CVE-2026-7978

HIGHNVD 8.18.1
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

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, GitHub Security Advisory, NVD CVSS v3
8.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.3%CVSS: 8.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
Vendor severity
MEDIUMper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Medium)
EG Score
8.1HIGHmedium confidence
EG Risk
37
EG Risk 37/100

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 (value × EchelonGraph’s weight)
Severity81% × 45%
The EG Score, 8.1 of 10.
Exploitation0.3% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.3%
EPSS %ILE
22nd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 6, 2026

Last Modified

May 6, 2026

Advisory Details (2)

Auto-updated May 20, 2026
Patch available.
Web page

Chromium

https://issues.chromium.org/issues/497828892
Web page

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.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
chromium100.0.4896.127-1 ... 99.0.4844.84-1~deb11u1 (500 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
chromium113.0.5672.126-1 ... 147.0.7727.55-1~deb13u1 (348 versions)
  • every version up to 148.0.7778.96-1~deb12u1: fixed in 148.0.7778.96-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
chromium138.0.7204.183-1 ... 148.0.7778.96-1~deb12u1 (114 versions)
  • every version up to 148.0.7778.96-1~deb13u1: fixed in 148.0.7778.96-1~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
chromium138.0.7204.183-1 ... 148.0.7778.96-1~deb13u1 (115 versions)
  • every version up to 148.0.7778.96-1: fixed in 148.0.7778.96-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 11× in last 7d / 30× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 94 of 268 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 6 repeat rows among the latest 100 are merged into the row they repeat. The 174 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  2. 2026-10-12 14:58 UTCEG score recompute
  3. 2026-10-11 19:22 UTCEG score recompute
  4. 2026-10-11 16:38 UTCEG score recompute
  5. 2026-10-11 13:56 UTCEG score recompute
  6. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  7. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  8. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  9. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  10. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  11. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  12. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  13. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  14. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  15. 2026-10-02 17:57 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  17. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  18. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  19. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  20. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  21. 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.3% · 22nd percentile
  22. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.3% · 21st percentile
  23. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  24. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  25. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.2% · 14th percentile
Show 69 more
  1. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  2. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  3. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  4. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  5. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  6. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  7. 2026-09-08 22:01 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  8. 2026-09-06 13:48 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  9. 2026-09-05 15:31 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  10. 2026-09-04 05:07 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  11. 2026-09-02 14:12 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  12. 2026-09-01 13:54 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  13. 2026-09-01 04:40 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  14. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  15. 2026-08-30 01:22 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  16. 2026-08-28 21:42 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  17. 2026-08-27 14:25 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  18. 2026-08-26 14:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  19. 2026-08-24 14:18 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  20. 2026-08-23 19:44 UTCEG score recompute
  21. 2026-08-23 19:44 UTCVendor advisory
  22. 2026-08-23 19:44 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1
  23. 2026-08-21 23:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  24. 2026-08-20 22:56 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  25. 2026-08-19 17:04 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  26. 2026-08-18 13:49 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  27. 2026-08-17 13:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  28. 2026-08-17 12:51 UTCEG score recompute
  29. 2026-08-17 12:51 UTCVendor advisory
  30. 2026-08-17 12:51 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1
  31. 2026-08-16 14:56 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  32. 2026-08-16 04:49 UTCEG score recompute
  33. 2026-08-16 04:49 UTCVendor advisory
  34. 2026-08-16 04:49 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1
  35. 2026-08-16 02:15 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  36. 2026-08-15 01:41 UTCEG score recompute
  37. 2026-08-15 01:41 UTCVendor advisory
  38. 2026-08-15 01:41 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1
  39. 2026-08-15 01:31 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  40. 2026-08-14 14:32 UTCVendor advisory
  41. 2026-08-14 14:32 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1
  42. 2026-08-14 03:22 UTCEG score recompute
  43. 2026-08-14 03:22 UTCVendor advisory
  44. 2026-08-14 03:22 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1
  45. 2026-08-13 22:00 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  46. 2026-08-13 04:06 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1
  47. 2026-08-12 16:57 UTCEG score recompute
  48. 2026-08-12 16:57 UTCVendor advisory
  49. 2026-08-12 16:57 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1
  50. 2026-08-12 13:51 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  51. 2026-08-11 15:58 UTCEG score recompute
  52. 2026-08-11 15:58 UTCVendor advisory
  53. 2026-08-11 15:58 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1
  54. 2026-08-11 13:43 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  55. 2026-08-11 01:28 UTCEG score recompute
  56. 2026-08-11 01:28 UTCVendor advisory
  57. 2026-08-11 01:28 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1
  58. 2026-08-11 00:00 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  59. 2026-08-10 12:00 UTCVendor advisory
  60. 2026-08-10 12:00 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1
  61. 2026-08-10 00:51 UTCEG score recompute
  62. 2026-08-10 00:51 UTCVendor advisory
  63. 2026-08-10 00:51 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1
  64. 2026-08-09 13:47 UTCEPSS rescoreEPSS 0.2% · 14th percentile
  65. 2026-08-09 13:42 UTCVendor advisory
  66. 2026-08-09 13:42 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1
  67. 2026-08-09 02:31 UTCEG score recompute
  68. 2026-08-09 02:31 UTCVendor advisory
  69. 2026-08-09 02:31 UTCGHSA enrichmentGHSA-vc4p-4fpj-c36p · GitHub severity HIGH · GitHub CVSS 8.1

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-7978?
CVE-2026-7978 is a high-severity vulnerability; its CVE record was 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 the CVE record for CVE-2026-7978 published?
The CVE record for CVE-2026-7978 was published on May 6, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of May 6, 2026; the record at its source may have been updated since.
Is CVE-2026-7978 actively exploited?
CVE-2026-7978 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.3% probability of exploitation in the next 30 days (22nd percentile of EPSS-scored CVEs).
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?
A fix for CVE-2026-7978 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-7978 are linked in the Vendor Advisories panel on this page.

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