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% (34th percentile of EPSS-scored CVEs). 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: 0.4%CVSS: 7.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

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
7.1HIGHmedium confidence
EG Risk
32
EG Risk 32/100CISA SSVC

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%
CISA SSVC: Track at every mission impact level.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
34th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

A fix is available. Apply it within your standard update timelines.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

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 rangeFix by version rangeDependents
SSH.NET2011.12.7 ... 2025.1.0 (32 versions)
  • every version up to 2026.0.0: fixed in 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 / 46× 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. 2026-10-05 14:48 UTCEG score recompute
  2. 2026-10-04 23:22 UTCEPSS rescore
  3. 2026-10-03 20:00 UTCEG score recompute
  4. 2026-10-03 14:25 UTCEPSS rescore
  5. 2026-10-02 22:00 UTCEG score recompute
  6. 2026-10-02 08:21 UTCEG score recompute
  7. 2026-10-01 19:50 UTCEPSS rescore
  8. 2026-09-30 21:56 UTCEG score recompute
  9. 2026-09-30 15:03 UTCEPSS rescore
  10. 2026-09-29 04:50 UTCEG score recompute
  11. 2026-09-28 14:19 UTCEG score recompute
  12. 2026-09-28 13:51 UTCEPSS rescore
  13. 2026-09-28 01:31 UTCEG score recompute
  14. 2026-09-27 13:48 UTCEPSS rescore
  15. 2026-09-27 09:56 UTCEG score recompute
  16. 2026-09-26 15:59 UTCEPSS rescore
  17. 2026-09-26 00:27 UTCEPSS rescore
  18. 2026-09-25 03:42 UTCEG score recompute
  19. 2026-09-24 00:13 UTCEG score recompute
  20. 2026-09-23 17:53 UTCEPSS rescore
  21. 2026-09-22 22:42 UTCEG score recompute
  22. 2026-09-22 10:00 UTCEG score recompute
  23. 2026-09-21 06:27 UTCEG score recompute
  24. 2026-09-20 20:16 UTCEPSS rescore
  25. 2026-09-20 00:10 UTCEG score recompute
Show 55 more
  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
  26. 2026-09-02 14:12 UTCEPSS rescore
  27. 2026-09-02 01:55 UTCEG score recompute
  28. 2026-09-01 13:54 UTCEPSS rescore
  29. 2026-09-01 13:14 UTCEG score recompute
  30. 2026-09-01 04:40 UTCEPSS rescore
  31. 2026-08-30 22:42 UTCEG score recompute
  32. 2026-08-30 19:17 UTCEPSS rescore
  33. 2026-08-30 10:01 UTCEG score recompute
  34. 2026-08-30 01:22 UTCEPSS rescore
  35. 2026-08-29 08:38 UTCEG score recompute
  36. 2026-08-28 21:41 UTCEPSS rescore
  37. 2026-08-27 19:37 UTCEG score recompute
  38. 2026-08-27 14:25 UTCEPSS rescore
  39. 2026-08-26 16:28 UTCEG score recompute
  40. 2026-08-26 14:46 UTCEPSS rescore
  41. 2026-08-25 14:16 UTCEG score recompute
  42. 2026-08-25 13:49 UTCEPSS rescore
  43. 2026-08-25 01:32 UTCEG score recompute
  44. 2026-08-24 12:51 UTCEG score recompute
  45. 2026-08-23 11:28 UTCEG score recompute
  46. 2026-08-23 00:19 UTCEPSS rescore
  47. 2026-08-22 10:06 UTCEG score recompute
  48. 2026-08-21 23:49 UTCEPSS rescore
  49. 2026-08-21 08:41 UTCEG score recompute
  50. 2026-08-20 22:55 UTCEPSS rescore
  51. 2026-08-19 18:37 UTCEG score recompute
  52. 2026-08-19 17:04 UTCEPSS rescore
  53. 2026-08-18 16:47 UTCEG score recompute
  54. 2026-08-18 15:33 UTCEG score recompute
  55. 2026-08-12 15:21 UTCEG score recompute

Related CVEs(same product + 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 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 0.4% probability of exploitation in the next 30 days (34th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-48798?
CVE-2026-48798 has a CVSS base score of 7.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-48798?
A fix for CVE-2026-48798 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-48798 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2026-48798

Explore →

Is Your Infrastructure Affected by CVE-2026-48798?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Book a Demo →Browse All CVEs