CVE-2026-55654

LOWPre-NVD 3.73.7—
EchelonGraph scoreMEDIUM confidence

Score 3.7 from GitHub Security Advisory (severity: LOW) published 2026-06-23. the CNA's CVSS baseline 3.7; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cna:redhat, epss, ghsa
Trending — 4 sources updated this week
3.7EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 3.7Exploit: None knownExposed: 0

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
3.7(medium)
EG Risk
17(Track)
EG Risk 17/100SSVC: 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
Severity37% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
36%
KEV
Not listed

Published

June 23, 2026

Last Modified

August 19, 2026

References (6)

Vendor Advisories for CVE-2026-55654(5)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(4)

Vendor / EcosystemFixed in / PatchReleasedSource
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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
openssh1:10.0p1-1 ... 1:9.9p2-2 (86 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
openssh1:10.0p1-1 ... 1:9.9p2-2 (75 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
openssh1:10.0p1-7 ... 1:10.4p1-4 (29 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
openssh1:10.0p1-7 ... 1:10.4p1-4 (25 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 13× in last 7d / 63× 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 118 total refreshes for this CVE.

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

Related CVEs(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 in the National Vulnerability Database on June 23, 2026, with the most recent update on August 19, 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% probability of exploitation in the next 30 days, which ranks it in the top 63.8% of all scored CVEs.
What is the CVSS score of CVE-2026-55654?
CVE-2026-55654 has a CVSS v4.0 base score of 3.7 (CNA self-assessment; NVD's own analysis pending).
How do I remediate CVE-2026-55654?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-55654, 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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