CVE-2026-59849

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.2%, top 84% 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
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in libssh. Logic errors in automatic certificate-based public key authentication can cause libssh clients to loop indefinitely when configured certificates are missing or repeatedly rejected by a server, leading to denial of service.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
34(Track)
EG Risk 34/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
16%
KEV
Not listed

Published

July 21, 2026

Last Modified

August 19, 2026

Advisory Details (3)

Auto-updated Jul 30, 2026
Patch available. Sources: redhat.
redhat Patch Available

2498182 – (CVE-2026-59849) CVE-2026-59849 libssh: libssh: denial of service via automatic certificate authentication loop

https://bugzilla.redhat.com/show_bug.cgi?id=2498182
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-59849
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:42922

Vendor Advisories for CVE-2026-59849(3)

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

Patch Availability(3)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntulibssh-doc (0.11.3-1ubuntu2.1) @ resolute2026-09-11ubuntu
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

(1)

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 25× in last 7d / 139× 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 246 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-59849?
CVE-2026-59849 is a high vulnerability published on July 21, 2026. A flaw was found in libssh. Logic errors in automatic certificate-based public key authentication can cause libssh clients to loop indefinitely when configured certificates are missing or repeatedly rejected by a server, leading to denial of service.
When was CVE-2026-59849 disclosed?
CVE-2026-59849 was first published in the National Vulnerability Database on July 21, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-59849 actively exploited?
CVE-2026-59849 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 84.4% of all scored CVEs.
What is the CVSS score of CVE-2026-59849?
CVE-2026-59849 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-59849?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59849, 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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