CVE-2026-66733

HIGHPre-NVD 7.57.5—
EchelonGraph scoreHIGH 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 a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 7.5Exploit: None knownExposed: 0

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

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
7.5(high)
EG Risk
49(Track)
EG Risk 49/100SSVC: 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%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
57%
KEV
Not listed

Published

August 6, 2026

Last Modified

August 6, 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 27× in last 7d / 58× 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. 2026-08-20 22:56 UTCEPSS rescore
  2. 2026-08-20 21:36 UTCGHSA enrichment
  3. 2026-08-20 09:39 UTCGHSA enrichment
  4. 2026-08-19 21:42 UTCEG score recompute
  5. 2026-08-19 21:42 UTCGHSA enrichment
  6. 2026-08-19 17:04 UTCEPSS rescore
  7. 2026-08-19 09:41 UTCGHSA enrichment
  8. 2026-08-18 21:41 UTCEG score recompute
  9. 2026-08-18 21:41 UTCGHSA enrichment
  10. 2026-08-18 13:48 UTCEPSS rescore
  11. 2026-08-18 09:20 UTCGHSA enrichment
  12. 2026-08-17 21:23 UTCEG score recompute
  13. 2026-08-17 21:23 UTCGHSA enrichment
  14. 2026-08-17 13:47 UTCEPSS rescore
  15. 2026-08-17 09:26 UTCGHSA enrichment
  16. 2026-08-16 21:29 UTCEG score recompute
  17. 2026-08-16 21:29 UTCGHSA enrichment
  18. 2026-08-16 14:56 UTCEPSS rescore
  19. 2026-08-16 09:32 UTCEG score recompute
  20. 2026-08-16 09:32 UTCGHSA enrichment
  21. 2026-08-15 21:35 UTCGHSA enrichment
  22. 2026-08-15 09:38 UTCEG score recompute
  23. 2026-08-15 09:38 UTCGHSA enrichment
  24. 2026-08-15 01:30 UTCEPSS rescore
  25. 2026-08-14 21:40 UTCGHSA enrichment
Show 33 more
  1. 2026-08-14 09:43 UTCEG score recompute
  2. 2026-08-14 09:43 UTCGHSA enrichment
  3. 2026-08-13 22:00 UTCEPSS rescore
  4. 2026-08-13 21:46 UTCGHSA enrichment
  5. 2026-08-13 09:48 UTCGHSA enrichment
  6. 2026-08-12 21:51 UTCEG score recompute
  7. 2026-08-12 21:51 UTCGHSA enrichment
  8. 2026-08-12 13:51 UTCEPSS rescore
  9. 2026-08-12 09:54 UTCGHSA enrichment
  10. 2026-08-11 21:56 UTCEG score recompute
  11. 2026-08-11 21:56 UTCGHSA enrichment
  12. 2026-08-11 09:59 UTCEG score recompute
  13. 2026-08-11 09:59 UTCGHSA enrichment
  14. 2026-08-11 00:00 UTCEPSS rescore
  15. 2026-08-10 22:02 UTCGHSA enrichment
  16. 2026-08-10 10:04 UTCGHSA enrichment
  17. 2026-08-09 22:07 UTCEG score recompute
  18. 2026-08-09 22:07 UTCGHSA enrichment
  19. 2026-08-09 13:47 UTCEPSS rescore
  20. 2026-08-09 10:10 UTCGHSA enrichment
  21. 2026-08-08 22:13 UTCEG score recompute
  22. 2026-08-08 22:13 UTCGHSA enrichment
  23. 2026-08-08 16:37 UTCEPSS rescore
  24. 2026-08-08 10:15 UTCGHSA enrichment
  25. 2026-08-07 22:18 UTCEG score recompute
  26. 2026-08-07 22:18 UTCGHSA enrichment
  27. 2026-08-07 10:21 UTCEG score recompute
  28. 2026-08-07 10:21 UTCGHSA enrichment
  29. 2026-08-06 22:24 UTCEG score recompute
  30. 2026-08-06 22:24 UTCGHSA enrichment
  31. 2026-08-06 13:36 UTCEG score recompute
  32. 2026-08-06 13:09 UTCEG score recompute
  33. 2026-08-06 13:08 UTCMITRE cvelistV5first tracked

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 in the National Vulnerability Database 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-2026-66733 actively exploited?
CVE-2026-66733 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 43.4% of all scored CVEs.
What is the CVSS score of CVE-2026-66733?
CVE-2026-66733 has a CVSS v3 base score of 7.5 (NVD).
How do I remediate CVE-2026-66733?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-66733, 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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