CVE-2026-106378

HIGHPre-NVD 8.38.3
EchelonGraph scoreMEDIUM confidence

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

Score 8.3 from GitHub Security Advisory (severity: HIGH) published 2026-10-06. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 8.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: CISA-ADP (Vulnrichment) CVSS v3.1, EPSS, GitHub Security Advisory
Elevated

Also known asEUVD-2026-93701 (ENISA EUVD) · GHSA-h2mx-fjwm-h5h6 (GitHub Security Advisories)Source: ENISA EUVD

8.3EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • Public exploit or proof-of-concept code is available
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 8.3Exploit: Public PoCExposed services: Not assessed

A fix is available — apply it.

Privilege elevation in Sandbox in Google Chrome on on Mac prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)

CVSS v3
8.3
Vendor severity
MEDIUMper Google (Chromium)Vendor's own band, not a CVSS rating — advisory text: (Chromium security severity: Medium)
EG Score
8.3HIGHmedium confidence
EG Risk
53
EG Risk 53/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity83% × 45%
Impact severity (EG Severity): CVSS 8.3 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
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
0.4%
EPSS %ILE
36th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (8.3): severity, escalated by confirmed exploitation. This CVE's 8.3 is its impact severity (EG Severity), not escalated.

EG Severity
8.3 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-11-12). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.

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.

The score's inputs: 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

October 6, 2026

Last Modified

October 7, 2026

Advisory Details (2)

Auto-updated Oct 6, 2026
Patch available.

Vendor Advisories for CVE-2026-106378(2)

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

Affected Packages

(3 across 3 ecosystems)
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
chromium113.0.5672.126-1 ... 154.0.8037.92-1~deb13u1 (431 versions)
  • every version up to 155.0.8059.39-1~deb12u1: fixed in 155.0.8059.39-1~deb12u1
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
chromium138.0.7204.183-1 ... 155.0.8059.39-1~deb12u1 (197 versions)
  • every version up to 155.0.8059.39-1~deb13u1: fixed in 155.0.8059.39-1~deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
chromium138.0.7204.183-1 ... 155.0.8059.39-1~deb13u1 (198 versions)
  • every version up to 155.0.8059.39-1: fixed in 155.0.8059.39-1
—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 8× in last 7d / 43× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

  1. 2026-11-13 16:50 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  2. 2026-11-12 18:48 UTCEchelonGraph re-scored
  3. 2026-11-12 18:48 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  4. 2026-11-12 16:32 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  5. 2026-11-11 16:37 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  6. 2026-11-10 16:41 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  7. 2026-11-09 16:34 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  8. 2026-11-08 16:38 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-11-07 16:38 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  10. 2026-11-06 16:35 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  11. 2026-11-05 21:34 UTCEchelonGraph re-scored
  12. 2026-11-05 21:34 UTCVendor advisory
  13. 2026-11-05 21:34 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  14. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  15. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  16. 2026-11-03 17:28 UTCEchelonGraph re-scored
  17. 2026-11-03 17:28 UTCVendor advisory
  18. 2026-11-03 17:28 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  19. 2026-11-03 16:46 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  20. 2026-11-03 16:27 UTCEchelonGraph re-scored
  21. 2026-11-03 16:27 UTCVendor advisory
  22. 2026-11-03 16:27 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  23. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  24. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  25. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
Show 60 more
  1. 2026-10-31 13:53 UTCEchelonGraph re-scored
  2. 2026-10-31 13:53 UTCVendor advisory
  3. 2026-10-31 13:53 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  4. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  5. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  6. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  7. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  8. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  9. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.3% · 25th percentile
  10. 2026-10-25 14:54 UTCEchelonGraph re-scored
  11. 2026-10-24 16:41 UTCEchelonGraph re-scored
  12. 2026-10-24 16:41 UTCVendor advisory
  13. 2026-10-24 16:41 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  14. 2026-10-24 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  15. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  16. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  17. 2026-10-21 16:32 UTCEPSS rescoreEPSS 0.3% · 24th percentile
  18. 2026-10-20 16:32 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  19. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  20. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  21. 2026-10-18 05:08 UTCEchelonGraph re-scored
  22. 2026-10-17 19:24 UTCEchelonGraph re-scored
  23. 2026-10-17 19:24 UTCVendor advisory
  24. 2026-10-17 19:24 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  25. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  26. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  27. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  28. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  29. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  30. 2026-10-12 16:39 UTCEchelonGraph re-scored
  31. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  32. 2026-10-11 21:47 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  33. 2026-10-11 20:14 UTCEchelonGraph re-scored
  34. 2026-10-11 18:27 UTCEchelonGraph re-scored
  35. 2026-10-11 15:00 UTCEchelonGraph re-scored
  36. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  37. 2026-10-11 08:50 UTCEchelonGraph re-scored
  38. 2026-10-11 08:50 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  39. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  40. 2026-10-10 19:51 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  41. 2026-10-10 06:47 UTCEchelonGraph re-scored
  42. 2026-10-10 06:46 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  43. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  44. 2026-10-09 17:48 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  45. 2026-10-09 04:51 UTCEchelonGraph re-scored
  46. 2026-10-09 04:51 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  47. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.3% · 23rd percentile
  48. 2026-10-08 15:53 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  49. 2026-10-08 02:55 UTCEchelonGraph re-scored
  50. 2026-10-08 02:55 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  51. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.3% · 20th percentile
  52. 2026-10-07 13:57 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  53. 2026-10-07 04:20 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  54. 2026-10-07 04:02 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  55. 2026-10-06 21:33 UTCEchelonGraph re-scored▲ 1.80
  56. 2026-10-06 21:33 UTCGHSA enrichmentGHSA-h2mx-fjwm-h5h6 · GitHub severity HIGH · GitHub CVSS 8.3
  57. 2026-10-06 20:22 UTCMITRE cvelistV5CVSS v3 → 8.3 · severity → HIGH
  58. 2026-10-06 19:31 UTCNVD update
  59. 2026-10-06 18:59 UTCEchelonGraph re-scoredFirst assessed: 6.5 MEDIUM
  60. 2026-10-06 18:57 UTCMITRE cvelistV5first tracked

Publicly available exploits

(1 reference)

Public exploit code is referenced for this CVE (1 GitHub PoC). Defenders should treat patch urgency accordingly.

  • GitHub PoCleisureprog/CVE-2026-106378
    Published Oct 30, 2026

    CVE-2026-106378 is a privilege escalation in the Google Chrome sandbox on macOS. An attacker who has already compromised the renderer process can execute arbitrary code **outside the sandbox** via a crafted HTML page.

    Open source ↗

Frequently asked(5)

What is CVE-2026-106378?
CVE-2026-106378 is a high-severity vulnerability; its CVE record was published on October 6, 2026. Privilege elevation in Sandbox in Google Chrome on on Mac prior to 155.0.8059.39 allowed a remote attacker who had compromised the renderer process to execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
When was the CVE record for CVE-2026-106378 published?
The CVE record for CVE-2026-106378 was published on October 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 October 7, 2026; the record at its source may have been updated since.
Is CVE-2026-106378 actively exploited?
CVE-2026-106378 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (36th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-106378?
CVE-2026-106378 has a CVSS v3.1 base score of 8.3 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-106378?
A fix for CVE-2026-106378 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-106378 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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