CVE-2026-107908

Pre-authentication heap out-of-bounds write in FalkorDB Bolt BoltReadHandler via RESET message

Published Oct 9, 2026 CVSS 4.0 · 9.3 Critical EPSS < 1% KEV · Not listed
Description
A heap-based out-of-bounds write in the BoltReadHandler function (src/bolt/bolt_api.c) in FalkorDB before 4.20.0 allows a remote unauthenticated attacker to cause a denial of service and possibly execute arbitrary code by sending a Bolt RESET message with an attacker-chosen chunk size to the Bolt port. The handler checks the size only with ASSERT(), which is compiled out in release builds, then computes a destination pointer from the wire-supplied 16-bit size and moves buffered data up to about 64 KiB backwards past the start of the read buffer. Only deployments that enable the Bolt endpoint (BOLT_PORT, disabled by default) are affected.

Remediation

Vendor Solution

Upgrade FalkorDB to version 4.20.0 or later. Bolt protocol support, including the code affected by this issue, was removed in 4.20.0.


Vendor Workaround

Leave the Bolt endpoint disabled (do not set the BOLT_PORT module configuration; it is disabled by default), or restrict network access to the Bolt port to trusted clients.

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description A heap-based out-of-bounds write in the BoltReadHandler function (src/bolt/bolt_api.c) in FalkorDB before 4.20.0 allows a remote unauthenticated attacker to cause a denial of service and possibly execute arbitrary code by sending a Bolt RESET message with an attacker-chosen chunk size to the Bolt port. The handler checks the size only with ASSERT(), which is compiled out in release builds, then computes a destination pointer from the wire-supplied 16-bit size and moves buffered data up to about 64 KiB backwards past the start of the read buffer. Only deployments that enable the Bolt endpoint (BOLT_PORT, disabled by default) are affected.
Title Pre-authentication heap out-of-bounds write in FalkorDB Bolt BoltReadHandler via RESET message
First Time appeared Falkordb
Falkordb falkordb
Weaknesses CWE-787
CPEs cpe:2.3:a:falkordb:falkordb:*:*:*:*:*:*:*:*
Vendors & Products Falkordb
Falkordb falkordb
References
Metrics cvssV3_1

{'score': 9.8, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'}

cvssV4_0

{'score': 9.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
securin
Published
Updated
Oct 15, 2026, 3:48 PM
Reserved
Oct 9, 2026, 4:54 AM
Status
Deferred
Published
Oct 9, 2026, 6:17 AM
Modified
Oct 15, 2026, 4:17 PM