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
9.6EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.6Exploit: None knownExposed: 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 PROB
0%
EPSS %ILE
12%
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 6× in last 7d / 40× 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 335 total refreshes for this CVE.

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

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 0% probability of exploitation in the next 30 days, which ranks it in the top 87.9% of all scored CVEs.
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.

Dependency Blast Radius

Explore the affected products and dependency analysis for CVE-2026-8670

Explore →

Is Your Infrastructure Affected by CVE-2026-8670?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs