CVE-2026-43663

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-06-29. 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 — 4 sources updated 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%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 18.7.10 and iPadOS 18.7.10, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted web content may lead to an unexpected process crash.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
17%
KEV
Not listed

Published

June 29, 2026

Last Modified

August 17, 2026

Advisory Details (3)

Auto-updated Jun 29, 2026
No patch confirmed yet.
generic

About the security content of Safari 26.5.2 - Apple Support

https://support.apple.com/en-us/127685
generic

About the security content of macOS Tahoe 26.5.2 - Apple Support

https://support.apple.com/en-us/127595
generic

About the security content of iOS 26.5.2 and iPadOS 26.5.2 - Apple Support

https://support.apple.com/en-us/127594

Vendor Advisories for CVE-2026-43663(5)

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

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
redhatwebkit2gtk3-0:2.52.5-1.el9_42026-08-13redhat
redhatwebkit2gtk3-0:2.52.5-1.el9_62026-08-13redhat
redhatwebkit2gtk3-0:2.52.5-1.el8_102026-07-20redhat
redhatwebkit2gtk3-0:2.52.5-1.el9_82026-07-20redhat

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

(8 across 4 ecosystems)
Debian:11(2)
PackageVulnerable rangeFixed inDependents
webkit2gtk2.32.3-1 ... 2.53.4-1 (246 versions)——
wpewebkit2.32.3-2 ... 2.52.5-1 (90 versions)——
Debian:12(2)
PackageVulnerable rangeFixed inDependents
webkit2gtk2.40.1-1 ... 2.53.4-1 (161 versions)——
wpewebkit2.38.6-1 ... 2.52.5-1 (53 versions)——
Debian:13(2)
PackageVulnerable rangeFixed inDependents
webkit2gtk2.48.3-1 ... 2.52.4-1 (48 versions)2.52.5-1~deb13u1—
wpewebkit2.48.3-1 ... 2.52.5-1 (19 versions)——
Debian:14(2)
PackageVulnerable rangeFixed inDependents
webkit2gtk2.48.3-1 ... 2.52.5-1~deb13u1 (49 versions)2.52.5-1—
wpewebkit2.48.3-1 ... 2.52.4-1 (18 versions)2.52.5-1—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 29× in last 7d / 106× 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 146 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-43663?
CVE-2026-43663 is a medium vulnerability published on June 29, 2026. The issue was addressed with improved memory handling. This issue is fixed in Safari 26.5.2, iOS 18.7.10 and iPadOS 18.7.10, iOS 26.5.2 and iPadOS 26.5.2, macOS Tahoe 26.5.2, tvOS 26.6, visionOS 26.6, watchOS 26.6. Processing maliciously crafted web content may lead to an unexpected process crash.
When was CVE-2026-43663 disclosed?
CVE-2026-43663 was first published in the National Vulnerability Database on June 29, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43663 actively exploited?
CVE-2026-43663 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 83.3% of all scored CVEs.
What is the CVSS score of CVE-2026-43663?
CVE-2026-43663 has a CVSS v3.1 base score of 6.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-43663?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43663, 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

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-43663

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