CVE-2026-66733

HIGHPre-NVD 7.57.5—
EchelonGraph scoreMEDIUM confidence

Score 7.5 from GitHub Security Advisory (severity: HIGH) published 2026-08-06. A secondary CVSS source baseline 7.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
7.5EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.6%CVSS: 7.5Exploit: None knownExposed services: Not assessed

An upstream fix is merged but not yet released — mitigate (WAF / firewall / segmentation) until the release ships, then apply it.

Sonic 3 A.I.R. before commit 2492d18 contains an unbounded memory allocation vulnerability in ReceivedPacketCache::enqueuePacket() that allows unauthenticated remote attackers to crash the server process by sending a crafted UDP packet with mUniquePacketID set to the maximum uint32 value. The mUniquePacketID field is read directly from the UDP wire-format packet header without bounds checking, causing the server to allocate one CacheItem per missing packet ID gap, exhausting available host memory and propagating an uncaught std::bad_alloc exception to std::terminate().

CVSS v3
7.5
EG Score
7.5HIGHmedium confidence
EG Risk
49
EG Risk 49/100CISA SSVC

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%
Exploitation2% × 40%
Automatability100% × 15%
CISA SSVC: Track at low or medium mission impact; Attend at high (mission-essential systems).
Action: An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.
EPSS PROB
1.6%
EPSS %ILE
74th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Attend at high (mission-essential systems).

An upstream fix is merged but not yet in a tagged release. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines at low or medium mission impact and sooner than that at high until it ships, then apply the release.

Exploitation none (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 6, 2026

Last Modified

September 24, 2026

Advisory Details (2)

Auto-updated Aug 6, 2026
Upstream fix merged — awaiting tagged release. Sources: github_commit.
generic

Sonic 3 A.I.R. Unbounded Memory Allocation DoS via ReceivedPacketCache | Advisories | VulnCheck

https://www.vulncheck.com/advisories/sonic-3-a-i-r-unbounded-memory-allocation-dos-via-receivedpacketcache
github_commit

commit 2492d1882cd2 (Eukaryot/sonic3air)

Fix landed in Eukaryot/sonic3air commit 2492d1882cd2 — awaiting tagged release

https://github.com/Eukaryot/sonic3air/commit/2492d1882cd2cf1cc1d7415729ce5c4fd686cd4f

Vendor Advisories for CVE-2026-66733(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 16× in last 7d / 86× 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 195 total refreshes for this CVE.

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

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Frequently asked(5)

What is CVE-2026-66733?
CVE-2026-66733 is a high vulnerability published on August 6, 2026. Sonic 3 A.I.R. before commit 2492d18 contains an unbounded memory allocation vulnerability in ReceivedPacketCache::enqueuePacket() that allows unauthenticated remote attackers to crash the server process by sending a crafted UDP packet with mUniquePacketID set to the maximum uint32 value. The…
When was CVE-2026-66733 disclosed?
CVE-2026-66733 was first published on August 6, 2026, with the most recent update on September 24, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-66733 actively exploited?
CVE-2026-66733 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.6% probability of exploitation in the next 30 days (74th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-66733?
CVE-2026-66733 has a CVSS base score of 7.5 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-66733?
An upstream fix for CVE-2026-66733 has been merged but is not yet in a tagged release. Until it ships, restrict network exposure of the affected system or apply the vendor's mitigation, then update to the release that contains the fix. The vendor advisories EchelonGraph has for CVE-2026-66733 are linked in the Vendor Advisories panel on this page.

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