CVE-2026-4395

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: LOW) published 2026-03-19. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: None knownExposed: 0

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

Heap-based buffer overflow in the KCAPI ECC code path of wc_ecc_import_x963_ex() in wolfSSL wolfcrypt allows a remote attacker to write attacker-controlled data past the bounds of the pubkey_raw buffer via a crafted oversized EC public key point. The WOLFSSL_KCAPI_ECC code path copies the input to key->pubkey_raw (132 bytes) using XMEMCPY without a bounds check, unlike the ATECC code path which includes a length validation. This can be triggered during TLS key exchange when a malicious peer sends a crafted ECPoint in ServerKeyExchange.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
44(Track)
EG Risk 44/100SSVC: 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
Severity98% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
28%
KEV
Not listed

Published

March 19, 2026

Last Modified

June 17, 2026

Advisory Details (1)

Auto-updated Sep 14, 2026
Upstream fix merged — awaiting tagged release. Sources: github_pr.
github_pr

Check raw pubkey length in wc_ecc_import_x963 before copying to it for KCAPI case.

Fix merged in wolfSSL/wolfssl PR #9988 on 2026-03-17 — awaiting tagged release

https://github.com/wolfSSL/wolfssl/pull/9988

Vendor Advisories for CVE-2026-4395(1)

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

Affected Packages

(3 across 3 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
wolfssl4.6.0+p1-0+deb11u1 ... 5.9.2-1 (40 versions)——
Debian:12(1)
PackageVulnerable rangeFixed inDependents
wolfssl5.5.4-2 ... 5.9.2-1 (27 versions)——
Debian:13(1)
PackageVulnerable rangeFixed inDependents
wolfssl5.7.2-0.1 ... 5.9.2-1 (14 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

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

Frequently asked(5)

What is CVE-2026-4395?
CVE-2026-4395 is a critical vulnerability published on March 19, 2026. Heap-based buffer overflow in the KCAPI ECC code path of wceccimportx963ex() in wolfSSL wolfcrypt allows a remote attacker to write attacker-controlled data past the bounds of the pubkeyraw buffer via a crafted oversized EC public key point. The WOLFSSLKCAPIECC code path copies the input to…
When was CVE-2026-4395 disclosed?
CVE-2026-4395 was first published in the National Vulnerability Database on March 19, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-4395 actively exploited?
CVE-2026-4395 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 72.0% of all scored CVEs.
What is the CVSS score of CVE-2026-4395?
CVE-2026-4395 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2026-4395?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-4395, 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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