CVE-2026-9887

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-05-29. the CNA's CVSS baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:chrome, epss, ghsa
Trending — 4 sources updated this week
7.8
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.8Exploit: NoneExposed: 0

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

Use after free in Proxy in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to execute arbitrary code via a crafted PAC script. (Chromium security severity: Critical)

CVSS v3
7.8
EG Score
7.8(medium)
EPSS
12.2%
KEV
Not listed

Published

May 28, 2026

Last Modified

May 30, 2026

Advisory Details (2)

Auto-updated Jun 3, 2026
No patch confirmed yet.
generic

Chromium

https://issues.chromium.org/issues/511249104
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-2026-9887(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 15× in last 7d / 92× 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 196 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-9887?
CVE-2026-9887 is a high vulnerability published on May 28, 2026. Use after free in Proxy in Google Chrome prior to 148.0.7778.216 allowed a remote attacker to execute arbitrary code via a crafted PAC script. (Chromium security severity: Critical)
When was CVE-2026-9887 disclosed?
CVE-2026-9887 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-2026-9887 actively exploited?
CVE-2026-9887 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-9887?
CVE-2026-9887 has a CVSS v4.0 base score of 7.8 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-9887?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-9887, 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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