CVE-2026-0966

HIGHNVD 8.28.2
EchelonGraph scoreMEDIUM confidence

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

This high-severity CVE scores 8.2 under NVD CVSS v3. EPSS exploit probability: 0.6% (50th percentile of EPSS-scored CVEs). GitHub Security Advisory CVSS 6.5 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 2026-03-26) is not newer than that change (2026-11-05), so it does not.

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

Also known asEUVD-2026-16330 (ENISA EUVD) · GHSA-wcqf-w94x-4wg2 (GitHub Security Advisories)Source: ENISA EUVD

8.2EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.6%CVSS: 8.2Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

Fixed versions, as the CVE record's CNA (Red Hat, Inc.) states them in the record's workaround: "Upstream fixed this issue in libssh 0.11.4 and 0.12.0; distribution packages may include a backported fix."

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
8.2HIGHmedium confidence
EG Risk
52
EG Risk 52/100

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)
Severity82% × 45%
Impact severity (EG Severity): CVSS 8.2 of 10. Never the KEV-floored or EPSS-lifted EG Score.
Exploitation0.6% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability100% × 15%
CISA's SSVC Automatable value: yes (Vulnrichment).
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Attend at high (mission-essential systems).
Exploitation none (CISA Vulnrichment) · Automatable yes (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 at low or medium mission impact and sooner than that at high.
EPSS PROB
0.6%
EPSS %ILE
50th
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 (8.2): severity, escalated by confirmed exploitation. This CVE's 8.2 is its impact severity (EG Severity), not escalated.

EG Severity
8.2 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
0.6% within 30 daysSource: FIRST EPSS. 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 low or medium mission impact; Attend at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; 60 days 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 low or medium mission impact; Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (CISA Vulnrichment) · Automatable yes (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)14 days if the affected system is publicly exposed; 60 days if it is not.

The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable yes (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

March 26, 2026

Last Modified

November 5, 2026

Advisory Details (4)

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

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/
Red Hat

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
Red HatMentions a patch (unverified)

cve-details

https://access.redhat.com/security/cve/CVE-2026-0966
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2026:7067

Patch Availability(5)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulibssh-doc (0.11.2-1ubuntu0.2) @ questing2026-11-12ubuntu
ubuntulibssh-gcrypt-dev (0.6.3-4.3ubuntu0.6+esm4) @ xenial2026-11-12ubuntu
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

(6 across 6 ecosystems)
Alpine:v3.23(1)
PackageVulnerable rangeFix by version rangeDependents
libssh—
  • every version up to 0.11.4-r0: fixed in 0.11.4-r0
—
Alpine:v3.24(1)
PackageVulnerable rangeFix by version rangeDependents
libssh—
  • every version up to 0.12.0-r0: fixed in 0.12.0-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, 0.10.5-3, 0.10.5-3+hurd.1, 0.10.6-0+deb12u1, 0.10.6-0+deb12u2
  • every version up to 0.10.6-0+deb12u3: fixed in 0.10.6-0+deb12u3
—
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
  • every version up to 0.12.0-1: fixed in 0.12.0-1
—

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 9× in last 7d / 42× 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 292 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 192 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-11-13 16:50 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  2. 2026-11-12 16:32 UTCEPSS rescoreEPSS 0.6% · 50th percentile
  3. 2026-11-12 14:09 UTCEchelonGraph re-scored
  4. 2026-11-12 14:09 UTCVendor advisory
  5. 2026-11-12 14:09 UTCGHSA enrichmentGHSA-wcqf-w94x-4wg2 · GitHub severity MODERATE · GitHub CVSS 6.5
  6. 2026-11-11 16:37 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  7. 2026-11-10 16:41 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  8. 2026-11-09 16:33 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  9. 2026-11-08 16:37 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  10. 2026-11-07 16:37 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  11. 2026-11-06 16:35 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  12. 2026-11-05 17:27 UTCEchelonGraph re-scored
  13. 2026-11-05 17:27 UTCVendor advisory
  14. 2026-11-05 17:27 UTCGHSA enrichmentGHSA-wcqf-w94x-4wg2 · GitHub severity MODERATE · GitHub CVSS 6.5
  15. 2026-11-05 16:36 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  16. 2026-11-04 16:34 UTCEPSS rescoreEPSS 0.6% · 49th percentile
  17. 2026-11-03 16:45 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  18. 2026-11-02 21:12 UTCEchelonGraph re-scored
  19. 2026-11-02 21:12 UTCVendor advisory
  20. 2026-11-02 21:12 UTCGHSA enrichmentGHSA-wcqf-w94x-4wg2 · GitHub severity MODERATE · GitHub CVSS 6.5
  21. 2026-11-02 16:43 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  22. 2026-11-01 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  23. 2026-10-31 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  24. 2026-10-31 13:50 UTCEchelonGraph re-scored
  25. 2026-10-31 13:50 UTCVendor advisory
Show 75 more
  1. 2026-10-31 13:50 UTCGHSA enrichmentGHSA-wcqf-w94x-4wg2 · GitHub CVSS 6.5
  2. 2026-10-30 16:33 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  3. 2026-10-29 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  4. 2026-10-28 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  5. 2026-10-27 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  6. 2026-10-26 16:30 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  7. 2026-10-25 16:32 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  8. 2026-10-25 15:58 UTCEchelonGraph re-scored
  9. 2026-10-24 17:09 UTCEchelonGraph re-scored
  10. 2026-10-24 17:09 UTCVendor advisory
  11. 2026-10-24 17:09 UTCGHSA enrichmentGHSA-wcqf-w94x-4wg2 · GitHub CVSS 6.5
  12. 2026-10-24 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  13. 2026-10-23 16:31 UTCEPSS rescoreEPSS 0.6% · 48th percentile
  14. 2026-10-22 16:33 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  15. 2026-10-21 16:31 UTCEPSS rescoreEPSS 0.6% · 47th percentile
  16. 2026-10-20 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  17. 2026-10-19 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  18. 2026-10-18 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  19. 2026-10-18 05:11 UTCEchelonGraph re-scored
  20. 2026-10-17 20:29 UTCEchelonGraph re-scored
  21. 2026-10-17 20:29 UTCVendor advisory
  22. 2026-10-17 20:29 UTCGHSA enrichmentGHSA-wcqf-w94x-4wg2 · GitHub CVSS 6.5
  23. 2026-10-17 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  24. 2026-10-16 16:40 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  25. 2026-10-15 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  26. 2026-10-14 16:31 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  27. 2026-10-13 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  28. 2026-10-12 16:42 UTCEchelonGraph re-scored
  29. 2026-10-12 16:33 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  30. 2026-10-11 20:17 UTCEchelonGraph re-scored
  31. 2026-10-11 18:29 UTCEchelonGraph re-scored
  32. 2026-10-11 15:03 UTCEchelonGraph re-scored
  33. 2026-10-11 13:47 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  34. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  35. 2026-10-10 01:03 UTCOSV refresh
  36. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  37. 2026-10-08 17:11 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  38. 2026-10-07 23:47 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  39. 2026-10-06 15:17 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  40. 2026-10-05 17:42 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  41. 2026-10-04 23:21 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  42. 2026-10-03 14:25 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  43. 2026-10-01 19:49 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  44. 2026-09-30 15:02 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  45. 2026-09-29 15:20 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  46. 2026-09-28 13:50 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  47. 2026-09-26 15:58 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  48. 2026-09-23 13:47 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  49. 2026-09-20 20:15 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  50. 2026-09-20 09:03 UTCOSV refresh
  51. 2026-09-18 19:27 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  52. 2026-09-16 05:14 UTCEPSS rescoreEPSS 0.6% · 46th percentile
  53. 2026-09-13 16:46 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  54. 2026-09-12 15:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  55. 2026-09-11 14:52 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  56. 2026-09-11 09:36 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  57. 2026-09-10 09:34 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  58. 2026-09-08 22:00 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  59. 2026-09-07 16:01 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  60. 2026-09-06 13:47 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  61. 2026-09-04 05:06 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  62. 2026-09-02 14:11 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  63. 2026-09-01 13:53 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  64. 2026-09-01 12:27 UTCVendor advisory
  65. 2026-09-01 12:27 UTCGHSA enrichmentGHSA-wcqf-w94x-4wg2 · GitHub CVSS 6.5
  66. 2026-09-01 12:02 UTCEchelonGraph re-scored
  67. 2026-09-01 12:02 UTCVendor advisory
  68. 2026-09-01 12:02 UTCGHSA enrichmentGHSA-wcqf-w94x-4wg2 · GitHub CVSS 6.5
  69. 2026-09-01 04:39 UTCEPSS rescoreEPSS 0.6% · 45th percentile
  70. 2026-08-31 16:43 UTCVendor advisory
  71. 2026-08-31 16:43 UTCGHSA enrichmentGHSA-wcqf-w94x-4wg2 · GitHub CVSS 6.5
  72. 2026-08-31 15:08 UTCEchelonGraph re-scored
  73. 2026-08-31 15:08 UTCVendor advisory
  74. 2026-08-31 15:08 UTCGHSA enrichmentGHSA-wcqf-w94x-4wg2 · GitHub CVSS 6.5
  75. 2026-08-30 19:17 UTCEPSS rescoreEPSS 0.6% · 45th percentile

Frequently asked(5)

What is CVE-2026-0966?
CVE-2026-0966 is a high-severity vulnerability; its CVE record was published on March 26, 2026. 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…
When was CVE-2026-0966 made public?
CVE-2026-0966 was made public on February 10, 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 March 26, 2026. EchelonGraph's copy of the record carries a last-modified date of November 5, 2026; the record at its source may have been updated since.
Is CVE-2026-0966 actively exploited?
CVE-2026-0966 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.6% probability of exploitation in the next 30 days (50th percentile of EPSS-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?
A fix for CVE-2026-0966 is available: update to the fixed version the vendor names in its advisory. Fixed versions, as the CVE record's CNA (Red Hat, Inc.) states them in the record's workaround: "Upstream fixed this issue in libssh 0.11.4 and 0.12.0; distribution packages may include a backported fix." The vendor advisories EchelonGraph has for CVE-2026-0966 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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