CVE-2026-8720

HIGHNVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory published 2026-06-26. NVD baseline CVSS 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.5Exploit: None knownExposed: 0

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

wc_Blake2bHmacFinal and wc_Blake2sHmacFinal discard the message when the key length exceeds the block size, producing a MAC that is independent of the input. When the supplied key is longer than the BLAKE2 block size the key-hashing branch reinitialized the running hash state, discarding the accumulated message data, so the resulting MAC depended only on the key and not on the message being authenticated. This bug is specific to the HMAC-BLAKE2 APIs that were added in wolfSSL version 5.9.0.

CVSS v3
7.5
EG Score
7.5(medium)
EG Risk
38(Track)
EG Risk 38/100SSVC: 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
Severity75% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
5%
KEV
Not listed

Published

June 25, 2026

Last Modified

June 27, 2026

Advisory Details (2)

Auto-updated Jun 25, 2026
Patch available. Sources: github_pr.
generic Patch Available

wolfSSL Security Vulnerabilities | Documentation - wolfSSL

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

Fix Blake2 oversized key path

Fix merged in wolfSSL/wolfssl PR #10447 on 2026-05-12 — awaiting tagged release

https://github.com/wolfSSL/wolfssl/pull/10447

Vendor Advisories for CVE-2026-8720(2)

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 22× in last 7d / 102× 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 180 total refreshes for this CVE.

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

Frequently asked(5)

What is CVE-2026-8720?
CVE-2026-8720 is a high vulnerability published on June 25, 2026. wcBlake2bHmacFinal and wcBlake2sHmacFinal discard the message when the key length exceeds the block size, producing a MAC that is independent of the input. When the supplied key is longer than the BLAKE2 block size the key-hashing branch reinitialized the running hash state, discarding the…
When was CVE-2026-8720 disclosed?
CVE-2026-8720 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-2026-8720 actively exploited?
CVE-2026-8720 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 94.8% of all scored CVEs.
What is the CVSS score of CVE-2026-8720?
CVE-2026-8720 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-8720?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-8720, 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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