CVE-2026-6679

HIGHNVD 7.57.5—
EchelonGraph scoreHIGH confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-06-25. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
7.5
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 0%CVSS: 7.5Exploit: NoneExposed: 0

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

A heap buffer overflow could occur in the DTLS 1.3 ACK serialization path before the connecting peer is authenticated. The buffer overflow was due to an integer truncation when computing the length of the ACK record-number list, causing an undersized buffer to be allocated and then overrun. This affects builds using DTLS 1.3 and wolfSSL version 5.9.0 and earlier. A fix was added to the 5.9.1 release.

CVSS v3
7.5
EG Score
7.5(high)
EPSS
31.0%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 27, 2026

Advisory Details (2)

Auto-updated Jun 26, 2026
Patch available. Sources: github_pr.
generic Patch Available

wolfSSL Security Vulnerabilities | Documentation - wolfSSL

https://www.wolfssl.com/docs/security-vulnerabilities/
github_pr

Additional fixes

Fix merged in wolfSSL/wolfssl PR #10116 on 2026-04-07 — awaiting tagged release

https://github.com/wolfSSL/wolfssl/pull/10116

Vendor Advisories for CVE-2026-6679(1)

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

Weakness Classification(3)

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

Data Freshness Timeline

(refreshed 12× in last 7d / 80× 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.

  1. 2026-07-22 14:08 UTCEPSS rescore
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:25 UTCEPSS rescore
  4. 2026-07-21 15:25 UTCEPSS rescore
  5. 2026-07-20 17:08 UTCEPSS rescore
  6. 2026-07-19 14:31 UTCEPSS rescore
  7. 2026-07-19 02:29 UTCEPSS rescore
  8. 2026-07-18 10:04 UTCEPSS rescore
  9. 2026-07-17 02:18 UTCGHSA enrichment
  10. 2026-07-16 17:03 UTCEPSS rescore
  11. 2026-07-16 13:30 UTCGHSA enrichment
  12. 2026-07-16 00:53 UTCGHSA enrichment
  13. 2026-07-15 16:57 UTCEPSS rescore
  14. 2026-07-15 12:22 UTCGHSA enrichment
  15. 2026-07-15 02:00 UTCEPSS rescore
  16. 2026-07-14 23:49 UTCGHSA enrichment
  17. 2026-07-14 11:18 UTCGHSA enrichment
  18. 2026-07-13 22:47 UTCGHSA enrichment
  19. 2026-07-13 22:31 UTCEPSS rescore
  20. 2026-07-13 10:14 UTCGHSA enrichment
  21. 2026-07-13 06:13 UTCEPSS rescore
  22. 2026-07-13 06:13 UTCEPSS rescore
  23. 2026-07-12 21:43 UTCGHSA enrichment
  24. 2026-07-12 09:12 UTCGHSA enrichment
  25. 2026-07-12 05:46 UTCEPSS rescore
Show 55 more
  1. 2026-07-11 20:41 UTCGHSA enrichment
  2. 2026-07-11 08:27 UTCEPSS rescore
  3. 2026-07-11 08:27 UTCEPSS rescore
  4. 2026-07-11 08:10 UTCGHSA enrichment
  5. 2026-07-10 19:39 UTCGHSA enrichment
  6. 2026-07-10 07:08 UTCGHSA enrichment
  7. 2026-07-09 19:10 UTCEPSS rescore
  8. 2026-07-09 19:10 UTCEPSS rescore
  9. 2026-07-09 18:34 UTCGHSA enrichment
  10. 2026-07-09 05:59 UTCGHSA enrichment
  11. 2026-07-08 17:24 UTCGHSA enrichment
  12. 2026-07-08 15:16 UTCEPSS rescore
  13. 2026-07-08 15:16 UTCEPSS rescore
  14. 2026-07-08 04:53 UTCGHSA enrichment
  15. 2026-07-07 16:13 UTCGHSA enrichment
  16. 2026-07-07 13:46 UTCEPSS rescore
  17. 2026-07-07 13:46 UTCEPSS rescore
  18. 2026-07-07 02:21 UTCGHSA enrichment
  19. 2026-07-06 16:27 UTCEPSS rescore
  20. 2026-07-06 16:27 UTCEPSS rescore
  21. 2026-07-06 13:50 UTCGHSA enrichment
  22. 2026-07-06 02:23 UTCEPSS rescore
  23. 2026-07-06 02:23 UTCEPSS rescore
  24. 2026-07-06 01:18 UTCGHSA enrichment
  25. 2026-07-05 12:46 UTCGHSA enrichment
  26. 2026-07-05 00:15 UTCGHSA enrichment
  27. 2026-07-04 11:42 UTCGHSA enrichment
  28. 2026-07-04 06:31 UTCEPSS rescore
  29. 2026-07-04 06:31 UTCEPSS rescore
  30. 2026-07-03 23:11 UTCGHSA enrichment
  31. 2026-07-03 10:39 UTCGHSA enrichment
  32. 2026-07-02 22:00 UTCGHSA enrichment
  33. 2026-07-02 09:29 UTCGHSA enrichment
  34. 2026-07-01 20:58 UTCGHSA enrichment
  35. 2026-07-01 15:07 UTCEPSS rescore
  36. 2026-07-01 08:28 UTCGHSA enrichment
  37. 2026-06-30 23:22 UTCEPSS rescore
  38. 2026-06-30 19:57 UTCGHSA enrichment
  39. 2026-06-30 07:26 UTCGHSA enrichment
  40. 2026-06-29 18:54 UTCGHSA enrichment
  41. 2026-06-29 06:23 UTCGHSA enrichment
  42. 2026-06-28 17:48 UTCGHSA enrichment
  43. 2026-06-28 14:07 UTCEPSS rescore
  44. 2026-06-28 05:17 UTCEG score recompute▼ 1.30
  45. 2026-06-28 05:17 UTCGHSA enrichment
  46. 2026-06-28 04:56 UTCEPSS rescore
  47. 2026-06-27 21:42 UTCNVD updateCVSS v3 → 7.5
  48. 2026-06-27 16:46 UTCGHSA enrichment
  49. 2026-06-27 04:15 UTCGHSA enrichment
  50. 2026-06-27 03:08 UTCEPSS rescore
  51. 2026-06-26 15:44 UTCEG score recompute▲ 8.80
  52. 2026-06-26 15:44 UTCGHSA enrichment
  53. 2026-06-26 15:40 UTCNVD updateCVSS v3 → 8.8 · CVSS v4 → 8.8
  54. 2026-06-25 21:46 UTCEG score recompute
  55. 2026-06-25 21:46 UTCGHSA enrichment

Frequently asked(5)

What is CVE-2026-6679?
CVE-2026-6679 is a high vulnerability published on June 25, 2026. A heap buffer overflow could occur in the DTLS 1.3 ACK serialization path before the connecting peer is authenticated. The buffer overflow was due to an integer truncation when computing the length of the ACK record-number list, causing an undersized buffer to be allocated and then overrun. This…
When was CVE-2026-6679 disclosed?
CVE-2026-6679 was first published in the National Vulnerability Database on June 25, 2026, with the most recent update on June 27, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-6679 actively exploited?
CVE-2026-6679 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 31.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-6679?
CVE-2026-6679 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-6679?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-6679, 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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