CVE-2026-21366

HIGHPre-NVD 7.87.8—
EchelonGraph scoreMEDIUM confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-08-04. a secondary CVSS source baseline 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 7.8Exploit: None knownExposed: 0

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

Memory corruption while processing a packet with a size close to the maximum allowed value.

CVSS v3
7.8
EG Score
7.8(medium)
EG Risk
35(Track)
EG Risk 35/100SSVC: 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
Severity78% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
0%
KEV
Not listed

Published

August 4, 2026

Last Modified

August 6, 2026

Advisory Details (1)

Auto-updated Aug 4, 2026
No patch confirmed yet.
generic

Qualcomm Documentation

https://docs.qualcomm.com/product/publicresources/securitybulletin/august-2026-bulletin.html

Vendor Advisories for CVE-2026-21366(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 17× in last 7d / 73× 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 130 total refreshes for this CVE.

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

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-21366?
CVE-2026-21366 is a high vulnerability published on August 4, 2026. Memory corruption while processing a packet with a size close to the maximum allowed value.
When was CVE-2026-21366 disclosed?
CVE-2026-21366 was first published in the National Vulnerability Database on August 4, 2026, with the most recent update on August 6, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21366 actively exploited?
CVE-2026-21366 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 100.0% of all scored CVEs.
What is the CVSS score of CVE-2026-21366?
CVE-2026-21366 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-21366?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21366, 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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