CVE-2026-23830

CRITICALNVD 10.010.0
EchelonGraph scoreMEDIUM confidence

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

This critical-severity CVE scores 10.0 under NVD CVSS v3. EPSS exploit probability: 1.2% (68th percentile of EPSS-scored CVEs). No GitHub Security Advisory CVSS is on record for this CVE.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, NVD CVSS v3
Elevated
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: 1.2%CVSS: 10.0Exploit: No code on recordExposed services: Not assessed

A fix is available — apply it.

SandboxJS is a JavaScript sandboxing library. Versions prior to 0.8.26 have a sandbox escape vulnerability due to AsyncFunction not being isolated in SandboxFunction. The library attempts to sandbox code execution by replacing the global Function constructor with a safe, sandboxed version (SandboxFunction). This is handled in utils.ts by mapping Function to sandboxFunction within a map used for lookups. However, before version 0.8.26, the library did not include mappings for AsyncFunction, GeneratorFunction, and AsyncGeneratorFunction. These constructors are not global properties but can be accessed via the .constructor property of an instance (e.g., (async () => {}).constructor). In executor.ts, property access is handled. When code running inside the sandbox accesses .constructor on an async function (which the sandbox allows creating), the executor retrieves the property value. Since AsyncFunction was not in the safe-replacement map, the executor returns the actual native host AsyncFunction constructor. Constructors for functions in JavaScript (like Function, AsyncFunction) create functions that execute in the global scope. By obtaining the host AsyncFunction constructor, an attacker can create a new async function that executes entirely outside the sandbox context, bypassing all restrictions and gaining full access to the host environment (Remote Code Execution). Version 0.8.26 patches this vulnerability.

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
1.2%
EPSS %ILE
68th
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

January 28, 2026

Last Modified

June 17, 2026

Advisory Details (2)

Auto-updated Oct 10, 2026
Patch available. Sources: github, github_commit.
GitHub advisoryMentions a patch (unverified)

Sandbox Escape · Advisory · nyariv/SandboxJS · GitHub

https://github.com/nyariv/SandboxJS/security/advisories/GHSA-wxhw-j4hc-fmq6
GitHub commit Patch Available

commit 345aee6566e4 (nyariv/SandboxJS)

Patch available: nyariv/SandboxJS v0.8.32 (contains commit 345aee6566e4)

https://github.com/nyariv/SandboxJS/commit/345aee6566e47979dee5c337b925b141e7f78ccd

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
@nyariv/sandboxjs—
  • every version up to 0.8.26: fixed in 0.8.26
—

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 15× in last 7d / 33× 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 93 of 183 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. 7 repeat rows among the latest 100 are merged into the row they repeat. The 90 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-16 16:41 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  2. 2026-10-16 12:57 UTCEG score recompute
  3. 2026-10-15 16:31 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  4. 2026-10-15 15:05 UTCEG score recompute
  5. 2026-10-14 16:32 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  6. 2026-10-14 09:32 UTCEG score recompute
  7. 2026-10-13 16:33 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  8. 2026-10-13 07:07 UTCEG score recompute
  9. 2026-10-12 16:33 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  10. 2026-10-12 16:20 UTCEG score recompute
  11. 2026-10-11 20:02 UTCEG score recompute
  12. 2026-10-11 17:16 UTCEG score recompute
  13. 2026-10-11 14:47 UTCEG score recompute
  14. 2026-10-11 13:48 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  15. 2026-10-10 20:00 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  16. 2026-10-09 20:07 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  17. 2026-10-09 09:58 UTCOSV refresh
  18. 2026-10-08 17:11 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  19. 2026-10-07 23:47 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  20. 2026-10-06 15:17 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  21. 2026-10-05 17:42 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  22. 2026-10-04 23:21 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  23. 2026-10-01 19:49 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  24. 2026-09-30 15:03 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  25. 2026-09-29 15:21 UTCEPSS rescoreEPSS 1.2% · 68th percentile
Show 68 more
  1. 2026-09-28 13:51 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  2. 2026-09-27 13:47 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  3. 2026-09-26 15:58 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  4. 2026-09-26 00:26 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  5. 2026-09-24 14:03 UTCEPSS rescoreEPSS 1.2% · 68th percentile
  6. 2026-09-20 20:15 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  7. 2026-09-19 17:03 UTCOSV refresh
  8. 2026-09-18 19:27 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  9. 2026-09-16 14:07 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  10. 2026-09-16 05:15 UTCEPSS rescoreEPSS 1.2% · 65th percentile
  11. 2026-09-13 16:47 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  12. 2026-09-12 15:01 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  13. 2026-09-11 14:52 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  14. 2026-09-10 09:34 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  15. 2026-09-08 22:00 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  16. 2026-09-07 16:01 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  17. 2026-09-06 13:47 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  18. 2026-09-04 05:06 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  19. 2026-09-02 14:11 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  20. 2026-09-01 13:53 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  21. 2026-09-01 04:39 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  22. 2026-08-31 20:34 UTCOSV refresh
  23. 2026-08-30 19:17 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  24. 2026-08-30 01:22 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  25. 2026-08-28 21:41 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  26. 2026-08-27 14:25 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  27. 2026-08-26 14:46 UTCEPSS rescoreEPSS 1.1% · 64th percentile
  28. 2026-08-25 13:48 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  29. 2026-08-21 23:49 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  30. 2026-08-20 22:55 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  31. 2026-08-19 17:03 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  32. 2026-08-18 13:48 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  33. 2026-08-17 13:47 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  34. 2026-08-16 14:56 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  35. 2026-08-16 02:14 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  36. 2026-08-15 01:30 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  37. 2026-08-14 12:08 UTCEG score recompute
  38. 2026-08-13 22:00 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  39. 2026-08-13 04:12 UTCEG score recompute
  40. 2026-08-12 13:50 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  41. 2026-08-11 13:42 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  42. 2026-08-11 00:00 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  43. 2026-08-09 17:07 UTCEG score recompute
  44. 2026-08-09 13:46 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  45. 2026-08-08 16:37 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  46. 2026-08-07 23:22 UTCEG score recompute
  47. 2026-08-06 13:46 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  48. 2026-08-06 04:51 UTCEG score recompute
  49. 2026-08-05 19:17 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  50. 2026-08-04 15:10 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  51. 2026-08-04 10:38 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  52. 2026-08-03 10:35 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  53. 2026-08-02 22:00 UTCEG score recompute
  54. 2026-08-02 02:26 UTCEPSS rescoreEPSS 1.1% · 63rd percentile
  55. 2026-08-01 04:15 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  56. 2026-07-31 11:42 UTCOSV refresh
  57. 2026-07-30 01:30 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  58. 2026-07-27 14:13 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  59. 2026-07-26 14:54 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  60. 2026-07-25 14:17 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  61. 2026-07-24 14:17 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  62. 2026-07-23 14:18 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  63. 2026-07-23 03:07 UTCEG score recompute
  64. 2026-07-22 14:08 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  65. 2026-07-21 15:24 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  66. 2026-07-20 17:08 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  67. 2026-07-19 14:31 UTCEPSS rescoreEPSS 1.1% · 62nd percentile
  68. 2026-07-19 02:28 UTCEPSS rescoreEPSS 1.1% · 62nd percentile

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-23830?
CVE-2026-23830 is a critical-severity vulnerability; its CVE record was published on January 28, 2026. SandboxJS is a JavaScript sandboxing library. Versions prior to 0.8.26 have a sandbox escape vulnerability due to AsyncFunction not being isolated in SandboxFunction. The library attempts to sandbox code execution by replacing the global Function constructor with a safe, sandboxed version…
When was the CVE record for CVE-2026-23830 published?
The CVE record for CVE-2026-23830 was published on January 28, 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 June 17, 2026; the record at its source may have been updated since.
Is CVE-2026-23830 actively exploited?
CVE-2026-23830 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.2% probability of exploitation in the next 30 days (68th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-23830?
CVE-2026-23830 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-23830?
A fix for CVE-2026-23830 is available: update to the fixed version the vendor names in its advisory.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-23830

Explore →

Is Your Infrastructure Affected by CVE-2026-23830?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs