CVE-2026-43940

HIGHNVD 8.48.4—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.4 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 94% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
8.4EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.2%CVSS: 8.4Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

electerm is an open-sourced terminal/ssh/sftp/telnet/serialport/RDP/VNC/Spice/ftp client. Prior to version 3.7.16, the runWidget function in src/app/widgets/load-widget.js constructs a file path by directly concatenating user‑supplied widget identifiers without any sanitisation. Because runWidget is exposed to the renderer process via an asynchronous IPC handler with no input validation, an attacker who achieves JavaScript execution inside the renderer (for example, through a malicious plugin or a cross‑site scripting flaw in the built‑in webview) can abuse a path traversal (../) to load and execute an arbitrary JavaScript file anywhere on the victim’s filesystem. This gives the attacker local code execution with the full privileges of the electerm process, leading to complete system compromise. This issue has been patched in version 3.7.16.

CVSS v3
8.4
EG Score
8.4HIGHmedium confidence
EG Risk
38
EG Risk 38/100

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
Severity84% × 45%
Exploitation0% × 40%
Automatability0% × 15%
EPSS PROB
0.2%
EPSS %ILE
11th
KEV
Not listed

Published

May 8, 2026

Last Modified

May 8, 2026

Advisory Details (2)

Auto-updated May 8, 2026
🔬 Proof of concept available. Patch available. Sources: github.
githubMentions a patch (unverified)🟡 PoC Available

Path traversal in electerm runWidget leads to arbitrary code execution · Advisory · electerm/electerm · GitHub

Affected: version >= 3.7.16

https://github.com/electerm/electerm/security/advisories/GHSA-f77v-9vpc-6pjm
generic

Release v3.7.16 · electerm/electerm · GitHub

https://github.com/electerm/electerm/releases/tag/v3.7.16

Affected Packages

(1 across 1 ecosystem)
npm(1)
PackageVulnerable rangeFix by version rangeDependents
electerm—
  • every version up to 3.7.16: fixed in 3.7.16
—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 7× in last 7d / 23× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. 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. Most recent first.

Showing the most recent 100 of 154 total refreshes for this CVE.

  1. 2026-10-09 20:07 UTCEPSS rescore
  2. 2026-10-08 17:12 UTCEPSS rescore
  3. 2026-10-07 23:48 UTCEPSS rescore
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  11. 2026-09-27 13:48 UTCEPSS rescore
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  21. 2026-09-11 15:10 UTCOSV refresh
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  1. 2026-09-07 16:01 UTCEPSS rescore
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  6. 2026-08-30 19:17 UTCEPSS rescore
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  12. 2026-08-23 19:30 UTCEG score recompute
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  18. 2026-08-17 11:59 UTCEG score recompute
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  23. 2026-08-12 16:51 UTCEG score recompute
  24. 2026-08-12 13:51 UTCEPSS rescore
  25. 2026-08-11 15:54 UTCEG score recompute
  26. 2026-08-11 13:43 UTCEPSS rescore
  27. 2026-08-11 01:21 UTCEG score recompute
  28. 2026-08-11 00:00 UTCEPSS rescore
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  40. 2026-08-03 19:35 UTCEG score recompute
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  45. 2026-07-30 16:28 UTCEPSS rescore
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  48. 2026-07-27 14:13 UTCEPSS rescore
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  51. 2026-07-25 14:18 UTCEPSS rescore
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  54. 2026-07-23 03:14 UTCEG score recompute
  55. 2026-07-22 14:08 UTCEPSS rescore
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  60. 2026-07-16 17:03 UTCEPSS rescore
  61. 2026-07-16 09:53 UTCOSV refresh
  62. 2026-07-15 16:57 UTCEPSS rescore
  63. 2026-07-15 02:00 UTCEPSS rescore
  64. 2026-07-13 06:13 UTCEPSS rescore
  65. 2026-07-12 05:46 UTCEPSS rescore
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  67. 2026-07-09 19:10 UTCEPSS rescore
  68. 2026-07-08 15:16 UTCEPSS rescore
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  73. 2026-07-04 06:31 UTCEPSS rescore
  74. 2026-07-01 15:07 UTCEPSS rescore
  75. 2026-06-30 23:22 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2026-43940?
CVE-2026-43940 is a high vulnerability published on May 8, 2026. electerm is an open-sourced terminal/ssh/sftp/telnet/serialport/RDP/VNC/Spice/ftp client. Prior to version 3.7.16, the runWidget function in src/app/widgets/load-widget.js constructs a file path by directly concatenating user‑supplied widget identifiers without any sanitisation. Because runWidget…
When was CVE-2026-43940 disclosed?
CVE-2026-43940 was first published on May 8, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43940 actively exploited?
CVE-2026-43940 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.2% probability of exploitation in the next 30 days (11th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-43940?
CVE-2026-43940 has a CVSS v3 base score of 8.4 (NVD).
How do I remediate CVE-2026-43940?
A fix for CVE-2026-43940 is available: update to the fixed version the vendor names in its advisory.

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