CVE-2026-107909
A heap-based out-of-bounds write in the ws_read_frame function (src/bolt/ws.c) and the…
- Risk score
- 67/100
- CVSS
- 9.1 v3.1
- Exploit chance (30 days)
- 0.4%
- Published
- 9 Oct 2026
Open in the live forecast Today's forecast
What to know
- What it is
- 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 payl…
- Affected
- See advisory
- Fix
- Upgrade the product to 4.20 or 4.20.0 (whichever matches your release line), or later.
- Exploitation
- No known exploitation
Why it is Amber
- CVSS 9.1 critical
- Remotely exploitable without logging in
References
Original description
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.
Last activity 9 Oct 2026. Patch Forecast updates every hour.