CVE-2026-59844

MEDIUMPre-NVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-07-21. a secondary CVSS source baseline 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
6.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 6.5Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in libssh. A remote authenticated client can issue SSH_FXP_READ requests with an arbitrarily large length, causing a libssh SFTP server to allocate excessive memory and potentially exhaust it through repeated requests.

CVSS v3
6.5
EG Score
6.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity65% × 45%
Exploitation1% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
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

2498177 – (CVE-2026-59844) CVE-2026-59844 libssh: libssh: denial of service via oversized SFTP read length

https://bugzilla.redhat.com/show_bug.cgi?id=2498177
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-59844

Vendor Advisories for CVE-2026-59844(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) @ resolute2026-09-11ubuntu
redhatlibssh-0:0.9.6-17.el8_102026-09-01redhat
redhatlibssh-0:0.10.4-19.el9_82026-09-01redhat
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 / 97× 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 185 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 09:13 UTCEG score recompute
  19. 2026-09-05 09:13 UTCVendor advisory
  20. 2026-09-05 09:13 UTCGHSA enrichment
  21. 2026-09-04 05:07 UTCEPSS rescore
  22. 2026-09-02 14:12 UTCEPSS rescore
  23. 2026-09-01 21:27 UTCEG score recompute
  24. 2026-09-01 21:27 UTCVendor advisory
  25. 2026-09-01 21:27 UTCGHSA enrichment
Show 75 more
  1. 2026-09-01 20:23 UTCVendor advisory
  2. 2026-09-01 20:23 UTCGHSA enrichment
  3. 2026-09-01 19:24 UTCEG score recompute
  4. 2026-09-01 19:24 UTCVendor advisory
  5. 2026-09-01 19:24 UTCGHSA enrichment
  6. 2026-09-01 13:54 UTCEPSS rescore
  7. 2026-09-01 04:40 UTCEPSS rescore
  8. 2026-08-31 03:16 UTCEG score recompute
  9. 2026-08-31 03:16 UTCVendor advisory
  10. 2026-08-31 03:16 UTCGHSA enrichment
  11. 2026-08-30 19:17 UTCEPSS rescore
  12. 2026-08-30 02:23 UTCEG score recompute
  13. 2026-08-30 02:23 UTCVendor advisory
  14. 2026-08-30 02:23 UTCGHSA enrichment
  15. 2026-08-30 01:22 UTCEPSS rescore
  16. 2026-08-28 21:42 UTCEPSS rescore
  17. 2026-08-27 14:25 UTCEPSS rescore
  18. 2026-08-27 11:30 UTCEG score recompute
  19. 2026-08-27 11:30 UTCVendor advisory
  20. 2026-08-27 11:30 UTCGHSA enrichment
  21. 2026-08-26 14:46 UTCEPSS rescore
  22. 2026-08-26 05:44 UTCEG score recompute
  23. 2026-08-26 05:44 UTCVendor advisory
  24. 2026-08-26 05:44 UTCGHSA enrichment
  25. 2026-08-25 13:49 UTCEPSS rescore
  26. 2026-08-25 04:36 UTCEG score recompute
  27. 2026-08-25 04:36 UTCVendor advisory
  28. 2026-08-25 04:35 UTCGHSA enrichment
  29. 2026-08-24 03:43 UTCVendor advisory
  30. 2026-08-24 03:43 UTCGHSA enrichment
  31. 2026-08-23 02:50 UTCEG score recompute
  32. 2026-08-23 02:50 UTCVendor advisory
  33. 2026-08-23 02:50 UTCGHSA enrichment
  34. 2026-08-23 00:19 UTCEPSS rescore
  35. 2026-08-22 01:57 UTCEG score recompute
  36. 2026-08-22 01:57 UTCVendor advisory
  37. 2026-08-22 01:57 UTCGHSA enrichment
  38. 2026-08-21 23:49 UTCEPSS rescore
  39. 2026-08-21 01:04 UTCEG score recompute
  40. 2026-08-21 01:04 UTCVendor advisory
  41. 2026-08-21 01:04 UTCGHSA enrichment
  42. 2026-08-20 22:55 UTCEPSS rescore
  43. 2026-08-20 00:12 UTCEG score recompute
  44. 2026-08-20 00:12 UTCVendor advisory
  45. 2026-08-20 00:12 UTCGHSA enrichment
  46. 2026-08-19 17:04 UTCEPSS rescore
  47. 2026-08-18 23:20 UTCEG score recompute
  48. 2026-08-18 23:20 UTCVendor advisory
  49. 2026-08-18 23:20 UTCGHSA enrichment
  50. 2026-08-18 13:48 UTCEPSS rescore
  51. 2026-08-17 22:25 UTCEG score recompute
  52. 2026-08-17 22:25 UTCVendor advisory
  53. 2026-08-17 22:25 UTCGHSA enrichment
  54. 2026-08-17 22:00 UTCEG score recompute
  55. 2026-08-17 22:00 UTCVendor advisory
  56. 2026-08-17 22:00 UTCGHSA enrichment
  57. 2026-08-17 13:47 UTCEPSS rescore
  58. 2026-08-16 23:52 UTCEG score recompute
  59. 2026-08-16 23:52 UTCVendor advisory
  60. 2026-08-16 23:52 UTCGHSA enrichment
  61. 2026-08-16 14:56 UTCEPSS rescore
  62. 2026-08-16 02:14 UTCEPSS rescore
  63. 2026-08-15 23:00 UTCEG score recompute
  64. 2026-08-15 23:00 UTCVendor advisory
  65. 2026-08-15 23:00 UTCGHSA enrichment
  66. 2026-08-15 01:30 UTCEPSS rescore
  67. 2026-08-14 22:07 UTCEG score recompute
  68. 2026-08-14 22:07 UTCVendor advisory
  69. 2026-08-14 22:07 UTCGHSA enrichment
  70. 2026-08-13 22:00 UTCEPSS rescore
  71. 2026-08-13 21:14 UTCVendor advisory
  72. 2026-08-13 21:14 UTCGHSA enrichment
  73. 2026-08-12 20:21 UTCEG score recompute
  74. 2026-08-12 20:21 UTCVendor advisory
  75. 2026-08-12 20:21 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-59844?
CVE-2026-59844 is a medium vulnerability published on July 21, 2026. A flaw was found in libssh. A remote authenticated client can issue SSHFXPREAD requests with an arbitrarily large length, causing a libssh SFTP server to allocate excessive memory and potentially exhaust it through repeated requests.
When was CVE-2026-59844 disclosed?
CVE-2026-59844 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-2026-59844 actively exploited?
CVE-2026-59844 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 54.8% of all scored CVEs.
What is the CVSS score of CVE-2026-59844?
CVE-2026-59844 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-59844?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-59844, 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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