CVE-2026-0966

HIGHNVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.6%, top 55% 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
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.2Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in libssh. The API function ssh_get_hexa() is vulnerable to a denial of service when processing zero-length input. This can be exploited remotely by an attacker during GSSAPI (Generic Security Service Application Program Interface) authentication if the server's logging verbosity is set to SSH_LOG_PACKET (3) or higher. Successful exploitation could lead to a self-Denial of Service of the per-connection daemon process.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: 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
Severity82% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
45%
KEV
Not listed

Published

March 26, 2026

Last Modified

August 21, 2026

Advisory Details (4)

Auto-updated Apr 30, 2026
Patch available. Sources: redhat.
generic

libssh 0.12.0 and 0.11.4 security releases – libssh

https://www.libssh.org/2026/02/10/libssh-0-12-0-and-0-11-4-security-releases/
redhat

2433121 – (CVE-2026-0966) CVE-2026-0966 libssh: Buffer underflow in ssh_get_hexa() on invalid input

https://bugzilla.redhat.com/show_bug.cgi?id=2433121
redhat Patch Available

cve-details

https://access.redhat.com/security/cve/CVE-2026-0966
redhat Patch Available
https://access.redhat.com/errata/RHSA-2026:7067

Vendor Advisories for CVE-2026-0966(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 (0.11.2-1ubuntu0.2) @ questing2026-08-21ubuntu
ubuntulibssh-gcrypt-dev (0.8.0~20170825.94fa1e38-1ubuntu0.7+esm6) @ bionic2026-08-21ubuntu
redhatlibssh-0:0.12.0-2.el102026-05-19redhat
redhatlibssh-0:0.10.4-18.el92026-05-19redhat
redhatlibssh-main-0.12.0-1.1.hum12026-04-08redhat

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, 0.11.3-10.12.0-1—

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 10× in last 7d / 75× 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 189 total refreshes for this CVE.

  1. 2026-08-25 13:48 UTCEPSS rescore
  2. 2026-08-23 00:19 UTCEPSS rescore
  3. 2026-08-21 23:48 UTCEPSS rescore
  4. 2026-08-21 12:20 UTCVendor advisory
  5. 2026-08-21 12:20 UTCGHSA enrichment
  6. 2026-08-21 12:15 UTCEG score recompute
  7. 2026-08-21 12:15 UTCVendor advisory
  8. 2026-08-21 12:15 UTCGHSA enrichment
  9. 2026-08-20 22:55 UTCEPSS rescore
  10. 2026-08-19 17:03 UTCEPSS rescore
  11. 2026-08-18 13:48 UTCEPSS rescore
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 10:05 UTCEG score recompute
  14. 2026-08-16 10:05 UTCVendor advisory
  15. 2026-08-16 10:05 UTCGHSA enrichment
  16. 2026-08-16 02:14 UTCEPSS rescore
  17. 2026-08-15 01:30 UTCEPSS rescore
  18. 2026-08-14 19:26 UTCVendor advisory
  19. 2026-08-14 19:26 UTCGHSA enrichment
  20. 2026-08-14 06:24 UTCEG score recompute
  21. 2026-08-14 06:24 UTCVendor advisory
  22. 2026-08-14 06:24 UTCGHSA enrichment
  23. 2026-08-13 22:00 UTCEPSS rescore
  24. 2026-08-12 20:41 UTCEG score recompute
  25. 2026-08-12 20:41 UTCVendor advisory
Show 75 more
  1. 2026-08-12 20:41 UTCGHSA enrichment
  2. 2026-08-12 13:50 UTCEPSS rescore
  3. 2026-08-11 20:48 UTCEG score recompute
  4. 2026-08-11 20:48 UTCVendor advisory
  5. 2026-08-11 20:48 UTCGHSA enrichment
  6. 2026-08-11 13:42 UTCEPSS rescore
  7. 2026-08-11 03:50 UTCEG score recompute
  8. 2026-08-11 03:50 UTCVendor advisory
  9. 2026-08-11 03:50 UTCGHSA enrichment
  10. 2026-08-10 23:59 UTCEPSS rescore
  11. 2026-08-10 04:21 UTCVendor advisory
  12. 2026-08-10 04:21 UTCGHSA enrichment
  13. 2026-08-09 17:06 UTCEG score recompute
  14. 2026-08-09 17:06 UTCVendor advisory
  15. 2026-08-09 17:06 UTCGHSA enrichment
  16. 2026-08-09 13:46 UTCEPSS rescore
  17. 2026-08-09 05:57 UTCEG score recompute
  18. 2026-08-09 05:57 UTCVendor advisory
  19. 2026-08-09 05:57 UTCGHSA enrichment
  20. 2026-08-08 16:37 UTCEPSS rescore
  21. 2026-08-08 03:31 UTCEG score recompute
  22. 2026-08-08 03:31 UTCVendor advisory
  23. 2026-08-08 03:31 UTCGHSA enrichment
  24. 2026-08-07 16:22 UTCVendor advisory
  25. 2026-08-07 16:22 UTCGHSA enrichment
  26. 2026-08-06 18:45 UTCEG score recompute
  27. 2026-08-06 18:45 UTCVendor advisory
  28. 2026-08-06 18:45 UTCGHSA enrichment
  29. 2026-08-06 13:46 UTCEPSS rescore
  30. 2026-08-06 00:50 UTCEG score recompute
  31. 2026-08-06 00:50 UTCVendor advisory
  32. 2026-08-06 00:50 UTCGHSA enrichment
  33. 2026-08-05 19:17 UTCEPSS rescore
  34. 2026-08-04 15:09 UTCEPSS rescore
  35. 2026-08-04 10:38 UTCEPSS rescore
  36. 2026-08-03 23:16 UTCEG score recompute
  37. 2026-08-03 23:16 UTCVendor advisory
  38. 2026-08-03 23:16 UTCGHSA enrichment
  39. 2026-08-03 10:35 UTCEPSS rescore
  40. 2026-08-03 02:32 UTCVendor advisory
  41. 2026-08-03 02:32 UTCGHSA enrichment
  42. 2026-08-02 15:21 UTCEG score recompute
  43. 2026-08-02 15:21 UTCVendor advisory
  44. 2026-08-02 15:21 UTCGHSA enrichment
  45. 2026-08-02 02:26 UTCEPSS rescore
  46. 2026-08-01 04:15 UTCEPSS rescore
  47. 2026-07-30 16:27 UTCEPSS rescore
  48. 2026-07-30 01:30 UTCEPSS rescore
  49. 2026-07-28 15:36 UTCEPSS rescore
  50. 2026-07-27 14:13 UTCEPSS rescore
  51. 2026-07-26 14:54 UTCEPSS rescore
  52. 2026-07-26 14:54 UTCEPSS rescore
  53. 2026-07-25 14:17 UTCEPSS rescore
  54. 2026-07-24 14:17 UTCEPSS rescore
  55. 2026-07-23 14:18 UTCEPSS rescore
  56. 2026-07-23 03:04 UTCEG score recompute▲ 1.70
  57. 2026-07-22 14:08 UTCEPSS rescore
  58. 2026-07-21 15:24 UTCEPSS rescore
  59. 2026-07-20 17:08 UTCEPSS rescore
  60. 2026-07-19 14:30 UTCEPSS rescore
  61. 2026-07-19 02:28 UTCEPSS rescore
  62. 2026-07-18 10:04 UTCEPSS rescore
  63. 2026-07-17 05:24 UTCOSV refresh
  64. 2026-07-16 17:02 UTCEPSS rescore
  65. 2026-07-15 16:57 UTCEPSS rescore
  66. 2026-07-15 02:00 UTCEPSS rescore
  67. 2026-07-13 22:30 UTCEPSS rescore
  68. 2026-07-13 06:12 UTCEPSS rescore
  69. 2026-07-12 05:46 UTCEPSS rescore
  70. 2026-07-11 08:27 UTCEPSS rescore
  71. 2026-07-09 19:10 UTCEPSS rescore
  72. 2026-07-08 15:15 UTCEPSS rescore
  73. 2026-07-08 15:15 UTCEPSS rescore
  74. 2026-07-07 13:46 UTCEPSS rescore
  75. 2026-07-06 16:27 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-0966?
CVE-2026-0966 is a high vulnerability published on March 26, 2026. A flaw was found in libssh. The API function sshgethexa() is vulnerable to a denial of service when processing zero-length input. This can be exploited remotely by an attacker during GSSAPI (Generic Security Service Application Program Interface) authentication if the server's logging verbosity is…
When was CVE-2026-0966 disclosed?
CVE-2026-0966 was first published in the National Vulnerability Database on March 26, 2026, with the most recent update on August 21, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-0966 actively exploited?
CVE-2026-0966 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-2026-0966?
CVE-2026-0966 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2026-0966?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-0966, 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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