Pre-authentication heap out-of-bounds write in FalkorDB Bolt WebSocket frame handling via unbounded payload length
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.
CVE-2026-107909
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-107909
FalkorDB
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"cpes": [
"cpe:2.3:a:falkordb:falkordb:*:*:*:*:*:*:*:*"
],
"repo": "https://github.com/FalkorDB/FalkorDB",
"vendor": "FalkorDB",
"modules": [
"Bolt protocol endpoint"
],
"product": "FalkorDB",
"versions": [
{
"status": "affected",
"version": "0",
"lessThan": "4.20.0",
"versionType": "semver"
}
],
"programFiles": [
"src/bolt/ws.c",
"src/bolt/buffer.c"
],
"collectionURL": "https://github.com/FalkorDB/FalkorDB",
"defaultStatus": "unaffected",
"programRoutines": [
{
"name": "ws_read_frame"
},
{
"name": "buffer_apply_mask"
}
]
}
]- Related CVEs
- CVE-2026-107909
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #29197 · Revision 1
- Added to Heist Feed
- Publisher date