CVE-2026-9886

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

Score 9.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-29. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 4 sources updated this week
9.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.6Exploit: NoneExposed: 0

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

Use after free in Base in Google Chrome on Mac prior to 148.0.7778.216 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Critical)

CVSS v3
9.6
EG Score
9.6(medium)
EPSS
15.4%
KEV
Not listed

Published

May 28, 2026

Last Modified

June 3, 2026

Advisory Details (2)

Auto-updated Jun 1, 2026
No patch confirmed yet.
generic

Chromium

https://issues.chromium.org/issues/508456788
generic

Chrome Releases: Stable Channel Update for Desktop

https://chromereleases.googleblog.com/2026/05/stable-channel-update-for-desktop_0877304591.html

Vendor Advisories for CVE-2026-9886(2)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 25× in last 7d / 187× 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 493 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-9886?
CVE-2026-9886 is a critical vulnerability published on May 28, 2026. Use after free in Base in Google Chrome on Mac prior to 148.0.7778.216 allowed a remote attacker to potentially perform a sandbox escape via a crafted HTML page. (Chromium security severity: Critical)
When was CVE-2026-9886 disclosed?
CVE-2026-9886 was first published in the National Vulnerability Database on May 28, 2026, with the most recent update on June 3, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9886 actively exploited?
CVE-2026-9886 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 15.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-9886?
CVE-2026-9886 has a CVSS v3.1 base score of 9.6 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-9886?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9886, 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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