CVE-2026-107909

CRITICALPre-NVD 9.19.1—
EchelonGraph scoreHIGH confidence

Score 9.1 from GitHub Security Advisory (severity: HIGH) published 2026-10-09. A secondary CVSS source baseline 9.1; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 4 sources updated this week
9.1EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines at low or medium mission impact and sooner than that at high (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0.4%CVSS: 9.1Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

A heap-based out-of-bounds write in the ws_read_frame function (src/bolt/ws.c) and the buffer_apply_mask function (src/bolt/buffer.c) in FalkorDB before 4.20.0 allows a remote unauthenticated attacker to cause a denial of service and possibly corrupt heap memory by sending a WebSocket frame with a 64-bit extended payload length to the Bolt port. The payload length is not bounded, and the only bounds check in buffer_apply_mask is an ASSERT(), which is compiled out in release builds, so the function XORs memory beyond the end of the receive buffer with the attacker-supplied mask key. Only deployments that enable the Bolt endpoint (BOLT_PORT, disabled by default) are affected.

CVSS v3
9.1
EG Score
9.1CRITICALhigh confidence
EG Risk
46
EG Risk 46/100

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 (value × EchelonGraph’s weight)
Severity91% × 45%
The EG Score, 9.1 of 10.
Exploitation0% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability30% × 15%
EchelonGraph's default: CISA has not published Automatable for this CVE.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).
Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
0.4%
EPSS %ILE
35th
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact total (CVSS ≥ 9.0). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

Published

October 9, 2026

Last Modified

October 9, 2026

Advisory Details (3)

Auto-updated Oct 9, 2026
Patch available. Sources: github_pr, github_commit, github_release.
github_release Patch Available

v4.20.0

Patch available: FalkorDB/FalkorDB v4.20.0

https://github.com/FalkorDB/FalkorDB/releases/tag/v4.20.0
github_commit

commit 0b11a00b34b2 (FalkorDB/FalkorDB)

Fix landed in FalkorDB/FalkorDB commit 0b11a00b34b2 — awaiting tagged release

https://github.com/FalkorDB/FalkorDB/commit/0b11a00b34b25c4d4fdfe55f0a35c8a00593bd7d
github_pr

remove bolt support

Fix merged in FalkorDB/FalkorDB PR #2170 on 2026-07-08 — awaiting tagged release

https://github.com/FalkorDB/FalkorDB/pull/2170

Vendor Advisories for CVE-2026-107909(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 22× in last 7d / 22× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

  1. 2026-10-11 12:01 UTCEG score recompute
  2. 2026-10-11 12:01 UTCGHSA enrichmentGHSA-x67x-q5pm-p9h7 · GitHub severity HIGH · GitHub CVSS 9.1
  3. 2026-10-11 07:55 UTCGHSA enrichmentGHSA-x67x-q5pm-p9h7 · GitHub severity HIGH · GitHub CVSS 9.1
  4. 2026-10-11 03:50 UTCGHSA enrichmentGHSA-x67x-q5pm-p9h7 · GitHub severity HIGH · GitHub CVSS 9.1
  5. 2026-10-10 23:46 UTCEG score recompute
  6. 2026-10-10 23:46 UTCGHSA enrichmentGHSA-x67x-q5pm-p9h7 · GitHub severity HIGH · GitHub CVSS 9.1
  7. 2026-10-10 19:59 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  8. 2026-10-10 19:43 UTCGHSA enrichmentGHSA-x67x-q5pm-p9h7 · GitHub severity HIGH · GitHub CVSS 9.1
  9. 2026-10-10 15:40 UTCGHSA enrichmentGHSA-x67x-q5pm-p9h7 · GitHub severity HIGH · GitHub CVSS 9.1
  10. 2026-10-10 11:37 UTCGHSA enrichmentGHSA-x67x-q5pm-p9h7 · GitHub severity HIGH · GitHub CVSS 9.1
  11. 2026-10-10 07:34 UTCGHSA enrichmentGHSA-x67x-q5pm-p9h7 · GitHub severity HIGH · GitHub CVSS 9.1
  12. 2026-10-10 03:29 UTCGHSA enrichmentGHSA-x67x-q5pm-p9h7 · GitHub severity HIGH · GitHub CVSS 9.1
  13. 2026-10-09 23:27 UTCEG score recompute
  14. 2026-10-09 23:27 UTCGHSA enrichmentGHSA-x67x-q5pm-p9h7 · GitHub severity HIGH · GitHub CVSS 9.1
  15. 2026-10-09 20:06 UTCEPSS rescoreEPSS 0.4% · 35th percentile
  16. 2026-10-09 19:23 UTCGHSA enrichmentGHSA-x67x-q5pm-p9h7 · GitHub severity HIGH · GitHub CVSS 9.1
  17. 2026-10-09 15:21 UTCGHSA enrichmentGHSA-x67x-q5pm-p9h7 · GitHub severity HIGH · GitHub CVSS 9.1
  18. 2026-10-09 11:17 UTCEG score recompute
  19. 2026-10-09 11:17 UTCGHSA enrichmentGHSA-x67x-q5pm-p9h7 · GitHub severity HIGH · GitHub CVSS 9.1
  20. 2026-10-09 06:27 UTCEG score recompute
  21. 2026-10-09 05:24 UTCEG score recompute
  22. 2026-10-09 05:23 UTCMITRE cvelistV5first tracked

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Frequently asked(5)

What is CVE-2026-107909?
CVE-2026-107909 is a critical vulnerability published on October 9, 2026. A heap-based out-of-bounds write in the wsreadframe function (src/bolt/ws.c) and the bufferapplymask function (src/bolt/buffer.c) in FalkorDB before 4.20.0 allows a remote unauthenticated attacker to cause a denial of service and possibly corrupt heap memory by sending a WebSocket frame with a…
When was the CVE record for CVE-2026-107909 published?
The CVE record for CVE-2026-107909 was published on October 9, 2026. That is the record's publication date; the vulnerability itself may have been made public earlier. EchelonGraph's copy of the record carries a last-modified date of October 9, 2026; the record at its source may have been updated since.
Is CVE-2026-107909 actively exploited?
CVE-2026-107909 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0.4% probability of exploitation in the next 30 days (35th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2026-107909?
CVE-2026-107909 has a CVSS base score of 9.1 (a secondary CVSS source that NVD displays; NVD's own analysis pending).
How do I remediate CVE-2026-107909?
A fix for CVE-2026-107909 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2026-107909 are linked in the Vendor Advisories panel on this page.

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