CVE-2026-55400

MEDIUMNVD 6.56.5—
EchelonGraph scoreMEDIUM confidence

Score 6.5 from GitHub Security Advisory published 2026-08-13. NVD baseline CVSS 6.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 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: 0.4%CVSS: 6.5Exploit: None knownExposed services: Not assessed

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

CVE-2026-55400 is an integer underflow in Secure Access servers prior to version 14.57. Attackers with an authenticated session can send specially crafted traffic to a server in a non-default configuration and cause a persistent denial of service.

CVSS v3
6.5
EG Score
6.5MEDIUMmedium confidence
EG Risk
29
EG Risk 29/100CISA SSVC

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%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.4%
EPSS %ILE
28th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 13, 2026

Last Modified

September 4, 2026

Advisory Details (1)

Auto-updated Aug 13, 2026
No patch confirmed yet.
generic

CVE-2026-55400 | Absolute Security

https://www.absolute.com/platform/security-information/vulnerability-archive/cve-2026-55400

Vendor Advisories for CVE-2026-55400(1)

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

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 14× in last 7d / 69× 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 136 total refreshes for this CVE.

  1. 2026-10-04 23:22 UTCEPSS rescore
  2. 2026-10-04 22:19 UTCGHSA enrichment
  3. 2026-10-03 19:48 UTCEG score recompute
  4. 2026-10-03 19:48 UTCGHSA enrichment
  5. 2026-10-03 14:26 UTCEPSS rescore
  6. 2026-10-02 17:56 UTCEPSS rescore
  7. 2026-10-02 07:33 UTCEG score recompute
  8. 2026-10-02 07:33 UTCGHSA enrichment
  9. 2026-10-01 19:50 UTCEPSS rescore
  10. 2026-09-30 21:46 UTCEG score recompute
  11. 2026-09-30 21:46 UTCGHSA enrichment
  12. 2026-09-30 15:03 UTCEPSS rescore
  13. 2026-09-29 15:22 UTCEPSS rescore
  14. 2026-09-28 13:51 UTCEPSS rescore
  15. 2026-09-28 12:15 UTCEG score recompute
  16. 2026-09-28 12:15 UTCGHSA enrichment
  17. 2026-09-27 13:48 UTCEPSS rescore
  18. 2026-09-27 09:44 UTCEG score recompute
  19. 2026-09-27 09:44 UTCGHSA enrichment
  20. 2026-09-26 15:59 UTCEPSS rescore
  21. 2026-09-25 03:33 UTCEG score recompute
  22. 2026-09-25 03:33 UTCGHSA enrichment
  23. 2026-09-24 14:04 UTCEPSS rescore
  24. 2026-09-23 17:54 UTCEPSS rescore
  25. 2026-09-23 13:31 UTCEG score recompute
Show 75 more
  1. 2026-09-23 13:31 UTCGHSA enrichment
  2. 2026-09-22 11:30 UTCEG score recompute
  3. 2026-09-22 11:29 UTCGHSA enrichment
  4. 2026-09-21 09:30 UTCEG score recompute
  5. 2026-09-21 09:30 UTCGHSA enrichment
  6. 2026-09-20 20:16 UTCEPSS rescore
  7. 2026-09-20 05:55 UTCEG score recompute
  8. 2026-09-20 05:55 UTCGHSA enrichment
  9. 2026-09-19 03:56 UTCEG score recompute
  10. 2026-09-19 03:56 UTCGHSA enrichment
  11. 2026-09-18 19:28 UTCEPSS rescore
  12. 2026-09-18 01:58 UTCEG score recompute
  13. 2026-09-18 01:58 UTCGHSA enrichment
  14. 2026-09-17 19:31 UTCEPSS rescore
  15. 2026-09-16 23:59 UTCEG score recompute
  16. 2026-09-16 23:59 UTCGHSA enrichment
  17. 2026-09-16 14:08 UTCEPSS rescore
  18. 2026-09-16 05:15 UTCEPSS rescore
  19. 2026-09-15 20:08 UTCEG score recompute
  20. 2026-09-15 20:08 UTCGHSA enrichment
  21. 2026-09-15 03:11 UTCEPSS rescore
  22. 2026-09-14 15:40 UTCEG score recompute
  23. 2026-09-14 15:40 UTCGHSA enrichment
  24. 2026-09-13 16:47 UTCEPSS rescore
  25. 2026-09-13 13:41 UTCEG score recompute
  26. 2026-09-13 13:41 UTCGHSA enrichment
  27. 2026-09-12 11:42 UTCEG score recompute
  28. 2026-09-12 11:41 UTCGHSA enrichment
  29. 2026-09-11 14:53 UTCEPSS rescore
  30. 2026-09-11 09:15 UTCEG score recompute
  31. 2026-09-11 09:15 UTCGHSA enrichment
  32. 2026-09-10 09:35 UTCEPSS rescore
  33. 2026-09-10 07:16 UTCGHSA enrichment
  34. 2026-09-09 05:18 UTCEG score recompute
  35. 2026-09-09 05:17 UTCGHSA enrichment
  36. 2026-09-08 22:01 UTCEPSS rescore
  37. 2026-09-08 03:19 UTCEG score recompute
  38. 2026-09-08 03:19 UTCGHSA enrichment
  39. 2026-09-07 16:01 UTCEPSS rescore
  40. 2026-09-07 01:20 UTCEG score recompute
  41. 2026-09-07 01:20 UTCGHSA enrichment
  42. 2026-09-06 13:47 UTCEPSS rescore
  43. 2026-09-05 22:44 UTCEG score recompute
  44. 2026-09-05 22:44 UTCGHSA enrichment
  45. 2026-09-04 20:45 UTCEG score recompute▲ 0.50
  46. 2026-09-04 20:45 UTCGHSA enrichment
  47. 2026-09-04 20:41 UTCNVD updateCVSS v3 → 6.5
  48. 2026-09-04 13:19 UTCEG score recompute
  49. 2026-09-04 13:18 UTCGHSA enrichment
  50. 2026-09-04 05:06 UTCEPSS rescore
  51. 2026-09-03 11:18 UTCEG score recompute
  52. 2026-09-03 11:17 UTCGHSA enrichment
  53. 2026-09-02 14:12 UTCEPSS rescore
  54. 2026-09-02 08:19 UTCEG score recompute
  55. 2026-09-02 08:19 UTCGHSA enrichment
  56. 2026-09-01 13:54 UTCEPSS rescore
  57. 2026-09-01 06:16 UTCEG score recompute
  58. 2026-09-01 06:16 UTCGHSA enrichment
  59. 2026-09-01 04:40 UTCEPSS rescore
  60. 2026-08-31 01:44 UTCEG score recompute
  61. 2026-08-31 01:44 UTCGHSA enrichment
  62. 2026-08-30 19:17 UTCEPSS rescore
  63. 2026-08-30 01:22 UTCEPSS rescore
  64. 2026-08-29 23:45 UTCGHSA enrichment
  65. 2026-08-28 21:45 UTCEG score recompute
  66. 2026-08-28 21:44 UTCGHSA enrichment
  67. 2026-08-28 21:41 UTCEPSS rescore
  68. 2026-08-27 21:11 UTCEG score recompute
  69. 2026-08-27 21:11 UTCGHSA enrichment
  70. 2026-08-27 14:25 UTCEPSS rescore
  71. 2026-08-26 19:12 UTCEG score recompute
  72. 2026-08-26 19:12 UTCGHSA enrichment
  73. 2026-08-26 14:46 UTCEPSS rescore
  74. 2026-08-25 17:13 UTCEG score recompute
  75. 2026-08-25 17:13 UTCGHSA enrichment

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Frequently asked(5)

What is CVE-2026-55400?
CVE-2026-55400 is a medium vulnerability published on August 13, 2026. CVE-2026-55400 is an integer underflow in Secure Access servers prior to version 14.57. Attackers with an authenticated session can send specially crafted traffic to a server in a non-default configuration and cause a persistent denial of service.
When was CVE-2026-55400 disclosed?
CVE-2026-55400 was first published on August 13, 2026, with the most recent update on September 4, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-55400 actively exploited?
CVE-2026-55400 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (28th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-55400?
CVE-2026-55400 has a CVSS v3 base score of 6.5 (NVD).
How do I remediate CVE-2026-55400?
No fix for CVE-2026-55400 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-55400 are linked in the Vendor Advisories panel on this page.

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