CVE-2026-59849

HIGHNVD 7.57.5
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

This high-severity CVE scores 7.5 under NVD CVSS v3. EPSS exploit probability: 0.4% (37th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 3.1 is lower than this score; a lower GitHub score revises it only when its advisory is newer than the CVE record's last change, and this advisory (published 2026-07-21) is not newer than that change (2026-09-22), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
Trending — 4 sources updated this week

Also known asEUVD-2026-46263 (ENISA EUVD) · GHSA-jp6g-7mqj-wj53 (GitHub Security Advisories)Source: ENISA EUVD

7.5EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 7.5Exploit: None knownExposed services: Not assessed

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
7.5HIGHmedium confidence
EG Risk
34
EG Risk 34/100

EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.

How it’s computed (value × EchelonGraph’s weight)
Severity75% × 45%
Impact severity (EG Severity): CVSS 7.5 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's SSVC Automatable value: no (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at every mission impact level.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
0.4%
EPSS %ILE
37th
KEV
Not listed

What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)

The EG score (7.5): severity, escalated by confirmed exploitation. This CVE's 7.5 is its impact severity (EG Severity), not escalated.

EG Severity
7.5 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.NVD CVSS v3 · CVSS v3.0 or v3.1
EG Likelihood
0.4% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-24). FIRST's exploitation probability, not an EchelonGraph model.
Confirmed exploitation
None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
EG Priority
SSVC Track at medium mission impactTrack at every mission impact level.CISA BOD 26-04: 60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source: the SSVC and BOD 26-04 blocks below.

SSVC (CISA's decision table, applied by EchelonGraph)Track 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). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)60 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

July 21, 2026

Last Modified

September 22, 2026

Advisory Details (3)

Auto-updated Jul 30, 2026
Patch available. Sources: redhat.
Red HatMentions a patch (unverified)

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
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-59849
Red HatMentions a patch (unverified)
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 / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibssh-doc (0.11.3-1ubuntu2.1) @ resolute2026-10-20ubuntu
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 rangeFix by version rangeDependents
libssh0.10.4-1 ... 0.9.8-0+deb11u2 (25 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
libssh0.10.5-2 ... 0.12.2-1 (17 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
libssh0.11.2-1, 0.11.2-1+deb13u1, 0.11.3-1
  • every version up to 0.11.5-0+deb13u1: fixed in 0.11.5-0+deb13u1
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
libssh0.11.2-1, 0.11.3-1, 0.12.0-1, 0.12.0-2, 0.12.0-3
  • every version up to 0.12.1-1: fixed in 0.12.1-1
—

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 11× in last 7d / 50× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 100 of 342 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 242 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-26 16:31 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  2. 2026-10-25 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  3. 2026-10-25 14:16 UTCEG score recompute
  4. 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  5. 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  6. 2026-10-22 16:34 UTCEPSS rescoreEPSS 0.4% · 37th percentile
  7. 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  8. 2026-10-20 18:57 UTCEG score recompute
  9. 2026-10-20 18:57 UTCVendor advisory
  10. 2026-10-20 18:57 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  11. 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  12. 2026-10-19 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  13. 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  14. 2026-10-18 03:27 UTCEG score recompute
  15. 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  16. 2026-10-16 16:43 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  17. 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  18. 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  19. 2026-10-13 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  20. 2026-10-13 15:48 UTCEG score recompute
  21. 2026-10-13 15:48 UTCVendor advisory
  22. 2026-10-13 15:48 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  23. 2026-10-12 16:34 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  24. 2026-10-12 15:52 UTCEG score recompute
  25. 2026-10-11 19:36 UTCEG score recompute
Show 75 more
  1. 2026-10-11 16:51 UTCEG score recompute
  2. 2026-10-11 14:13 UTCEG score recompute
  3. 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  4. 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  5. 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  6. 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  7. 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.4% · 36th percentile
  8. 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  9. 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  10. 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  11. 2026-10-04 14:50 UTCEG score recompute
  12. 2026-10-04 14:50 UTCVendor advisory
  13. 2026-10-04 14:50 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  14. 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  15. 2026-10-02 17:56 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  16. 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  17. 2026-10-01 07:31 UTCEG score recompute
  18. 2026-10-01 07:31 UTCVendor advisory
  19. 2026-10-01 07:30 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  20. 2026-09-30 15:03 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  21. 2026-09-29 15:22 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  22. 2026-09-28 13:51 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  23. 2026-09-28 06:11 UTCEG score recompute
  24. 2026-09-28 06:11 UTCVendor advisory
  25. 2026-09-28 06:11 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  26. 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  27. 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  28. 2026-09-24 14:04 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  29. 2026-09-24 03:24 UTCEG score recompute
  30. 2026-09-24 03:24 UTCVendor advisory
  31. 2026-09-24 03:24 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  32. 2026-09-23 17:54 UTCEPSS rescoreEPSS 0.3% · 17th percentile
  33. 2026-09-23 06:50 UTCVendor advisory
  34. 2026-09-23 06:50 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  35. 2026-09-22 19:55 UTCEG score recompute
  36. 2026-09-22 19:55 UTCVendor advisory
  37. 2026-09-22 19:55 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  38. 2026-09-20 20:16 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  39. 2026-09-20 05:59 UTCEG score recompute
  40. 2026-09-20 05:59 UTCVendor advisory
  41. 2026-09-20 05:59 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  42. 2026-09-19 00:23 UTCEG score recompute
  43. 2026-09-19 00:23 UTCVendor advisory
  44. 2026-09-19 00:23 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  45. 2026-09-18 19:28 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  46. 2026-09-18 03:50 UTCEG score recompute
  47. 2026-09-18 03:50 UTCVendor advisory
  48. 2026-09-18 03:50 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  49. 2026-09-17 19:31 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  50. 2026-09-17 05:06 UTCEG score recompute
  51. 2026-09-17 05:06 UTCVendor advisory
  52. 2026-09-17 05:06 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  53. 2026-09-16 14:08 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  54. 2026-09-16 12:39 UTCEG score recompute
  55. 2026-09-16 12:39 UTCVendor advisory
  56. 2026-09-16 12:39 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  57. 2026-09-16 05:15 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  58. 2026-09-15 03:11 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  59. 2026-09-14 04:53 UTCVendor advisory
  60. 2026-09-14 04:53 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  61. 2026-09-13 17:59 UTCEG score recompute
  62. 2026-09-13 17:59 UTCVendor advisory
  63. 2026-09-13 17:59 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  64. 2026-09-13 16:47 UTCEPSS rescoreEPSS 0.2% · 15th percentile
  65. 2026-09-13 07:01 UTCVendor advisory
  66. 2026-09-13 07:01 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  67. 2026-09-12 19:11 UTCEG score recompute
  68. 2026-09-12 19:11 UTCVendor advisory
  69. 2026-09-12 19:11 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  70. 2026-09-12 07:25 UTCVendor advisory
  71. 2026-09-12 07:25 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  72. 2026-09-11 20:31 UTCEG score recompute
  73. 2026-09-11 20:31 UTCVendor advisory
  74. 2026-09-11 20:31 UTCGHSA enrichmentGHSA-jp6g-7mqj-wj53 · GitHub severity LOW · GitHub CVSS 3.1
  75. 2026-09-11 14:53 UTCEPSS rescoreEPSS 0.2% · 15th percentile

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Frequently asked(5)

What is CVE-2026-59849?
CVE-2026-59849 is a high-severity vulnerability; its CVE record was 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 made public?
CVE-2026-59849 was made public on July 21, 2026: that is the date its CVE record's CNA, Red Hat, Inc., gives for when the vulnerability was made public. The CVE record itself was published on July 21, 2026. EchelonGraph's copy of the record carries a last-modified date of September 22, 2026; the record at its source may have been updated since.
Is CVE-2026-59849 actively exploited?
CVE-2026-59849 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (37th percentile of EPSS-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?
A fix for CVE-2026-59849 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-59849 are linked in the Vendor Advisories panel on this page.

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