High severity · published Sep 9, 2026
CVE-2026-87823
zstd-jni 1.1.1 through 1.5.7-13 Out-of-Bounds Read via Direct ByteBuffer Frame-Size Methods
8.2
CVSS
0.4%
EPSS
No
On KEV
Description
zstd-jni before 1.5.7-14 performs 32-bit signed bounds checks on three direct-ByteBuffer frame-size native methods, allowing out-of-bounds memory reads via negative or overflowing offsets. Attackers can supply negative offset values near Integer.MIN_VALUE to read unmapped memory, causing JVM termination or extracting arbitrary frame size data from unintended memory locations.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
Low
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
ZS
zstd-jni · luben
1.1.1 before 1.5.7-14 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-87823
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-87823
github.com
https://github.com/luben/zstd-jni
github.com
https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/Zstd.java
github.com
https://github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/native/jni_zstd.c
github.com
https://github.com/luben/zstd-jni/commit/46dcb2a54c8b8f2ce2cad7187a7513f509c533ac
github.com
https://github.com/luben/zstd-jni/commit/d7a1c99322d5e1fc71932e722c0b5bb2fc525d3f
github.com
https://github.com/luben/zstd-jni/releases/tag/v1.5.7-14
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