Vulnerability in luben zstd-jni

[ Why it matters ]Priority signals

• Public proof-of-concept exploit exists (CISA SSVC)

[ Description ]Official description

zstd-jni versions before 1.5.7-14 fail to validate closed state in setDict, setLongMax, setLevel and setRefMultipleDDicts methods of stream classes. Attackers can call these methods on closed streams to write through freed native pointers, corrupting unrelated objects or crashing the JVM.

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ Advisories ]Government CERT advisories

• CERT-FR16 Oct 2026CERTFR-2026-AVI-1336

  Multiple vulnerabilities in IBM products Translated from French

  Multiple vulnerabilities have been discovered in IBM products. Some of them allow an attacker to cause remote arbitrary code execution, privilege escalation and remote denial of service.

  CVE-2026-14671CVE-2026-11548CVE-2022-22950+490 more CVEs
• BSI CERT-Bund6 Oct 2026WID-SEC-2026-3791

  IBM SPSS: Multiple vulnerabilities Translated from German

  Risk highCVE-2026-87795CVE-2026-87824CVE-2026-73334+7 more CVEs

[ References ]References

• github.com/luben/zstd-jni/security/advisories/GHSA-2jw3-mg7f-vw4qvendor-advisory
• github.com/luben/zstd-jni/commit/f38f9a1563113d96d0fc38baee543f7457dd8a8epatch
• github.com/luben/zstd-jni/commit/393d7311766abbc285b149302c0fe1f94b16d555patch
• github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/BaseZstdBu…technical-description
• github.com/luben/zstd-jni/blob/v1.5.7-13/src/main/java/com/github/luben/zstd/ZstdInputS…technical-description
• github.com/luben/zstd-jni/releases/tag/v1.5.7-14release-notes
• github.com/luben/zstd-jni/commit/0827ed02551bbd8d6f8e4bbff99d83bf50f91938technical-descriptionpatch
• github.com/luben/zstd-jniproduct
• www.vulncheck.com/advisories/zstd-jni-1.3.8-4-through-1.5.7-13-use-after-free-via-sette…third-party-advisory