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% (38th 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 (2026-11-06), so it does not.

Triggered by: Headline CVSS from NVD CVSS v3
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3

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
38th
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 2026-11-06). 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, and whom BOD 26-04 binds: 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.

The score's inputs: 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

November 6, 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

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibssh-doc (0.11.3-1ubuntu2.1) @ resolute2026-10-27ubuntu
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

(5 across 5 ecosystems)
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
libssh—
  • 0.11.0 up to 0.12.1-r0: fixed in 0.12.1-r0
—
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 / 40× 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 its CVE.org record (CNA or CISA ADP). 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). "EchelonGraph re-scored" is our own recompute of this CVE's score, not an update from a source, and is not counted in the refreshes above. Most recent first.

Showing the most recent 100 of 371 rows 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 271 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

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

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 November 6, 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 (38th 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.

Dependency Blast Radius

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