CVE-2026-7978

HIGHNVD 8.18.1—
EchelonGraph scoreMEDIUM confidence

Score 8.1 from GitHub Security Advisory (severity: HIGH) published 2026-05-06. NVD baseline CVSS 8.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.1Exploit: NoneExposed: 0

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

Inappropriate implementation in Companion in Google Chrome on Mac prior to 148.0.7778.96 allowed a remote attacker to perform OS-level privilege escalation via malicious network traffic. (Chromium security severity: Medium)

CVSS v3
8.1
EG Score
8.1(medium)
EPSS
14.6%
KEV
Not listed

Published

May 6, 2026

Last Modified

May 6, 2026

Advisory Details (2)

Auto-updated May 20, 2026
No patch confirmed yet.
generic

Chromium

https://issues.chromium.org/issues/497828892
generic

Chrome Releases: Stable Channel Update for Desktop

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

Vendor Advisories for CVE-2026-7978(1)

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 11× in last 7d / 53× 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 150 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-7978?
CVE-2026-7978 is a high vulnerability published on May 6, 2026. Inappropriate implementation in Companion in Google Chrome on Mac prior to 148.0.7778.96 allowed a remote attacker to perform OS-level privilege escalation via malicious network traffic. (Chromium security severity: Medium)
When was CVE-2026-7978 disclosed?
CVE-2026-7978 was first published in the National Vulnerability Database on May 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-7978 actively exploited?
CVE-2026-7978 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 14.6% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-7978?
CVE-2026-7978 has a CVSS v3 base score of 8.1 (NVD).
How do I remediate CVE-2026-7978?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-7978, 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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