CVE-2026-9891

CRITICALPre-NVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

Score 9.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-29. the CNA's CVSS baseline 9.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:chrome, epss, ghsa
Trending — 4 sources updated this week
9.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.0Exploit: NoneExposed: 0

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

Use after free in Extensions in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted Chrome Extension. (Chromium security severity: Critical)

CVSS v3
9.0
EG Score
9.0(medium)
EPSS
15.7%
KEV
Not listed

Published

May 28, 2026

Last Modified

May 30, 2026

Advisory Details (2)

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

Chromium

https://issues.chromium.org/issues/513508128
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-2026-9891(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 21× in last 7d / 169× 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 435 total refreshes for this CVE.

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

Related CVEs(same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-9891?
CVE-2026-9891 is a critical vulnerability published on May 28, 2026. Use after free in Extensions in Google Chrome prior to 148.0.7778.216 allowed a remote attacker who had compromised the renderer process to potentially perform a sandbox escape via a crafted Chrome Extension. (Chromium security severity: Critical)
When was CVE-2026-9891 disclosed?
CVE-2026-9891 was first published in the National Vulnerability Database on May 28, 2026, with the most recent update on May 30, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-9891 actively exploited?
CVE-2026-9891 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 15.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-9891?
CVE-2026-9891 has a CVSS v4.0 base score of 9.0 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-9891?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9891, 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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