CVE-2026-8670

CRITICALPre-NVD 9.69.6—
EchelonGraph scoreMEDIUM confidence

Score 9.6 from GitHub Security Advisory (severity: CRITICAL) published 2026-05-26. a secondary CVSS source baseline 9.6; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
9.6
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 9.6Exploit: NoneExposed: 0

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

Insufficient session expiration vulnerability in syslink software AG Avantra on Linux, Windows allows Reusing Session IDs (aka Session Replay).

This issue affects Avantra: before 25.3.1.

CVSS v3
9.6
EG Score
9.6(medium)
EG Risk
43(Track)
EG Risk 43/100SSVC: 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
Severity96% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
12.1%
KEV
Not listed

Published

May 26, 2026

Last Modified

July 23, 2026

References (1)

Vendor Advisories for CVE-2026-8670(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 9× in last 7d / 53× 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 185 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-8670?
CVE-2026-8670 is a critical vulnerability published on May 26, 2026. Insufficient session expiration vulnerability in syslink software AG Avantra on Linux, Windows allows Reusing Session IDs (aka Session Replay). This issue affects Avantra: before 25.3.1.
When was CVE-2026-8670 disclosed?
CVE-2026-8670 was first published in the National Vulnerability Database on May 26, 2026, with the most recent update on July 23, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-8670 actively exploited?
CVE-2026-8670 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 12.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-8670?
CVE-2026-8670 has a CVSS v3 base score of 9.6 (NVD).
How do I remediate CVE-2026-8670?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8670, 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.

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