CVE-2026-49253

HIGHPre-NVD 7.17.1
EchelonGraph scoreLOW confidence

This high-severity CVE scores 7.1 under the CNA's CVSS (NVD's own analysis pending). EPSS exploit-prediction score not yet available (the EPSS model rescores nightly; freshly-published CVEs typically appear within 48 hours). 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: cna:github_m
7.1
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: —CVSS: 7.1Exploit: NoneExposed: 0

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

electerm has Path Traversal in Zmodem and Trzsz Download Filename Handling

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:

  • User connects to a malicious SSH server
  • Attacker initiates a Zmodem or Trzsz file transfer
  • Attacker supplies a traversal filename (e.g., ../../.bashrc, ../escaped.txt)
  • User accepts the transfer and selects a download directory
  • 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:

  • Only connecting to trusted SSH servers
  • Rejecting or canceling any incoming Zmodem or Trzsz file transfers from untrusted sources
  • Avoiding the use of Zmodem (sz/rz) and Trzsz (trz/tsz) commands on untrusted servers

CVSS v3
7.1
EG Score
7.1(low)
EPSS
—
KEV
Not listed

Published

July 2, 2026

Last Modified

July 2, 2026

Vendor Advisories for CVE-2026-49253(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 9× 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. 2026-07-06 18:10 UTCEG score recompute
  2. 2026-07-06 06:24 UTCEG score recompute
  3. 2026-07-05 18:40 UTCEG score recompute
  4. 2026-07-05 06:56 UTCEG score recompute
  5. 2026-07-04 19:11 UTCEG score recompute
  6. 2026-07-04 07:25 UTCEG score recompute
  7. 2026-07-03 19:37 UTCEG score recompute
  8. 2026-07-03 07:53 UTCEG score recompute
  9. 2026-07-02 20:07 UTCEG score recompute

Frequently asked(4)

What is CVE-2026-49253?
CVE-2026-49253 is a high vulnerability published on July 2, 2026. electerm has Path Traversal in Zmodem and Trzsz Download Filename Handling 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()…
When was CVE-2026-49253 disclosed?
CVE-2026-49253 was first published in the National Vulnerability Database on July 2, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
What is the CVSS score of CVE-2026-49253?
CVE-2026-49253 has a CVSS v4.0 base score of 7.1 (CNA self-assessment; NVD's own analysis pending). The EG score is currently aggregating — additional source signals are being incorporated as they become available..
How do I remediate CVE-2026-49253?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-49253, 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.

Dependency Blast Radius

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