CVE-2026-43997

CRITICALPre-NVD 10.010.0
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 10.0 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.8% (54th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from a secondary CVSS source
Sources: EPSS, a secondary CVSS source
Trending — 3 sources updated this weekElevated
10.0EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • CISA's Vulnrichment rates exploitation as PoC; EchelonGraph holds no exploit-code reference for it
CISA-KEV: Not listedEPSS PROB: 0.8%CVSS: 10.0Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, it is possible to obtain the host Object. There are various ways to use the host Object, to escape the sandbox, one example would be using HostObject.getOwnPropertySymbols to obtain Symbol(nodejs.util.inspect.custom). This vulnerability is fixed in 3.11.0.

CVSS v3
10.0
EG Score
10.0CRITICALmedium confidence
EG Risk
76
EG Risk 76/100

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)
Severity100% × 45%
The EG Score, 10.0 of 10.
Exploitation40% × 40%
EchelonGraph's fixed weight for EG-KEV Tier 3 (Elevated): a constant, not a probability.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low, Track* at medium and Attend at high mission impact.
Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.8%
EPSS %ILE
54th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low, Track* at medium and Attend at high mission impact.

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation public PoC (CISA Vulnrichment) · Automatable yes (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)3 days if the affected system is publicly exposed; 60 days if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable yes (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 13, 2026

Last Modified

September 7, 2026

Advisory Details (5)

Auto-updated Oct 13, 2026
🔬 Proof of concept available. Patch available. Sources: github, redhat.
Red HatMentions a patch (unverified)
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-43997.json
GitHub advisoryMentions a patch (unverified)🟡 PoC Available

Sandbox Escape · Advisory · patriksimek/vm2 · GitHub

https://github.com/patriksimek/vm2/security/advisories/GHSA-47x8-96vw-5wg6
Red Hat

2477203 – (CVE-2026-43997) CVE-2026-43997 vm2: vm2: Arbitrary code execution via sandbox escape

https://bugzilla.redhat.com/show_bug.cgi?id=2477203
Red HatMentions a patch (unverified)

CVE-2026-43997 - 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-2026-43997
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:50850

Vendor Advisories for CVE-2026-43997(1)

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

Patch Availability(1)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
redhatansible-automation-platform/automation-portal:17858542262026-08-05redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
vm2—
  • every version up to 3.11.0: fixed in 3.11.0
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 20× in last 7d / 35× 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 100 of 245 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. None are among the latest 100 rows. The 145 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 18:57 UTCEG score recompute
  2. 2026-10-16 18:57 UTCVendor advisory
  3. 2026-10-16 16:42 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  4. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  5. 2026-10-15 16:13 UTCEG score recompute
  6. 2026-10-15 16:13 UTCVendor advisory
  7. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  8. 2026-10-14 10:16 UTCEG score recompute
  9. 2026-10-14 10:16 UTCVendor advisory
  10. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  11. 2026-10-13 08:44 UTCEG score recompute
  12. 2026-10-13 08:44 UTCVendor advisory
  13. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  14. 2026-10-12 16:05 UTCEG score recompute
  15. 2026-10-12 07:52 UTCVendor advisory
  16. 2026-10-11 19:47 UTCEG score recompute
  17. 2026-10-11 17:02 UTCEG score recompute
  18. 2026-10-11 14:27 UTCEG score recompute
  19. 2026-10-11 13:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  20. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  21. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  22. 2026-10-08 17:12 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  23. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  24. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.8% · 54th percentile
  25. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
Show 75 more
  1. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  2. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  3. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  4. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  5. 2026-09-27 04:45 UTCOSV refresh
  6. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.8% · 53rd percentile
  7. 2026-09-23 17:53 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  8. 2026-09-20 20:15 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  9. 2026-09-18 19:28 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  10. 2026-09-17 19:31 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  11. 2026-09-16 14:08 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  12. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  13. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  14. 2026-09-12 15:01 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  15. 2026-09-11 14:53 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  16. 2026-09-11 09:37 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  17. 2026-09-10 09:34 UTCEPSS rescoreEPSS 1.0% · 60th percentile
  18. 2026-09-08 22:00 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  19. 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  20. 2026-09-07 13:57 UTCEG score recompute
  21. 2026-09-07 13:57 UTCVendor advisory
  22. 2026-09-07 12:45 UTCEG score recompute
  23. 2026-09-07 12:45 UTCVendor advisory
  24. 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  25. 2026-09-04 13:29 UTCEG score recompute
  26. 2026-09-04 13:29 UTCVendor advisory
  27. 2026-09-04 12:22 UTCEG score recompute
  28. 2026-09-04 12:22 UTCVendor advisory
  29. 2026-09-04 05:06 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  30. 2026-09-02 14:12 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  31. 2026-09-01 13:54 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  32. 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  33. 2026-08-30 01:22 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  34. 2026-08-28 21:41 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  35. 2026-08-27 14:25 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  36. 2026-08-26 14:46 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  37. 2026-08-25 13:49 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  38. 2026-08-23 21:33 UTCVendor advisory
  39. 2026-08-23 17:52 UTCEG score recompute
  40. 2026-08-23 17:52 UTCVendor advisory
  41. 2026-08-23 00:19 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  42. 2026-08-21 23:49 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  43. 2026-08-20 22:55 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  44. 2026-08-20 20:57 UTCEG score recompute
  45. 2026-08-20 20:57 UTCVendor advisory
  46. 2026-08-19 17:04 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  47. 2026-08-18 13:48 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  48. 2026-08-17 14:42 UTCEG score recompute
  49. 2026-08-17 14:42 UTCVendor advisory
  50. 2026-08-17 13:47 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  51. 2026-08-17 10:39 UTCEG score recompute
  52. 2026-08-17 10:39 UTCVendor advisory
  53. 2026-08-16 14:56 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  54. 2026-08-16 11:19 UTCVendor advisory
  55. 2026-08-16 07:41 UTCVendor advisory
  56. 2026-08-16 04:03 UTCEG score recompute
  57. 2026-08-16 04:03 UTCVendor advisory
  58. 2026-08-16 02:14 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  59. 2026-08-15 01:30 UTCEPSS rescoreEPSS 1.0% · 59th percentile
  60. 2026-08-15 00:16 UTCVendor advisory
  61. 2026-08-14 20:39 UTCVendor advisory
  62. 2026-08-14 17:02 UTCVendor advisory
  63. 2026-08-14 13:24 UTCVendor advisory
  64. 2026-08-14 09:47 UTCVendor advisory
  65. 2026-08-14 06:10 UTCVendor advisory
  66. 2026-08-14 02:32 UTCEG score recompute
  67. 2026-08-14 02:32 UTCVendor advisory
  68. 2026-08-13 22:00 UTCEPSS rescoreEPSS 1.0% · 58th percentile
  69. 2026-08-13 09:59 UTCVendor advisory
  70. 2026-08-13 06:22 UTCVendor advisory
  71. 2026-08-13 02:42 UTCVendor advisory
  72. 2026-08-12 23:05 UTCVendor advisory
  73. 2026-08-12 19:28 UTCVendor advisory
  74. 2026-08-12 15:50 UTCEG score recompute
  75. 2026-08-12 15:50 UTCVendor advisory

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Frequently asked(5)

What is CVE-2026-43997?
CVE-2026-43997 is a critical-severity vulnerability; its CVE record was published on May 13, 2026. vm2 is an open source vm/sandbox for Node.js. Prior to 3.11.0, it is possible to obtain the host Object. There are various ways to use the host Object, to escape the sandbox, one example would be using HostObject.getOwnPropertySymbols to obtain Symbol(nodejs.util.inspect.custom). This vulnerability…
When was the CVE record for CVE-2026-43997 published?
The CVE record for CVE-2026-43997 was published on May 13, 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 September 7, 2026; the record at its source may have been updated since.
Is CVE-2026-43997 actively exploited?
CVE-2026-43997 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.8% probability of exploitation in the next 30 days (54th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-43997?
CVE-2026-43997 has a CVSS base score of 10.0 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-43997?
A fix for CVE-2026-43997 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-43997 are linked in the Vendor Advisories panel on this page.

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