JVM memory exhaustion via unchecked compressed length
Published Jul 4, 2026 · Updated Jul 4, 2026
Uncontrolled allocation in HdrHistogram 2.2.0 through 2.2.2 allows local users to exhaust JVM memory via a crafted direct buffer. AbstractHistogram.decodeFromCompressedByteBuffer reads lengthOfCompressedContents from the buffer and passes it directly to a byte-array allocation when the ByteBuffer is not array-backed, without checking the remaining data. Reachability requires a consuming application to pass attacker-influenced compressed histogram data in a direct buffer; the project closed the report as bogus, and the CVE record is disputed.
Summary
What happened
Uncontrolled allocation in HdrHistogram 2.2.0 through 2.2.2 allows local users to exhaust JVM memory via a crafted direct buffer. AbstractHistogram.decodeFromCompressedByteBuffer reads lengthOfCompressedContents from the buffer and passes it directly to a byte-array allocation when the ByteBuffer is not array-backed, without checking the remaining data. Reachability requires a consuming application to pass attacker-influenced compressed histogram data in a direct buffer; the project closed the report as bogus, and the CVE record is disputed.
The record
- CVE
- CVE-2026-14683
- Published
- Jul 4, 2026
- Updated
- Jul 4, 2026
- Vendor
- HdrHistogram
- Product
- HdrHistogram
- Classifications
- CWE-789, CWE-400, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 4, 2026CVE publishedPublication date reported by the CVE source.
- Jul 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.2.0
- Affected versionversion=2.2.1
- Affected versionversion=2.2.2
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- DirectByteBuffer compressed-length OOM proof of conceptproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
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