CVE-2026-20478

MEDIUMPre-NVD 5.55.5—
EchelonGraph scoreHIGH confidence

Score 5.5 from GitHub Security Advisory published 2026-08-03. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

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

In Audio HAL, there is a possible out of bounds write due to a heap buffer overflow. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS10981454 (Note: For MT6880, MT6890, MT6988, MT6990) / AUTO00851293 (Note: For MT2735, MT2737); Issue ID: MSV-7638.

CVSS v3
5.5
EG Score
5.5(high)
EG Risk
25(Track)
EG Risk 25/100SSVC: 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
Severity55% × 45%
Exploitation0% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
1%
KEV
Not listed

Published

August 3, 2026

Last Modified

August 20, 2026

Advisory Details (1)

Auto-updated Aug 3, 2026
⚠️ Active exploitation confirmed. No patch confirmed yet.
generic🔴 Active Exploitation

August 2026 MediaTek Security Bulletin

https://www.mediatek.com/product-security-bulletin/August-2026

Vendor Advisories for CVE-2026-20478(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 19× in last 7d / 51× 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 22:55 UTCEPSS rescore
  2. 2026-08-20 15:07 UTCEG score recompute
  3. 2026-08-20 15:07 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 15:21 UTCGHSA enrichment
  6. 2026-08-18 14:56 UTCEG score recompute
  7. 2026-08-18 14:56 UTCGHSA enrichment
  8. 2026-08-18 13:48 UTCEPSS rescore
  9. 2026-08-18 00:21 UTCEG score recompute
  10. 2026-08-18 00:20 UTCGHSA enrichment
  11. 2026-08-17 13:47 UTCEPSS rescore
  12. 2026-08-16 23:59 UTCEG score recompute
  13. 2026-08-16 23:59 UTCGHSA enrichment
  14. 2026-08-16 14:56 UTCEPSS rescore
  15. 2026-08-16 02:14 UTCEPSS rescore
  16. 2026-08-15 23:43 UTCEG score recompute
  17. 2026-08-15 23:43 UTCGHSA enrichment
  18. 2026-08-15 01:30 UTCEPSS rescore
  19. 2026-08-14 23:26 UTCGHSA enrichment
  20. 2026-08-13 23:09 UTCGHSA enrichment
  21. 2026-08-12 22:52 UTCEG score recompute
  22. 2026-08-12 22:52 UTCGHSA enrichment
  23. 2026-08-12 13:50 UTCEPSS rescore
  24. 2026-08-11 22:36 UTCEG score recompute
  25. 2026-08-11 22:36 UTCGHSA enrichment
Show 26 more
  1. 2026-08-11 13:42 UTCEPSS rescore
  2. 2026-08-11 00:00 UTCEPSS rescore
  3. 2026-08-10 22:20 UTCGHSA enrichment
  4. 2026-08-09 22:03 UTCGHSA enrichment
  5. 2026-08-08 21:47 UTCEG score recompute
  6. 2026-08-08 21:47 UTCGHSA enrichment
  7. 2026-08-08 16:37 UTCEPSS rescore
  8. 2026-08-07 21:31 UTCEG score recompute
  9. 2026-08-07 21:31 UTCGHSA enrichment
  10. 2026-08-06 21:14 UTCEG score recompute
  11. 2026-08-06 21:14 UTCGHSA enrichment
  12. 2026-08-06 13:46 UTCEPSS rescore
  13. 2026-08-05 20:58 UTCEG score recompute
  14. 2026-08-05 20:58 UTCGHSA enrichment
  15. 2026-08-05 19:17 UTCEPSS rescore
  16. 2026-08-04 20:42 UTCEG score recompute
  17. 2026-08-04 20:41 UTCGHSA enrichment
  18. 2026-08-04 15:10 UTCEPSS rescore
  19. 2026-08-04 10:38 UTCEPSS rescore
  20. 2026-08-03 20:20 UTCGHSA enrichment
  21. 2026-08-03 19:38 UTCEG score recompute▲ 5.50
  22. 2026-08-03 19:38 UTCGHSA enrichment
  23. 2026-08-03 19:38 UTCMITRE cvelistV5CVSS v3 → 5.5 · severity → MEDIUM
  24. 2026-08-03 03:23 UTCNVD update
  25. 2026-08-03 02:44 UTCEG score recompute
  26. 2026-08-03 02:43 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-20478?
CVE-2026-20478 is a medium vulnerability published on August 3, 2026. In Audio HAL, there is a possible out of bounds write due to a heap buffer overflow. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS10981454 (Note: For MT6880, MT6890, MT6988, MT6990) / AUTO00851293…
When was CVE-2026-20478 disclosed?
CVE-2026-20478 was first published in the National Vulnerability Database on August 3, 2026, with the most recent update on August 20, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20478 actively exploited?
CVE-2026-20478 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 98.8% of all scored CVEs.
What is the CVSS score of CVE-2026-20478?
CVE-2026-20478 has a CVSS v3.1 base score of 5.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-20478?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20478, 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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