CVE-2026-84042

HIGHPre-NVD 7.87.8
EchelonGraph scoreMEDIUM confidence

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

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-10. A secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, a secondary CVSS source
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan mitigationRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.1%CVSS: 7.8Exploit: None knownExposed services: Not assessed

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

A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29

CVSS v3
7.8
EG Score
7.8HIGHmedium confidence
EG Risk
35
EG Risk 35/100

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)
Severity78% × 45%
The EG Score, 7.8 of 10.
Exploitation0.1% × 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: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.1%
EPSS %ILE
below the 1st
KEV
Not listed

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

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

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

September 10, 2026

Last Modified

September 15, 2026

Advisory Details (3)

Auto-updated Sep 10, 2026
No fix on record yet. Sources: redhat.
Web page

GitHub - containers/crun: A fast and lightweight fully featured OCI runtime and C library for running containers · GitHub

https://github.com/containers/crun/
Red Hat

2531222 – (CVE-2026-84042) CVE-2026-84042 crun: crun: rootful krun with passt executes container payload as host root

https://bugzilla.redhat.com/show_bug.cgi?id=2531222
Red HatMentions a patch (unverified)

CVE-2026-84042 - Red Hat Customer Portal

Affected: Red Hat Enterprise Linux 8 or OpenShift Container Platform 4, is affected by this vulnerability and a fix may be released to a

https://access.redhat.com/security/cve/CVE-2026-84042

Vendor Advisories for CVE-2026-84042(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 26× in last 7d / 107× 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 99 of 121 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. 1 repeat row among the latest 100 is merged into the row it repeats. The 22 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-11 19:18 UTCEG score recompute
  2. 2026-10-11 16:35 UTCEG score recompute
  3. 2026-10-11 14:23 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  4. 2026-10-11 13:52 UTCEG score recompute
  5. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  6. 2026-10-10 23:19 UTCEG score recompute
  7. 2026-10-10 23:19 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  8. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  9. 2026-10-10 08:34 UTCEG score recompute
  10. 2026-10-10 08:34 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  11. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  12. 2026-10-09 19:59 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  13. 2026-10-08 23:52 UTCEG score recompute
  14. 2026-10-08 23:52 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  15. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  16. 2026-10-08 00:39 UTCEG score recompute
  17. 2026-10-08 00:39 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  18. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  19. 2026-10-07 12:05 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  20. 2026-10-06 23:26 UTCEG score recompute
  21. 2026-10-06 23:26 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  22. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  23. 2026-10-06 10:52 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  24. 2026-10-05 22:04 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  25. 2026-10-05 09:14 UTCEG score recompute
Show 74 more
  1. 2026-10-05 09:14 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  2. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  3. 2026-10-04 20:40 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  4. 2026-10-04 08:05 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  5. 2026-10-03 19:29 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  6. 2026-10-03 06:56 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  7. 2026-10-02 18:22 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  8. 2026-10-02 05:48 UTCEG score recompute
  9. 2026-10-02 05:48 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  10. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  11. 2026-10-01 15:56 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  12. 2026-10-01 03:22 UTCEG score recompute
  13. 2026-10-01 03:22 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  14. 2026-09-30 15:04 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  15. 2026-09-30 14:49 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  16. 2026-09-30 01:59 UTCEG score recompute
  17. 2026-09-30 01:59 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  18. 2026-09-29 09:14 UTCEG score recompute
  19. 2026-09-29 09:14 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  20. 2026-09-28 20:25 UTCEG score recompute
  21. 2026-09-28 20:25 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  22. 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  23. 2026-09-28 07:51 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  24. 2026-09-27 19:17 UTCEG score recompute
  25. 2026-09-27 19:17 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  26. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  27. 2026-09-27 06:43 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  28. 2026-09-26 18:08 UTCEG score recompute
  29. 2026-09-26 18:08 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  30. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  31. 2026-09-26 05:34 UTCEG score recompute
  32. 2026-09-26 05:34 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  33. 2026-09-25 16:43 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  34. 2026-09-25 04:09 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  35. 2026-09-24 15:35 UTCEG score recompute
  36. 2026-09-24 15:35 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  37. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.1% · 2nd percentile
  38. 2026-09-24 03:01 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  39. 2026-09-23 14:27 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  40. 2026-09-23 01:54 UTCEG score recompute
  41. 2026-09-23 01:54 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  42. 2026-09-22 16:01 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  43. 2026-09-22 13:19 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  44. 2026-09-22 00:45 UTCEG score recompute
  45. 2026-09-22 00:44 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  46. 2026-09-21 21:09 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  47. 2026-09-21 12:10 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  48. 2026-09-20 23:36 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  49. 2026-09-20 11:01 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  50. 2026-09-19 22:27 UTCEG score recompute
  51. 2026-09-19 22:27 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  52. 2026-09-19 09:53 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  53. 2026-09-18 21:19 UTCEG score recompute
  54. 2026-09-18 21:19 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  55. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  56. 2026-09-18 08:38 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  57. 2026-09-17 20:04 UTCEG score recompute
  58. 2026-09-17 20:04 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  59. 2026-09-17 19:32 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  60. 2026-09-17 07:16 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  61. 2026-09-16 18:41 UTCEG score recompute
  62. 2026-09-16 18:41 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  63. 2026-09-16 14:09 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  64. 2026-09-16 06:07 UTCEG score recompute
  65. 2026-09-16 06:07 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  66. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile
  67. 2026-09-15 17:33 UTCEG score recompute
  68. 2026-09-15 17:33 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  69. 2026-09-15 16:35 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  70. 2026-09-15 15:25 UTCEG score recompute
  71. 2026-09-15 15:25 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  72. 2026-09-15 12:04 UTCEG score recompute
  73. 2026-09-15 12:03 UTCGHSA enrichmentGHSA-ggww-wrxv-mmw2 · GitHub severity HIGH · GitHub CVSS 7.8
  74. 2026-09-15 03:12 UTCEPSS rescoreEPSS 0.1% · below the 1st percentile

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-84042?
CVE-2026-84042 is a high-severity vulnerability; its CVE record was published on September 10, 2026. A flaw was found in crun. When crun is built with libkrun and a container is started rootful with passt networking (krun.use_passt), crun can execute attacker-controlled payload from the container image with host root privileges. The issue is a regression in crun 1.29. It affects crun >= 1.29
When was CVE-2026-84042 made public?
CVE-2026-84042 was made public on September 10, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on September 10, 2026. EchelonGraph's copy of the record carries a last-modified date of September 15, 2026; the record at its source may have been updated since.
Is CVE-2026-84042 actively exploited?
CVE-2026-84042 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.1% probability of exploitation in the next 30 days (below the 1st percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-84042?
CVE-2026-84042 has a CVSS base score of 7.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-84042?
No fix for CVE-2026-84042 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-84042 are linked in the Vendor Advisories panel on this page.

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