CVE-2026-122096 Apache DataSketches Java: Uncontrolled resource consumption when deserializing crafted sketch images
Crafted serialized sketches can exhaust memory or cause infinite loops in applications deserializing untrusted sketches with Apache DataSketches Java.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Harmful if only installed
- No
- Needs a specific call
- Yes
- Fix
- None listed
What is CVE-2026-122096?
CVE-2026-122096 is a denial of service vulnerability in Apache DataSketches Java, published on 11 Nov 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Uncontrolled Resource Consumption vulnerability in the sketch deserialization of Apache DataSketches Java.
Several deserializers trusted sizes and counts declared in the serialized input. A small crafted input could make an application allocate an excessive amount of memory, leading to an OutOfMemoryError. A crafted string passed to FrequentLongsSketch.getInstance(String) could also make deserialization, or a later update, loop indefinitely. Only applications that deserialize sketches from untrusted sources are affected.
This issue affects Apache DataSketches Java: through 9.0.0.
Users are recommended to upgrade to version 9.1.0, which fixes the issue.
Which versions are affected by CVE-2026-122096?
An affected version is only exploitable if your software calls FrequentLongsSketch.getInstance. Many projects that include it are not exposed.
How do I fix CVE-2026-122096?
No fix has been published for CVE-2026-122096 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-2026-122096 being exploited?
There is no known exploitation of CVE-2026-122096 in the wild and no public exploit code.
Sources
Also known as GHSA-jghc-rj2j-x37x.