CVE-2026-64778

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-18. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — Patch released this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 6.5Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The issue was addressed with improved checks. This issue is fixed in Safari 26.6.1, iOS 18.7.10 and iPadOS 18.7.10, iOS 26.6.1 and iPadOS 26.6.1, macOS Tahoe 26.6.2, tvOS 27, visionOS 27, watchOS 27. Visiting a maliciously crafted website may leak sensitive data.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100CISA SSVC

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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
24th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 17, 2026

Last Modified

September 14, 2026

Advisory Details (3)

Auto-updated Aug 18, 2026
Patch available.
generic

About the security content of iOS 18.7.10 and iPadOS 18.7.10 - Apple Support

https://support.apple.com/en-us/148287
generic

About the security content of iOS 26.6.1 and iPadOS 26.6.1 - Apple Support

https://support.apple.com/en-us/148282
generic

About the security content of macOS Tahoe 26.6.2 - Apple Support

https://support.apple.com/en-us/148281

Vendor Advisories for CVE-2026-64778(3)

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

Patch Availability(2)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatwebkit2gtk3-0:2.54.0-1.el8_102026-09-30redhat
redhatwebkit2gtk3-0:2.54.0-1.el9_82026-09-21redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(6 across 3 ecosystems)
Debian:12(2)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk2.40.1-1 ... 2.54.0-1~exp1 (168 versions)
  • every version on: no fix on record
—
wpewebkit2.38.6-1 ... 2.54.0-2 (56 versions)
  • every version on: no fix on record
—
Debian:13(2)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk2.48.3-1 ... 2.53.92-1 (59 versions)
  • every version up to 2.54.0-1~deb13u1: fixed in 2.54.0-1~deb13u1
—
wpewebkit2.48.3-1 ... 2.54.0-2 (22 versions)
  • every version on: no fix on record
—
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
webkit2gtk2.48.3-1 ... 2.54.0-1~exp1 (61 versions)
  • every version on: no fix on record
—
wpewebkit2.48.3-1 ... 2.52.6-1 (20 versions)
  • every version up to 2.54.0-1: fixed in 2.54.0-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 23× in last 7d / 82× 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 143 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-64778?
CVE-2026-64778 is a medium vulnerability published on August 17, 2026. The issue was addressed with improved checks. This issue is fixed in Safari 26.6.1, iOS 18.7.10 and iPadOS 18.7.10, iOS 26.6.1 and iPadOS 26.6.1, macOS Tahoe 26.6.2, tvOS 27, visionOS 27, watchOS 27. Visiting a maliciously crafted website may leak sensitive data.
When was CVE-2026-64778 disclosed?
CVE-2026-64778 was first published on August 17, 2026, with the most recent update on September 14, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64778 actively exploited?
CVE-2026-64778 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (24th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-64778?
CVE-2026-64778 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-64778?
A fix for CVE-2026-64778 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-64778 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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