CVE-2026-21087

HIGHNVD 7.87.8—
EchelonGraph scoreHIGH confidence

Score 7.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-09. NVD baseline CVSS 7.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
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.

Out-of-bounds write in libmdnie.so prior to SMR Sep-2026 Release 1 allows local attackers to execute arbitrary code with system server privilege.

CVSS v3
7.8
EG Score
7.8(high)
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
1%
KEV
Not listed

Published

September 9, 2026

Last Modified

September 11, 2026

Advisory Details (1)

Auto-updated Sep 9, 2026
No patch confirmed yet.
generic

Samsung Mobile Security

https://security.samsungmobile.com/securityUpdate.smsb?year=2026&month=09

Vendor Advisories for CVE-2026-21087(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 23× in last 7d / 64× 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. 2026-09-25 03:12 UTCGHSA enrichment
  2. 2026-09-24 14:20 UTCEG score recompute
  3. 2026-09-24 14:20 UTCGHSA enrichment
  4. 2026-09-24 14:03 UTCEPSS rescore
  5. 2026-09-24 01:17 UTCEG score recompute
  6. 2026-09-24 01:17 UTCGHSA enrichment
  7. 2026-09-23 12:26 UTCGHSA enrichment
  8. 2026-09-22 23:35 UTCEG score recompute
  9. 2026-09-22 23:35 UTCGHSA enrichment
  10. 2026-09-22 10:40 UTCGHSA enrichment
  11. 2026-09-21 21:39 UTCEG score recompute
  12. 2026-09-21 21:39 UTCGHSA enrichment
  13. 2026-09-21 08:48 UTCEG score recompute
  14. 2026-09-21 08:48 UTCGHSA enrichment
  15. 2026-09-20 20:15 UTCEPSS rescore
  16. 2026-09-20 19:54 UTCGHSA enrichment
  17. 2026-09-20 07:03 UTCGHSA enrichment
  18. 2026-09-19 18:10 UTCEG score recompute
  19. 2026-09-19 18:10 UTCGHSA enrichment
  20. 2026-09-19 05:19 UTCEG score recompute
  21. 2026-09-19 05:19 UTCGHSA enrichment
  22. 2026-09-18 19:27 UTCEPSS rescore
  23. 2026-09-18 16:28 UTCGHSA enrichment
  24. 2026-09-18 03:37 UTCEG score recompute
  25. 2026-09-18 03:37 UTCGHSA enrichment
Show 39 more
  1. 2026-09-17 14:45 UTCGHSA enrichment
  2. 2026-09-17 01:54 UTCEG score recompute
  3. 2026-09-17 01:54 UTCGHSA enrichment
  4. 2026-09-16 14:07 UTCEPSS rescore
  5. 2026-09-16 13:02 UTCEG score recompute
  6. 2026-09-16 13:02 UTCGHSA enrichment
  7. 2026-09-16 05:15 UTCEPSS rescore
  8. 2026-09-16 00:11 UTCGHSA enrichment
  9. 2026-09-15 11:20 UTCEG score recompute
  10. 2026-09-15 11:20 UTCGHSA enrichment
  11. 2026-09-14 22:29 UTCGHSA enrichment
  12. 2026-09-14 09:38 UTCGHSA enrichment
  13. 2026-09-13 20:47 UTCEG score recompute
  14. 2026-09-13 20:47 UTCGHSA enrichment
  15. 2026-09-13 16:47 UTCEPSS rescore
  16. 2026-09-13 07:55 UTCGHSA enrichment
  17. 2026-09-12 19:05 UTCEG score recompute
  18. 2026-09-12 19:05 UTCGHSA enrichment
  19. 2026-09-12 15:01 UTCEPSS rescore
  20. 2026-09-12 06:14 UTCGHSA enrichment
  21. 2026-09-11 17:23 UTCEG score recompute
  22. 2026-09-11 17:23 UTCGHSA enrichment
  23. 2026-09-11 14:52 UTCEPSS rescore
  24. 2026-09-11 04:21 UTCGHSA enrichment
  25. 2026-09-11 04:01 UTCEG score recompute
  26. 2026-09-11 04:01 UTCGHSA enrichment
  27. 2026-09-10 20:43 UTCEG score recompute▼ 0.80
  28. 2026-09-10 20:43 UTCGHSA enrichment
  29. 2026-09-10 20:42 UTCNVD updateCVSS v3 → 7.8
  30. 2026-09-10 15:23 UTCEG score recompute
  31. 2026-09-10 15:23 UTCGHSA enrichment
  32. 2026-09-10 14:55 UTCEG score recompute
  33. 2026-09-10 14:55 UTCGHSA enrichment
  34. 2026-09-10 09:34 UTCEPSS rescore
  35. 2026-09-10 04:42 UTCGHSA enrichment
  36. 2026-09-09 15:50 UTCGHSA enrichment
  37. 2026-09-09 05:25 UTCEG score recompute
  38. 2026-09-09 04:55 UTCEG score recompute
  39. 2026-09-09 04:55 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-21087?
CVE-2026-21087 is a high vulnerability published on September 9, 2026. Out-of-bounds write in libmdnie.so prior to SMR Sep-2026 Release 1 allows local attackers to execute arbitrary code with system server privilege.
When was CVE-2026-21087 disclosed?
CVE-2026-21087 was first published in the National Vulnerability Database on September 9, 2026, with the most recent update on September 11, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-21087 actively exploited?
CVE-2026-21087 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 98.5% of all scored CVEs.
What is the CVSS score of CVE-2026-21087?
CVE-2026-21087 has a CVSS v3 base score of 7.8 (NVD).
How do I remediate CVE-2026-21087?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-21087, 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

Explore the affected products and dependency analysis for CVE-2026-21087

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