CVE-2026-122096: Apache DataSketches Java unsafe deserialization
This Apache advisory covers CVE-2026-122096 in Apache DataSketches Java.
- CVE-2026-122096
Key facts
- Vendor rating
- Low
- Weakness
- CWE-400
- CWE-789 Memory allocation with excessive size value
- CWE-835 Loop with unreachable exit condition ('infinite loop')
- CISA KEV
- Not listed (catalogue checked )
- Affected
- through 9.0.0
- Fixed in
- 9.1.0
- Source published
- Source revised
- Listed by VulniPulse
Compiled by VulniPulse from the linked sources. How records are collected and checked.
Affected products & platforms
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.
Text from the source record.
How to fix CVE-2026-122096
Upgrade to a fixed release named by Apache:
- 9.1.0
Vendor guidance
- A crafted string passed to FrequentLongsSketch.getInstance(String) could also make deserialization, or a later update, loop indefinitely.
- Users are recommended to upgrade to version 9.1.0, which fixes the issue.
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