-06 16:49 UTCGHSA enrichment
  68. 2026-07-06 16:26 UTCEPSS rescore
  69. 2026-07-06 12:54 UTCGHSA enrichment
  70. 2026-07-06 09:00 UTCGHSA enrichment
  71. 2026-07-06 05:06 UTCGHSA enrichment
  72. 2026-07-06 02:22 UTCEPSS rescore
  73. 2026-07-06 02:22 UTCEPSS rescore
  74. 2026-07-06 01:15 UTCGHSA enrichment
  75. 2026-07-05 21:23 UTCGHSA enrichment

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 47.9% 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.

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