CVE-2026-59842

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.4%, top 66% 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
5.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.3Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in libssh. During server-side GSSAPI key exchange, a client-supplied Curve25519 public key shorter than the expected length is copied without proper length validation, leading to an out-of-bounds heap read. This could allow a remote unauthenticated attacker to disclose small amounts of server memory.

CVSS v3
5.3
EG Score
5.3(medium)
EG Risk
24(Track)
EG Risk 24/100SSVC: 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
Severity53% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
34%
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

2498168 – (CVE-2026-59842) CVE-2026-59842 libssh: libssh: information disclosure via short GSSAPI Curve25519 public key

https://bugzilla.redhat.com/show_bug.cgi?id=2498168
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-59842
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:42922

Vendor Advisories for CVE-2026-59842(3)

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

Patch Availability(2)

Vendor / EcosystemFixed in / PatchReleasedSource
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

(1 across 1 ecosystem)
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.

Data Freshness Timeline

(refreshed 20× in last 7d / 98× 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 179 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. 2026-09-07 16:01 UTCEPSS rescore
  14. 2026-09-06 13:47 UTCEPSS rescore
  15. 2026-09-06 11:19 UTCEG score recompute
  16. 2026-09-06 11:19 UTCVendor advisory
  17. 2026-09-06 11:19 UTCGHSA enrichment
  18. 2026-09-05 09:14 UTCEG score recompute
  19. 2026-09-05 09:14 UTCVendor advisory
  20. 2026-09-05 09:14 UTCGHSA enrichment
  21. 2026-09-04 05:07 UTCEPSS rescore
  22. 2026-09-02 14:12 UTCEPSS rescore
  23. 2026-09-02 00:59 UTCEG score recompute
  24. 2026-09-02 00:59 UTCVendor advisory
  25. 2026-09-02 00:59 UTCGHSA enrichment
Show 75 more
  1. 2026-09-01 13:54 UTCEPSS rescore
  2. 2026-09-01 04:40 UTCEPSS rescore
  3. 2026-08-31 02:07 UTCEG score recompute
  4. 2026-08-31 02:07 UTCVendor advisory
  5. 2026-08-31 02:07 UTCGHSA enrichment
  6. 2026-08-30 19:17 UTCEPSS rescore
  7. 2026-08-30 02:25 UTCEG score recompute
  8. 2026-08-30 02:25 UTCVendor advisory
  9. 2026-08-30 02:24 UTCGHSA enrichment
  10. 2026-08-30 01:22 UTCEPSS rescore
  11. 2026-08-28 21:42 UTCEPSS rescore
  12. 2026-08-28 02:52 UTCEG score recompute
  13. 2026-08-28 02:52 UTCVendor advisory
  14. 2026-08-28 02:52 UTCGHSA enrichment
  15. 2026-08-27 14:25 UTCEPSS rescore
  16. 2026-08-27 03:08 UTCEG score recompute
  17. 2026-08-27 03:08 UTCVendor advisory
  18. 2026-08-27 03:08 UTCGHSA enrichment
  19. 2026-08-26 14:46 UTCEPSS rescore
  20. 2026-08-26 03:26 UTCEG score recompute
  21. 2026-08-26 03:26 UTCVendor advisory
  22. 2026-08-26 03:26 UTCGHSA enrichment
  23. 2026-08-25 13:49 UTCEPSS rescore
  24. 2026-08-25 03:35 UTCEG score recompute
  25. 2026-08-25 03:35 UTCVendor advisory
  26. 2026-08-25 03:35 UTCGHSA enrichment
  27. 2026-08-24 03:53 UTCVendor advisory
  28. 2026-08-24 03:53 UTCGHSA enrichment
  29. 2026-08-23 04:11 UTCEG score recompute
  30. 2026-08-23 04:11 UTCVendor advisory
  31. 2026-08-23 04:11 UTCGHSA enrichment
  32. 2026-08-23 00:19 UTCEPSS rescore
  33. 2026-08-22 04:28 UTCEG score recompute
  34. 2026-08-22 04:28 UTCVendor advisory
  35. 2026-08-22 04:28 UTCGHSA enrichment
  36. 2026-08-21 23:49 UTCEPSS rescore
  37. 2026-08-21 04:44 UTCEG score recompute
  38. 2026-08-21 04:44 UTCVendor advisory
  39. 2026-08-21 04:44 UTCGHSA enrichment
  40. 2026-08-20 22:55 UTCEPSS rescore
  41. 2026-08-20 05:02 UTCEG score recompute
  42. 2026-08-20 05:02 UTCVendor advisory
  43. 2026-08-20 05:02 UTCGHSA enrichment
  44. 2026-08-19 17:04 UTCEPSS rescore
  45. 2026-08-19 05:19 UTCVendor advisory
  46. 2026-08-19 05:19 UTCGHSA enrichment
  47. 2026-08-19 05:08 UTCEG score recompute
  48. 2026-08-19 05:08 UTCVendor advisory
  49. 2026-08-19 05:07 UTCGHSA enrichment
  50. 2026-08-18 13:48 UTCEPSS rescore
  51. 2026-08-18 11:19 UTCEG score recompute
  52. 2026-08-18 11:19 UTCVendor advisory
  53. 2026-08-18 11:18 UTCGHSA enrichment
  54. 2026-08-17 13:47 UTCEPSS rescore
  55. 2026-08-17 11:26 UTCEG score recompute
  56. 2026-08-17 11:26 UTCVendor advisory
  57. 2026-08-17 11:26 UTCGHSA enrichment
  58. 2026-08-16 14:56 UTCEPSS rescore
  59. 2026-08-16 11:44 UTCEG score recompute
  60. 2026-08-16 11:44 UTCVendor advisory
  61. 2026-08-16 11:44 UTCGHSA enrichment
  62. 2026-08-16 02:14 UTCEPSS rescore
  63. 2026-08-15 12:03 UTCEG score recompute
  64. 2026-08-15 12:03 UTCVendor advisory
  65. 2026-08-15 12:03 UTCGHSA enrichment
  66. 2026-08-15 01:30 UTCEPSS rescore
  67. 2026-08-14 12:20 UTCEG score recompute
  68. 2026-08-14 12:20 UTCVendor advisory
  69. 2026-08-14 12:20 UTCGHSA enrichment
  70. 2026-08-13 22:00 UTCEPSS rescore
  71. 2026-08-13 12:38 UTCEG score recompute
  72. 2026-08-13 12:38 UTCVendor advisory
  73. 2026-08-13 12:38 UTCGHSA enrichment
  74. 2026-08-12 13:51 UTCEPSS rescore
  75. 2026-08-12 12:56 UTCEG score recompute

Frequently asked(5)

What is CVE-2026-59842?
CVE-2026-59842 is a medium vulnerability published on July 21, 2026. A flaw was found in libssh. During server-side GSSAPI key exchange, a client-supplied Curve25519 public key shorter than the expected length is copied without proper length validation, leading to an out-of-bounds heap read. This could allow a remote unauthenticated attacker to disclose small…
When was CVE-2026-59842 disclosed?
CVE-2026-59842 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-2026-59842 actively exploited?
CVE-2026-59842 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 65.7% of all scored CVEs.
What is the CVSS score of CVE-2026-59842?
CVE-2026-59842 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-59842?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59842, 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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