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) @ resolute2026-09-18ubuntu
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 20× in last 7d / 86× 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 203 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 03:52 UTCEG score recompute
  3. 2026-09-18 03:52 UTCVendor advisory
  4. 2026-09-18 03:52 UTCGHSA enrichment
  5. 2026-09-17 19:31 UTCEPSS rescore
  6. 2026-09-16 14:08 UTCEPSS rescore
  7. 2026-09-16 12:42 UTCEG score recompute
  8. 2026-09-16 12:42 UTCVendor advisory
  9. 2026-09-16 12:42 UTCGHSA enrichment
  10. 2026-09-15 03:11 UTCEPSS rescore
  11. 2026-09-14 11:55 UTCEG score recompute
  12. 2026-09-14 11:55 UTCVendor advisory
  13. 2026-09-14 11:55 UTCGHSA enrichment
  14. 2026-09-13 16:47 UTCEPSS rescore
  15. 2026-09-13 11:31 UTCEG score recompute
  16. 2026-09-13 11:31 UTCVendor advisory
  17. 2026-09-13 11:31 UTCGHSA enrichment
  18. 2026-09-12 09:50 UTCEG score recompute
  19. 2026-09-12 09:50 UTCVendor advisory
  20. 2026-09-12 09:50 UTCGHSA enrichment
  21. 2026-09-11 14:53 UTCEPSS rescore
  22. 2026-09-11 09:13 UTCEG score recompute
  23. 2026-09-11 09:13 UTCVendor advisory
  24. 2026-09-11 09:13 UTCGHSA enrichment
  25. 2026-09-10 09:35 UTCEPSS rescore
Show 75 more
  1. 2026-09-09 11:40 UTCEG score recompute
  2. 2026-09-09 11:40 UTCVendor advisory
  3. 2026-09-09 11:40 UTCGHSA enrichment
  4. 2026-09-08 22:01 UTCEPSS rescore
  5. 2026-09-07 22:44 UTCEG score recompute
  6. 2026-09-07 22:44 UTCVendor advisory
  7. 2026-09-07 22:44 UTCGHSA enrichment
  8. 2026-09-06 13:47 UTCEPSS rescore
  9. 2026-09-06 11:19 UTCEG score recompute
  10. 2026-09-06 11:19 UTCVendor advisory
  11. 2026-09-06 11:19 UTCGHSA enrichment
  12. 2026-09-05 09:13 UTCEG score recompute
  13. 2026-09-05 09:13 UTCVendor advisory
  14. 2026-09-05 09:13 UTCGHSA enrichment
  15. 2026-09-04 05:07 UTCEPSS rescore
  16. 2026-09-02 14:12 UTCEPSS rescore
  17. 2026-09-01 21:28 UTCVendor advisory
  18. 2026-09-01 21:28 UTCGHSA enrichment
  19. 2026-09-01 20:23 UTCVendor advisory
  20. 2026-09-01 20:23 UTCGHSA enrichment
  21. 2026-09-01 19:24 UTCEG score recompute
  22. 2026-09-01 19:24 UTCVendor advisory
  23. 2026-09-01 19:24 UTCGHSA enrichment
  24. 2026-09-01 13:54 UTCEPSS rescore
  25. 2026-09-01 04:40 UTCEPSS rescore
  26. 2026-08-31 02:41 UTCEG score recompute
  27. 2026-08-31 02:41 UTCVendor advisory
  28. 2026-08-31 02:41 UTCGHSA enrichment
  29. 2026-08-30 19:17 UTCEPSS rescore
  30. 2026-08-30 02:23 UTCEG score recompute
  31. 2026-08-30 02:23 UTCVendor advisory
  32. 2026-08-30 02:23 UTCGHSA enrichment
  33. 2026-08-30 01:22 UTCEPSS rescore
  34. 2026-08-28 21:42 UTCEPSS rescore
  35. 2026-08-28 01:40 UTCEG score recompute
  36. 2026-08-28 01:40 UTCVendor advisory
  37. 2026-08-28 01:40 UTCGHSA enrichment
  38. 2026-08-27 14:25 UTCEPSS rescore
  39. 2026-08-27 01:17 UTCEG score recompute
  40. 2026-08-27 01:17 UTCVendor advisory
  41. 2026-08-27 01:17 UTCGHSA enrichment
  42. 2026-08-26 14:46 UTCEPSS rescore
  43. 2026-08-26 00:59 UTCVendor advisory
  44. 2026-08-26 00:58 UTCGHSA enrichment
  45. 2026-08-25 00:41 UTCEG score recompute
  46. 2026-08-25 00:41 UTCVendor advisory
  47. 2026-08-25 00:41 UTCGHSA enrichment
  48. 2026-08-24 00:18 UTCEG score recompute
  49. 2026-08-24 00:18 UTCVendor advisory
  50. 2026-08-24 00:18 UTCGHSA enrichment
  51. 2026-08-23 00:19 UTCEPSS rescore
  52. 2026-08-23 00:01 UTCEG score recompute
  53. 2026-08-23 00:01 UTCVendor advisory
  54. 2026-08-23 00:01 UTCGHSA enrichment
  55. 2026-08-21 23:49 UTCEPSS rescore
  56. 2026-08-21 23:43 UTCVendor advisory
  57. 2026-08-21 23:43 UTCGHSA enrichment
  58. 2026-08-20 23:25 UTCEG score recompute
  59. 2026-08-20 23:25 UTCVendor advisory
  60. 2026-08-20 23:25 UTCGHSA enrichment
  61. 2026-08-20 22:55 UTCEPSS rescore
  62. 2026-08-19 23:08 UTCEG score recompute
  63. 2026-08-19 23:08 UTCVendor advisory
  64. 2026-08-19 23:08 UTCGHSA enrichment
  65. 2026-08-19 17:04 UTCEPSS rescore
  66. 2026-08-18 22:50 UTCEG score recompute
  67. 2026-08-18 22:50 UTCVendor advisory
  68. 2026-08-18 22:50 UTCGHSA enrichment
  69. 2026-08-18 13:48 UTCEPSS rescore
  70. 2026-08-17 22:25 UTCVendor advisory
  71. 2026-08-17 22:25 UTCGHSA enrichment
  72. 2026-08-17 22:00 UTCVendor advisory
  73. 2026-08-17 22:00 UTCGHSA enrichment
  74. 2026-08-17 20:59 UTCEG score recompute
  75. 2026-08-17 20:59 UTCVendor advisory

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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