Vulnerability-Lookup

CVE-2026-49253 (GCVE-0-2026-49253)

Vulnerability from cvelistv5 – Published: 2026-08-19 14:31 – Updated: 2026-08-21 19:31

Title

electerm: Path Traversal in Zmodem and Trzsz Download Filename Handling

Summary

electerm is an open-sourced terminal/ssh/sftp/telnet/serialport/RDP/VNC/Spice/ftp client. Prior to 3.11.11, electerm uses remote-supplied filenames directly with path.join() while receiving Zmodem and Trzsz transfers. In src/app/server/zmodem.js, prepareReceiveFile() joins the filename to the user-selected save path, and in src/app/server/trzsz.js, getUniqueFilePath(), the openSaveFile() callback, and the savedFilePaths mapping construct destinations without sanitization. A malicious SSH server or remote shell can provide a filename containing traversal components such as ../escaped.txt or ../../.bashrc. When the victim accepts the transfer and selects a download directory, electerm can write outside that directory and overwrite files accessible to the desktop user, potentially changing sensitive configuration or impairing availability. This issue is fixed in version 3.11.11.

Severity

7.1 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-21 19:31 UTC

CWE

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Assigner

GitHub_M CNA under the mitre root

CNA scorecard C 72/100 over 7634 records in the last 180 days details

References

3 references

URL	Tags
https://github.com/electerm/electerm/security/adv…	x_refsource_CONFIRM
https://github.com/electerm/electerm/commit/fde15…	x_refsource_MISC
https://github.com/electerm/electerm/releases/tag…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
electerm	electerm	Affected: < 3.11.11	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-49253

Vulnerability from fkie_nvd - Published: 2026-08-19 15:17 - Updated: 2026-09-09 21:13

Severity

7.1 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/electerm/electerm/commit/fde153d677a170c5816368f6586647f3af4ef284
	security-advisories@github.com	https://github.com/electerm/electerm/releases/tag/v3.11.11
	security-advisories@github.com	https://github.com/electerm/electerm/security/advisories/GHSA-38j7-23hf-9mhc
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/electerm/electerm/security/advisories/GHSA-38j7-23hf-9mhc

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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  "affected": [
    {
      "affectedData": [
        {
          "product": "electerm",
          "vendor": "electerm",
          "versions": [
            {
              "status": "affected",
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GHSA-38J7-23HF-9MHC

Vulnerability from github – Published: 2026-07-02 19:20 – Updated: 2026-07-02 19:20

Summary

electerm has Path Traversal in Zmodem and Trzsz Download Filename Handling

Details

Impact

A path traversal vulnerability exists in the Zmodem and Trzsz file download handlers in electerm. When receiving files via Zmodem or Trzsz protocols, electerm uses the remote-supplied filename directly in path.join() with the user-selected download directory without sanitization.

A malicious SSH server or remote shell process can send a specially crafted filename such as ../escaped.txt to escape the user-selected download directory and write files to arbitrary locations on the user's filesystem, subject to process permissions.

Attack scenario: 1. User connects to a malicious SSH server 2. Attacker initiates a Zmodem or Trzsz file transfer 3. Attacker supplies a traversal filename (e.g., ../../.bashrc, ../escaped.txt) 4. User accepts the transfer and selects a download directory 5. File is written outside the selected directory, potentially overwriting sensitive files

Affected components: - src/app/server/zmodem.js - prepareReceiveFile() at line 736 - src/app/server/trzsz.js - getUniqueFilePath() at line 559, openSaveFile() callback, and savedFilePaths mapping

Patches

https://github.com/electerm/electerm/commit/fde153d677a170c5816368f6586647f3af4ef284

Workarounds

If upgrading is not immediately possible, users can mitigate this vulnerability by: 1. Only connecting to trusted SSH servers 2. Rejecting or canceling any incoming Zmodem or Trzsz file transfers from untrusted sources 3. Avoiding the use of Zmodem (sz/rz) and Trzsz (trz/tsz) commands on untrusted servers

Severity

7.1 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L

Show details on source website

JSON

To clipboard

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      "package": {
        "ecosystem": "npm",
        "name": "electerm"
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          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
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    "CVE-2026-49253"
  ],
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      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-07-02T19:20:20Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\n\nA path traversal vulnerability exists in the Zmodem and Trzsz file download handlers in electerm. When receiving files via Zmodem or Trzsz protocols, electerm uses the remote-supplied filename directly in `path.join()` with the user-selected download directory without sanitization.\n\nA malicious SSH server or remote shell process can send a specially crafted filename such as `../escaped.txt` to escape the user-selected download directory and write files to arbitrary locations on the user\u0027s filesystem, subject to process permissions.\n\n**Attack scenario:**\n1. User connects to a malicious SSH server\n2. Attacker initiates a Zmodem or Trzsz file transfer\n3. Attacker supplies a traversal filename (e.g., `../../.bashrc`, `../escaped.txt`)\n4. User accepts the transfer and selects a download directory\n5. File is written outside the selected directory, potentially overwriting sensitive files\n\n**Affected components:**\n- `src/app/server/zmodem.js` - `prepareReceiveFile()` at line 736\n- `src/app/server/trzsz.js` - `getUniqueFilePath()` at line 559, `openSaveFile()` callback, and `savedFilePaths` mapping\n\n### Patches\n\n- https://github.com/electerm/electerm/commit/fde153d677a170c5816368f6586647f3af4ef284\n\n### Workarounds\n\n\nIf upgrading is not immediately possible, users can mitigate this vulnerability by:\n1. Only connecting to trusted SSH servers\n2. Rejecting or canceling any incoming Zmodem or Trzsz file transfers from untrusted sources\n3. Avoiding the use of Zmodem (`sz`/`rz`) and Trzsz (`trz`/`tsz`) commands on untrusted servers",
  "id": "GHSA-38j7-23hf-9mhc",
  "modified": "2026-07-02T19:20:20Z",
  "published": "2026-07-02T19:20:20Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/electerm/electerm/security/advisories/GHSA-38j7-23hf-9mhc"
    },
    {
      "type": "WEB",
      "url": "https://github.com/electerm/electerm/commit/fde153d677a170c5816368f6586647f3af4ef284"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/electerm/electerm"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "electerm has Path Traversal in Zmodem and Trzsz Download Filename Handling"
}

Sightings

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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CVE-2026-49253 (GCVE-0-2026-49253)

FKIE_CVE-2026-49253

GHSA-38J7-23HF-9MHC

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