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Fencer Intel
high 8.2

CVE-2026-87823 json

zstd-jni 1.1.1 through 1.5.7-13 Out-of-Bounds Read via Direct ByteBuffer Frame-Size Methods

published 2mo ago modified last mo. also EUVD-2026-75021 , GHSA-jfr6-9xqw-2g2q

Unreviewed: the maintainers' own advisory

Published by the maintainers on their GitHub repository luben/zstd-jni. GitHub has not reviewed it into the GitHub Advisory Database, so the affected packages and versions are the maintainers' word. Read the full advisory on GitHub.

cvss
8.2
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 37%
public exploits
0
none known

Summary

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.

Patch / fix

  • luben zstd-jni 1.5.7-14
  • zstd-jni-java Debian 14 1.5.7-23+ds-1

debian advisories DEBIAN-CVE-2026-87823

  • zstd-jni SLES 16.0, SLES for SAP applications 16.0 1.5.7.16-160000.1.1

suse advisories SUSE-SU-2026:23858-1SUSE-SU-2026:23868-1

  • zstd-jni openSUSE Leap 16.0 1.5.7.16-160000.1.1
  • zstd-jni openSUSE Tumbleweed 1.5.7.16-1.1

opensuse advisories openSUSE-SU-2026:21902-1openSUSE-SU-2026:11769-1

Is CVE-2026-87823 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-87823 updated cvss 8.2

com.github.luben/zstd-jni: zstd-jni: Denial of Service or Information Disclosure via out-of-bounds read

  • Red Hat Ceph Storage 9 libarrow, parquet-libs
    affected: workaround, no fix available “Fix deferred”
  • Red Hat build of Quarkus 3.27.5.SP2
    fixed: vendor fix RHSA-2026:69470
  • Red Hat build of Quarkus 3.33.3.SP2
    fixed: vendor fix RHSA-2026:69440
  • Red Hat Exploit Intelligence exploit-intelligence/agent-client-rhel9 Red Hat OpenShift Developer Tools and Services ocp-tools-4/jenkins-rhel8, ocp-tools-4/jenkins-rhel9, jenkins-2-plugins 4.19.1758207171-1.el9 Red Hat build of Apache Camel 4 for Quarkus 3 zstd-jni 1.5.7-7 Red Hat build of Apache Camel for Spring Boot 4 zstd-jni 1.5.7-7 Red Hat build of Apicurio Registry 3 zstd-jni 1.5.7-7 Red Hat build of Debezium 3 zstd-jni 1.5.7-7
    +3 more products
    Red Hat Enterprise Linux 8 apache-commons-compress, apache-commons-compress-javadoc Red Hat Enterprise Linux 9 jmc Red Hat Fuse 7 zstd-jni 1.5.7-7
    not affected: vulnerable code not present
  • Red Hat Hardened Images maven3.9 3.9.16-0.2.hum1
    not affected: component not present
  • Red Hat JBoss Enterprise Application Platform 8 zstd-jni 1.5.7-7 Red Hat JBoss Enterprise Application Platform Expansion Pack zstd-jni 1.5.7-7 Red Hat OpenShift AI (RHOAI) rhoai/odh-spark-operator-rhel9, rhoai/odh-th-torch-cpu-py312-rhel9, rhoai/odh-th-torch-cuda-py312-rhel9, rhoai/odh-th06-cpu-torch210-py312-rhel9, rhoai/odh-th06-cpu-torch291-py312-rhel9, rhoai/odh-th06-rocm64-torch291-py312-rhel9, +2 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
2mo ago

Exploit prediction

0.43% chance of exploitation in the next 30 days, higher than 37% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/luben/zstd-jni/security/advisories/GHSA-jfr6-9xqw-2g2q referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 8.8 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N
CNA 3.1 8.2 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
CNA 4.0 8.8 CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected products

  • luben zstd-jni

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

The maintainers of luben/zstd-jni published their own advisory on GitHub. Reviewed sources take precedence over it.