CVE-2026-109338 SurrealDB before 3.3.0 Denial of Service via Headers Non-ASCII Values
Attackers with scripting enabled can crash the SurrealDB server by reading non-ASCII header values in embedded JavaScript.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-109338?
CVE-2026-109338 is a high-severity denial of service vulnerability in surrealdb, published on 12 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
SurrealDB before 3.3.0 contains a denial of service vulnerability that allows query-capable users to crash the server by reading non-ASCII header values in embedded JavaScript. Attackers with scripting enabled can read such values via Headers get(), entries(), values(), or getSetCookie(), or return them from fetch() endpoints, aborting the server process.
Weakness: CWE-248
Which versions are affected by CVE-2026-109338?
How do I fix CVE-2026-109338?
No fix has been published for CVE-2026-109338 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-2026-109338 being exploited?
There is no known exploitation of CVE-2026-109338 in the wild and no public exploit code.
Sources
Also known as GHSA-5834-qg2f-g3j7.