CVE-2026-48798

HIGHPre-NVD 7.17.1—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.1 under a secondary CVSS source (NVD's own analysis pending). EPSS exploit probability: 0.4%, top 68% 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, secondary
7.1EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.1Exploit: None knownExposed: 0

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

SSH.NET is a Secure Shell (SSH) library for .NET. In 2025.1.0 and earlier, ScpClient.Download(string directoryName, DirectoryInfo directoryInfo) trusts file and directory names returned by a remote SCP server and combines them with the requested local directory without containment validation, allowing a malicious, compromised, or man-in-the-middle server to use ../ sequences or absolute paths to create or overwrite files anywhere writable by the client process. This issue is fixed in version 2026.0.0.

CVSS v3
7.1
EG Score
7.1(medium)
EG Risk
32(Track)
EG Risk 32/100SSVC: Track

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
Severity71% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
32%
KEV
Not listed

Published

August 12, 2026

Last Modified

September 18, 2026

Advisory Details (3)

Auto-updated Aug 18, 2026
Patch available. Sources: github_commit, github_release, github.
github Patch Available

ScpClient recursive download allows arbitrary file write via server-controlled SCP filenames · Advisory · sshnet/SSH.NET · GitHub

https://github.com/sshnet/SSH.NET/security/advisories/GHSA-q939-rpr3-3284
github_release Patch Available

2026.0.0

Patch available: sshnet/SSH.NET 2026.0.0

https://github.com/sshnet/SSH.NET/releases/tag/2026.0.0
github_commit Patch Available

commit 600be0de5437 (sshnet/SSH.NET)

Patch available: sshnet/SSH.NET 2026.0.0 (contains commit 600be0de5437)

https://github.com/sshnet/SSH.NET/commit/600be0de543765995a189b5d7cd4efac5007f3ce

Vendor Advisories for CVE-2026-48798(1)

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

Affected Packages

(1 across 1 ecosystem)
NuGet(1)
PackageVulnerable rangeFixed inDependents
SSH.NET2011.12.7 ... 2025.1.0 (32 versions)2026.0.0—

Weakness Classification(2)

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

Data Freshness Timeline

(refreshed 10× in last 7d / 50× 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. 2026-09-18 20:11 UTCEG score recompute
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-18 02:27 UTCEG score recompute
  4. 2026-09-17 00:22 UTCEG score recompute
  5. 2026-09-16 14:08 UTCEPSS rescore
  6. 2026-09-16 05:15 UTCEPSS rescore
  7. 2026-09-15 14:20 UTCEG score recompute
  8. 2026-09-13 23:43 UTCEG score recompute
  9. 2026-09-13 16:47 UTCEPSS rescore
  10. 2026-09-12 22:20 UTCEG score recompute
  11. 2026-09-11 20:56 UTCEG score recompute
  12. 2026-09-11 14:53 UTCEPSS rescore
  13. 2026-09-10 19:32 UTCEG score recompute
  14. 2026-09-10 09:35 UTCEPSS rescore
  15. 2026-09-09 05:17 UTCEG score recompute
  16. 2026-09-08 22:01 UTCEPSS rescore
  17. 2026-09-07 18:35 UTCEG score recompute
  18. 2026-09-07 16:01 UTCEPSS rescore
  19. 2026-09-06 15:47 UTCEG score recompute
  20. 2026-09-06 13:47 UTCEPSS rescore
  21. 2026-09-06 03:05 UTCEG score recompute
  22. 2026-09-05 00:44 UTCEG score recompute
  23. 2026-09-04 07:55 UTCEG score recompute
  24. 2026-09-04 05:06 UTCEPSS rescore
  25. 2026-09-02 23:38 UTCEG score recompute
Show 30 more
  1. 2026-09-02 14:12 UTCEPSS rescore
  2. 2026-09-02 01:55 UTCEG score recompute
  3. 2026-09-01 13:54 UTCEPSS rescore
  4. 2026-09-01 13:14 UTCEG score recompute
  5. 2026-09-01 04:40 UTCEPSS rescore
  6. 2026-08-30 22:42 UTCEG score recompute
  7. 2026-08-30 19:17 UTCEPSS rescore
  8. 2026-08-30 10:01 UTCEG score recompute
  9. 2026-08-30 01:22 UTCEPSS rescore
  10. 2026-08-29 08:38 UTCEG score recompute
  11. 2026-08-28 21:41 UTCEPSS rescore
  12. 2026-08-27 19:37 UTCEG score recompute
  13. 2026-08-27 14:25 UTCEPSS rescore
  14. 2026-08-26 16:28 UTCEG score recompute
  15. 2026-08-26 14:46 UTCEPSS rescore
  16. 2026-08-25 14:16 UTCEG score recompute
  17. 2026-08-25 13:49 UTCEPSS rescore
  18. 2026-08-25 01:32 UTCEG score recompute
  19. 2026-08-24 12:51 UTCEG score recompute
  20. 2026-08-23 11:28 UTCEG score recompute
  21. 2026-08-23 00:19 UTCEPSS rescore
  22. 2026-08-22 10:06 UTCEG score recompute
  23. 2026-08-21 23:49 UTCEPSS rescore
  24. 2026-08-21 08:41 UTCEG score recompute
  25. 2026-08-20 22:55 UTCEPSS rescore
  26. 2026-08-19 18:37 UTCEG score recompute
  27. 2026-08-19 17:04 UTCEPSS rescore
  28. 2026-08-18 16:47 UTCEG score recompute
  29. 2026-08-18 15:33 UTCEG score recompute
  30. 2026-08-12 15:21 UTCEG score recompute

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-48798?
CVE-2026-48798 is a high vulnerability published on August 12, 2026. SSH.NET is a Secure Shell (SSH) library for .NET. In 2025.1.0 and earlier, ScpClient.Download(string directoryName, DirectoryInfo directoryInfo) trusts file and directory names returned by a remote SCP server and combines them with the requested local directory without containment validation,…
When was CVE-2026-48798 disclosed?
CVE-2026-48798 was first published in the National Vulnerability Database on August 12, 2026, with the most recent update on September 18, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-48798 actively exploited?
CVE-2026-48798 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 68.1% of all scored CVEs.
What is the CVSS score of CVE-2026-48798?
CVE-2026-48798 has a CVSS v3 base score of 7.1 (NVD).
How do I remediate CVE-2026-48798?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-48798, 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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