CVE-2026-76763 Io.smallrye/smallrye-graphql: smallrye graphql: unauthenticated denial of service via large exponent float literals
An unauthenticated attacker can cause denial of service in SmallRye GraphQL by sending queries with large exponent float literals, exhausting CPU or memory resources.
- 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-2026-76763?
CVE-2026-76763 is a high-severity denial of service vulnerability in Red Hat build of Quarkus 3.27.5.SP1, published on 31 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A flaw was found in SmallRye GraphQL. The number scalar coercion for BigInteger does not properly validate the magnitude of float or string inputs. An unauthenticated remote attacker can exploit this by sending a GraphQL query containing a large exponent float literal. This can lead to the allocation of extremely large BigInteger objects, causing CPU exhaustion or an OutOfMemoryError, resulting in a denial of service.
Weakness: CWE-1284
Which versions are affected by CVE-2026-76763?
How do I fix CVE-2026-76763?
No fix has been published for CVE-2026-76763 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-2026-76763 being exploited?
There is no known exploitation of CVE-2026-76763 in the wild and no public exploit code.