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
8.4
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 8.4Exploit: NoneExposed: 0

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

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
8.4(medium)
EPSS
6.2%
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.
github Patch Available🟡 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 rangeFixed inDependents
electerm—3.7.16—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 6× in last 7d / 39× 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.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:16 UTCEPSS rescore
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  12. 2026-06-28 08:56 UTCEG score recompute
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  1. 2026-06-19 19:25 UTCEPSS rescore
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  4. 2026-06-17 02:32 UTCEG score recompute
  5. 2026-06-16 17:52 UTCEPSS rescore
  6. 2026-06-15 17:49 UTCEPSS rescore
  7. 2026-06-15 05:26 UTCEG score recompute
  8. 2026-06-14 16:27 UTCEG score recompute
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  10. 2026-06-13 23:00 UTCEPSS rescore
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  13. 2026-06-12 20:58 UTCEG score recompute
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  17. 2026-06-11 02:45 UTCEG score recompute
  18. 2026-06-10 22:18 UTCEPSS rescore
  19. 2026-06-10 13:46 UTCEG score recompute
  20. 2026-06-10 13:22 UTCEPSS rescore
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  22. 2026-06-10 00:46 UTCEG score recompute
  23. 2026-06-09 11:47 UTCEG score recompute
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  25. 2026-06-08 14:17 UTCEPSS rescore
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  27. 2026-06-08 09:46 UTCEG score recompute
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  31. 2026-06-07 07:47 UTCEG score recompute
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  35. 2026-06-06 05:48 UTCEG score recompute
  36. 2026-06-05 22:47 UTCEPSS rescore
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  40. 2026-06-05 03:47 UTCEG score recompute
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  44. 2026-06-04 01:47 UTCEG score recompute
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  47. 2026-06-02 20:13 UTCEPSS rescore
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  53. 2026-05-31 22:30 UTCEPSS rescore
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  57. 2026-05-29 13:44 UTCEPSS rescore
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  61. 2026-05-27 13:40 UTCEPSS rescore
  62. 2026-05-27 13:40 UTCEPSS rescore
  63. 2026-05-26 13:44 UTCEPSS rescore
  64. 2026-05-26 07:18 UTCEPSS rescore
  65. 2026-05-23 00:07 UTCEG score recompute
  66. 2026-05-21 22:43 UTCEPSS rescore
  67. 2026-05-20 22:38 UTCEPSS rescore
  68. 2026-05-20 13:49 UTCEG score recompute
  69. 2026-05-20 11:22 UTCEPSS rescore

Related CVEs(same CWE)

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 in the National Vulnerability Database 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 6.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
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?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43940, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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