CVE-2026-103472 restbed through 5.0.0 WebSocket Memory Exhaustion via Unbounded Frame Buffering
Remote attackers can crash the restbed server by sending WebSocket frames with large declared payload sizes, exhausting memory.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-103472?
CVE-2026-103472 is a high-severity denial of service vulnerability in Corvusoft restbed, published on 30 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
restbed through 5.0.0 accepts WebSocket frames with declared payload lengths up to 2^63 bytes and buffers the payload without size limits in an unbounded stream buffer. Remote unauthenticated attackers can declare large frame sizes and stream payload data to exhaust server memory, causing denial of service through process crash.
Weakness: CWE-770
Which versions are affected by CVE-2026-103472?
How do I fix CVE-2026-103472?
No fix has been published for CVE-2026-103472 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-103472 being exploited?
There is no known exploitation of CVE-2026-103472 in the wild and no public exploit code.
Sources
Also known as GHSA-x9gv-qwcx-36wm.