CVE-2026-59845

MEDIUMNVD 5.95.9—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.9 under NVD CVSS v3. EPSS exploit probability: 0.1%, top 99% of all CVEs by exploit prediction. GitHub Security Advisory enrichment pending alignment with NVD CVSS.

Triggered by: NVD CVSS baseline
Sources: epss, ghsa, nvd
Trending — 4 sources updated this week
5.9EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.9Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.

CVSS v3
5.9
EG Score
5.9(medium)
EG Risk
27(Track)
EG Risk 27/100SSVC: 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
Severity59% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

July 21, 2026

Last Modified

September 1, 2026

Advisory Details (2)

Auto-updated Jul 21, 2026
Patch available. Sources: redhat.
redhat

2498178 – (CVE-2026-59845) CVE-2026-59845 libssh: libssh: denial of service via unchecked ProxyCommand fork() failure

https://bugzilla.redhat.com/show_bug.cgi?id=2498178
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-59845

Vendor Advisories for CVE-2026-59845(5)

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

Patch Availability(5)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibssh-doc (0.11.3-1ubuntu2.1) @ resolute2026-09-11ubuntu
redhatlibssh-0:0.10.4-19.el9_82026-09-01redhat
redhatlibssh-0:0.9.6-17.el8_102026-09-01redhat
redhatlibssh-0:0.12.0-3.el10_22026-08-17redhat
redhatlibssh-main-0.12.1-4.hum12026-07-21redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libssh0.10.4-1 ... 0.9.8-0+deb11u2 (25 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libssh0.10.5-2 ... 0.12.2-1 (17 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libssh0.11.2-1, 0.11.2-1+deb13u1, 0.11.3-10.11.5-0+deb13u1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libssh0.11.2-1, 0.11.3-1, 0.12.0-1, 0.12.0-2, 0.12.0-30.12.1-1—

Weakness Classification(1)

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

Additional Vendor Advisories

(2)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 19× in last 7d / 97× 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.

Showing the most recent 100 of 183 total refreshes for this CVE.

  1. 2026-09-11 14:53 UTCEPSS rescore
  2. 2026-09-11 09:13 UTCEG score recompute
  3. 2026-09-11 09:13 UTCVendor advisory
  4. 2026-09-11 09:13 UTCGHSA enrichment
  5. 2026-09-10 09:35 UTCEPSS rescore
  6. 2026-09-09 11:40 UTCEG score recompute
  7. 2026-09-09 11:40 UTCVendor advisory
  8. 2026-09-09 11:40 UTCGHSA enrichment
  9. 2026-09-08 22:01 UTCEPSS rescore
  10. 2026-09-07 22:44 UTCEG score recompute
  11. 2026-09-07 22:44 UTCVendor advisory
  12. 2026-09-07 22:44 UTCGHSA enrichment
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-06 11:19 UTCEG score recompute
  15. 2026-09-06 11:19 UTCVendor advisory
  16. 2026-09-06 11:19 UTCGHSA enrichment
  17. 2026-09-05 09:13 UTCEG score recompute
  18. 2026-09-05 09:13 UTCVendor advisory
  19. 2026-09-05 09:13 UTCGHSA enrichment
  20. 2026-09-04 05:07 UTCEPSS rescore
  21. 2026-09-02 14:12 UTCEPSS rescore
  22. 2026-09-01 21:28 UTCVendor advisory
  23. 2026-09-01 21:28 UTCGHSA enrichment
  24. 2026-09-01 20:23 UTCVendor advisory
  25. 2026-09-01 20:23 UTCGHSA enrichment
Show 75 more
  1. 2026-09-01 19:24 UTCEG score recompute
  2. 2026-09-01 19:24 UTCVendor advisory
  3. 2026-09-01 19:24 UTCGHSA enrichment
  4. 2026-09-01 13:54 UTCEPSS rescore
  5. 2026-09-01 04:40 UTCEPSS rescore
  6. 2026-08-31 02:41 UTCEG score recompute
  7. 2026-08-31 02:41 UTCVendor advisory
  8. 2026-08-31 02:41 UTCGHSA enrichment
  9. 2026-08-30 19:17 UTCEPSS rescore
  10. 2026-08-30 02:23 UTCEG score recompute
  11. 2026-08-30 02:23 UTCVendor advisory
  12. 2026-08-30 02:23 UTCGHSA enrichment
  13. 2026-08-30 01:22 UTCEPSS rescore
  14. 2026-08-28 21:42 UTCEPSS rescore
  15. 2026-08-28 01:40 UTCEG score recompute
  16. 2026-08-28 01:40 UTCVendor advisory
  17. 2026-08-28 01:40 UTCGHSA enrichment
  18. 2026-08-27 14:25 UTCEPSS rescore
  19. 2026-08-27 01:17 UTCEG score recompute
  20. 2026-08-27 01:17 UTCVendor advisory
  21. 2026-08-27 01:17 UTCGHSA enrichment
  22. 2026-08-26 14:46 UTCEPSS rescore
  23. 2026-08-26 00:59 UTCVendor advisory
  24. 2026-08-26 00:58 UTCGHSA enrichment
  25. 2026-08-25 00:41 UTCEG score recompute
  26. 2026-08-25 00:41 UTCVendor advisory
  27. 2026-08-25 00:41 UTCGHSA enrichment
  28. 2026-08-24 00:18 UTCEG score recompute
  29. 2026-08-24 00:18 UTCVendor advisory
  30. 2026-08-24 00:18 UTCGHSA enrichment
  31. 2026-08-23 00:19 UTCEPSS rescore
  32. 2026-08-23 00:01 UTCEG score recompute
  33. 2026-08-23 00:01 UTCVendor advisory
  34. 2026-08-23 00:01 UTCGHSA enrichment
  35. 2026-08-21 23:49 UTCEPSS rescore
  36. 2026-08-21 23:43 UTCVendor advisory
  37. 2026-08-21 23:43 UTCGHSA enrichment
  38. 2026-08-20 23:25 UTCEG score recompute
  39. 2026-08-20 23:25 UTCVendor advisory
  40. 2026-08-20 23:25 UTCGHSA enrichment
  41. 2026-08-20 22:55 UTCEPSS rescore
  42. 2026-08-19 23:08 UTCEG score recompute
  43. 2026-08-19 23:08 UTCVendor advisory
  44. 2026-08-19 23:08 UTCGHSA enrichment
  45. 2026-08-19 17:04 UTCEPSS rescore
  46. 2026-08-18 22:50 UTCEG score recompute
  47. 2026-08-18 22:50 UTCVendor advisory
  48. 2026-08-18 22:50 UTCGHSA enrichment
  49. 2026-08-18 13:48 UTCEPSS rescore
  50. 2026-08-17 22:25 UTCVendor advisory
  51. 2026-08-17 22:25 UTCGHSA enrichment
  52. 2026-08-17 22:00 UTCVendor advisory
  53. 2026-08-17 22:00 UTCGHSA enrichment
  54. 2026-08-17 20:59 UTCEG score recompute
  55. 2026-08-17 20:59 UTCVendor advisory
  56. 2026-08-17 20:59 UTCGHSA enrichment
  57. 2026-08-17 13:47 UTCEPSS rescore
  58. 2026-08-16 18:00 UTCEG score recompute
  59. 2026-08-16 18:00 UTCVendor advisory
  60. 2026-08-16 18:00 UTCGHSA enrichment
  61. 2026-08-16 14:56 UTCEPSS rescore
  62. 2026-08-16 02:14 UTCEPSS rescore
  63. 2026-08-15 17:43 UTCEG score recompute
  64. 2026-08-15 17:43 UTCVendor advisory
  65. 2026-08-15 17:43 UTCGHSA enrichment
  66. 2026-08-15 01:30 UTCEPSS rescore
  67. 2026-08-14 17:25 UTCEG score recompute
  68. 2026-08-14 17:25 UTCVendor advisory
  69. 2026-08-14 17:25 UTCGHSA enrichment
  70. 2026-08-13 22:00 UTCEPSS rescore
  71. 2026-08-13 17:08 UTCVendor advisory
  72. 2026-08-13 17:08 UTCGHSA enrichment
  73. 2026-08-12 16:51 UTCEG score recompute
  74. 2026-08-12 16:51 UTCVendor advisory
  75. 2026-08-12 16:51 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-59845?
CVE-2026-59845 is a medium vulnerability published on July 21, 2026. A flaw was found in libssh. When ProxyCommand is used, an unchecked fork() failure can be stored as process ID -1; during cleanup, signals may then be sent across the caller's accessible process tree, leading to local denial of service.
When was CVE-2026-59845 disclosed?
CVE-2026-59845 was first published in the National Vulnerability Database on July 21, 2026, with the most recent update on September 1, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59845 actively exploited?
CVE-2026-59845 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 98.9% of all scored CVEs.
What is the CVSS score of CVE-2026-59845?
CVE-2026-59845 has a CVSS v3 base score of 5.9 (NVD).
How do I remediate CVE-2026-59845?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59845, 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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