CVE-2026-55654

LOWPre-NVD 3.73.7—
EchelonGraph scoreMEDIUM confidence

Score 3.7 from GitHub Security Advisory (severity: LOW) published 2026-06-23. a secondary CVSS source baseline 3.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
3.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0.7%CVSS: 3.7Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A remote attacker, under specific configurations involving GSSAPI authentication and a Kerberos environment, could exploit this to cause the SSH authentication path to crash or abort. This leads to a denial of service (DoS), impacting the availability of the SSH service.

CVSS v3
3.7
EG Score
3.7LOWmedium confidence
EG Risk
17
EG Risk 17/100

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
Severity37% × 45%
Exploitation1% × 40%
Automatability0% × 15%
EPSS PROB
0.7%
EPSS %ILE
49th
KEV
Not listed

Published

June 23, 2026

Last Modified

September 24, 2026

References (7)

Vendor Advisories for CVE-2026-55654(6)

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 / EcosystemFix (by version range) / PatchReleasedSource
redhatrhui5/rhua-tp-rhel9:17872412602026-08-24redhat
redhatrhui5/rhua-rhel9:17865335292026-08-12redhat
redhatopenssh-0:9.9p1-25.el10_22026-07-30redhat
redhatopenssh-0:9.9p1-9.el9_82026-07-29redhat
redhatopenssh-main-10.3p1-6.hum12026-07-08redhat

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

(5 across 4 ecosystems)
Debian:14(2)
PackageVulnerable rangeFix by version rangeDependents
openssh1:10.0p1-7 ... 1:10.4p1-4 (25 versions)
  • every version up to 1:10.4p1-5: fixed in 1:10.4p1-5
—
openssh-gssapi1:10.4p1-5, 1:10.5p1-1
  • every version on: no fix on record
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
openssh1:10.0p1-1 ... 1:9.9p2-2 (86 versions)
  • every version on: no fix on record
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
openssh1:10.0p1-1 ... 1:9.9p2-2 (77 versions)
  • every version on: no fix on record
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
openssh1:10.0p1-7 ... 1:10.5p1-1 (31 versions)
  • every version on: no fix on record
—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 41× 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 195 total refreshes for this CVE.

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

Related CVEs(same product + same vendor + same CWE)

Frequently asked(5)

What is CVE-2026-55654?
CVE-2026-55654 is a low vulnerability published on June 23, 2026. A flaw was found in OpenSSH. This vulnerability, a heap out-of-bounds read, occurs during the cleanup of GSSAPI (Generic Security Service Application Programming Interface) indicators when a trailing NULL termination is missing in the auth-indicators array. A remote attacker, under specific…
When was CVE-2026-55654 disclosed?
CVE-2026-55654 was first published on June 23, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55654 actively exploited?
CVE-2026-55654 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.7% probability of exploitation in the next 30 days (49th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55654?
CVE-2026-55654 has a CVSS base score of 3.7 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-55654?
A fix for CVE-2026-55654 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-55654 are linked in the Vendor Advisories panel on this page.

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