JVM crash via overflowing native bounds checks
Published Sep 9, 2026 · Updated Sep 9, 2026
Out-of-bounds reads in Luben zstd-jni 1.1.1 through 1.5.7-13 allow attackers to crash a JVM through crafted buffer offsets. Three direct-ByteBuffer frame-size native methods add or subtract signed 32-bit offsets and sizes without first rejecting negative values, allowing checks to wrap or pass before pointer arithmetic. Reachability requires a consuming application to pass attacker-influenced values to these public native methods; only JVM termination was demonstrated.
Summary
What happened
Out-of-bounds reads in Luben zstd-jni 1.1.1 through 1.5.7-13 allow attackers to crash a JVM through crafted buffer offsets. Three direct-ByteBuffer frame-size native methods add or subtract signed 32-bit offsets and sizes without first rejecting negative values, allowing checks to wrap or pass before pointer arithmetic. Reachability requires a consuming application to pass attacker-influenced values to these public native methods; only JVM termination was demonstrated.
The record
- CVE
- CVE-2026-87823
- Published
- Sep 9, 2026
- Updated
- Sep 9, 2026
- Vendor
- Luben
- Product
- zstd-jni
- Classifications
- CWE-125, CWE-190
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 9, 2026CVE publishedPublication date reported by the CVE source.
- Sep 9, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=1.1.1 <1.5.7-14
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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.
Public exploit references
- GHSA direct-ByteBuffer crash reproductionproof of concept · demonstrated
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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