CVE-2026-88409

HIGHPre-NVD 8.88.8—
EchelonGraph scoreHIGH confidence

Score 8.8 from GitHub Security Advisory (severity: HIGH) published 2026-09-21. A secondary CVSS source baseline 8.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this week
8.8EG
EchelonGraph verdictPlan mitigationSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.5%CVSS: 8.8Exploit: None knownExposed services: Not assessed

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

FalkorDB (Redis module) v4.20.1 to v4.20.4 was discovered to contain a buffer overflow in the _Decode_GrB_Matrix function (/v19/decode_matrix.c). This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted input.

CVSS v3
8.8
EG Score
8.8HIGHhigh confidence
EG Risk
40
EG Risk 40/100CISA 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
Severity88% × 45%
Exploitation0% × 40%
Automatability0% × 15%
CISA SSVC: Track at every mission impact level.
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.
EPSS PROB
0.5%
EPSS %ILE
38th
KEV
Not listed

CISA SSVCTrack at every mission impact level.

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation within your standard update timelines, and watch the vendor's advisory for the fix.

Exploitation none (CISA Vulnrichment) · Automatable no (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

September 21, 2026

Last Modified

September 22, 2026

Advisory Details (1)

Auto-updated Sep 21, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Type confusion in GraphBLAS container decode: unvalidated buffer length reinterpreted as GxB_Container · Issue #2399 · FalkorDB/FalkorDB · GitHub

https://github.com/FalkorDB/FalkorDB/issues/2399

Vendor Advisories for CVE-2026-88409(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 / 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. 2026-10-04 02:07 UTCEG score recompute
  2. 2026-10-04 02:07 UTCGHSA enrichment
  3. 2026-10-03 13:54 UTCGHSA enrichment
  4. 2026-10-03 01:40 UTCEG score recompute
  5. 2026-10-03 01:40 UTCGHSA enrichment
  6. 2026-10-02 13:26 UTCGHSA enrichment
  7. 2026-10-02 01:14 UTCEG score recompute
  8. 2026-10-02 01:14 UTCGHSA enrichment
  9. 2026-10-01 19:51 UTCEPSS rescore
  10. 2026-10-01 13:01 UTCGHSA enrichment
  11. 2026-10-01 00:48 UTCEG score recompute
  12. 2026-10-01 00:48 UTCGHSA enrichment
  13. 2026-09-30 15:04 UTCEPSS rescore
  14. 2026-09-30 12:35 UTCGHSA enrichment
  15. 2026-09-30 00:21 UTCEG score recompute
  16. 2026-09-30 00:21 UTCGHSA enrichment
  17. 2026-09-29 12:06 UTCGHSA enrichment
  18. 2026-09-28 23:53 UTCEG score recompute
  19. 2026-09-28 23:53 UTCGHSA enrichment
  20. 2026-09-28 13:52 UTCEPSS rescore
  21. 2026-09-28 11:39 UTCGHSA enrichment
  22. 2026-09-27 23:25 UTCEG score recompute
  23. 2026-09-27 23:25 UTCGHSA enrichment
  24. 2026-09-27 13:48 UTCEPSS rescore
  25. 2026-09-27 11:11 UTCGHSA enrichment
Show 26 more
  1. 2026-09-26 22:56 UTCEG score recompute
  2. 2026-09-26 22:56 UTCGHSA enrichment
  3. 2026-09-26 15:59 UTCEPSS rescore
  4. 2026-09-26 10:42 UTCEG score recompute
  5. 2026-09-26 10:41 UTCGHSA enrichment
  6. 2026-09-25 22:17 UTCGHSA enrichment
  7. 2026-09-25 09:42 UTCGHSA enrichment
  8. 2026-09-24 21:29 UTCEG score recompute
  9. 2026-09-24 21:29 UTCGHSA enrichment
  10. 2026-09-24 14:04 UTCEPSS rescore
  11. 2026-09-24 08:51 UTCGHSA enrichment
  12. 2026-09-23 20:38 UTCEG score recompute
  13. 2026-09-23 20:38 UTCGHSA enrichment
  14. 2026-09-23 17:54 UTCEPSS rescore
  15. 2026-09-23 08:25 UTCGHSA enrichment
  16. 2026-09-22 20:12 UTCEG score recompute
  17. 2026-09-22 20:12 UTCGHSA enrichment
  18. 2026-09-22 16:01 UTCEPSS rescore
  19. 2026-09-22 14:20 UTCEG score recompute
  20. 2026-09-22 14:20 UTCGHSA enrichment
  21. 2026-09-22 13:51 UTCEG score recompute
  22. 2026-09-22 13:51 UTCGHSA enrichment
  23. 2026-09-22 09:30 UTCEG score recompute
  24. 2026-09-22 09:30 UTCGHSA enrichment
  25. 2026-09-21 21:17 UTCEG score recompute
  26. 2026-09-21 21:16 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88409?
CVE-2026-88409 is a high vulnerability published on September 21, 2026. FalkorDB (Redis module) v4.20.1 to v4.20.4 was discovered to contain a buffer overflow in the DecodeGrBMatrix function (/v19/decodematrix.c). This vulnerability allows attackers to cause a Denial of Service (DoS) via a crafted input.
When was CVE-2026-88409 disclosed?
CVE-2026-88409 was first published on September 21, 2026, with the most recent update on September 22, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88409 actively exploited?
CVE-2026-88409 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.5% probability of exploitation in the next 30 days (38th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-88409?
CVE-2026-88409 has a CVSS base score of 8.8 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-88409?
No fix for CVE-2026-88409 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2026-88409 are linked in the Vendor Advisories panel on this page.

Dependency Blast Radius

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