CVE-2026-20491

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 med, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS10981478 (Note: For MT6890, MT6990, MT6988) / AUTO00851173 (Note: For MT2735, MT2737); Issue ID: MSV-7652.

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 19, 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-2026-20491(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 18× 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 17:38 UTCEG score recompute
  3. 2026-08-20 17:38 UTCGHSA enrichment
  4. 2026-08-19 17:03 UTCEPSS rescore
  5. 2026-08-19 15:29 UTCGHSA enrichment
  6. 2026-08-18 14:56 UTCGHSA enrichment
  7. 2026-08-17 23:02 UTCEG score recompute
  8. 2026-08-17 23:02 UTCGHSA enrichment
  9. 2026-08-17 13:47 UTCEPSS rescore
  10. 2026-08-16 20:53 UTCEG score recompute
  11. 2026-08-16 20:53 UTCGHSA enrichment
  12. 2026-08-16 14:56 UTCEPSS rescore
  13. 2026-08-16 02:14 UTCEPSS rescore
  14. 2026-08-15 18:45 UTCEG score recompute
  15. 2026-08-15 18:45 UTCGHSA enrichment
  16. 2026-08-15 01:30 UTCEPSS rescore
  17. 2026-08-14 16:37 UTCEG score recompute
  18. 2026-08-14 16:37 UTCGHSA enrichment
  19. 2026-08-13 22:00 UTCEPSS rescore
  20. 2026-08-13 14:29 UTCEG score recompute
  21. 2026-08-13 14:29 UTCGHSA enrichment
  22. 2026-08-12 13:50 UTCEPSS rescore
  23. 2026-08-12 12:21 UTCEG score recompute
  24. 2026-08-12 12:21 UTCGHSA enrichment
  25. 2026-08-11 13:42 UTCEPSS rescore
Show 26 more
  1. 2026-08-11 10:13 UTCEG score recompute
  2. 2026-08-11 10:13 UTCGHSA enrichment
  3. 2026-08-11 00:00 UTCEPSS rescore
  4. 2026-08-10 08:05 UTCGHSA enrichment
  5. 2026-08-09 05:58 UTCEG score recompute
  6. 2026-08-09 05:58 UTCGHSA enrichment
  7. 2026-08-08 16:37 UTCEPSS rescore
  8. 2026-08-08 03:50 UTCEG score recompute
  9. 2026-08-08 03:50 UTCGHSA enrichment
  10. 2026-08-07 01:42 UTCEG score recompute
  11. 2026-08-07 01:42 UTCGHSA enrichment
  12. 2026-08-06 13:46 UTCEPSS rescore
  13. 2026-08-05 23:34 UTCEG score recompute
  14. 2026-08-05 23:34 UTCGHSA enrichment
  15. 2026-08-05 19:17 UTCEPSS rescore
  16. 2026-08-04 21:27 UTCEG score recompute
  17. 2026-08-04 21:26 UTCGHSA enrichment
  18. 2026-08-04 15:10 UTCEPSS rescore
  19. 2026-08-04 10:38 UTCEPSS rescore
  20. 2026-08-03 19:18 UTCGHSA enrichment
  21. 2026-08-03 19:04 UTCEG score recompute▲ 5.50
  22. 2026-08-03 19:04 UTCGHSA enrichment
  23. 2026-08-03 19:03 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-2026-20491?
CVE-2026-20491 is a medium vulnerability published on August 3, 2026. In med, there is a possible out of bounds write due to an incorrect bounds check. This could lead to local denial of service with User execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS10981478 (Note: For MT6890, MT6990, MT6988) / AUTO00851173 (Note: For…
When was CVE-2026-20491 disclosed?
CVE-2026-20491 was first published in the National Vulnerability Database on August 3, 2026, with the most recent update on August 19, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-20491 actively exploited?
CVE-2026-20491 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 98.9% of all scored CVEs.
What is the CVSS score of CVE-2026-20491?
CVE-2026-20491 has a CVSS v3.1 base score of 5.5 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2026-20491?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-20491, 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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