Use After Free Vulnerability in Luben Zstd-jni Product
CVE-2026-90852

6.9MEDIUM

Key Information:

Vendor

Luben

Status
Zstd-jni
Vendor
CVE Published:
15 September 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-90852?

A vulnerability in Luben zstd-jni affects the ZstdCompressCtx.loadDict function within the Dictionary Sharing component, leading to potential use after free scenarios. The vulnerability can be exploited by an attacker remotely, allowing them to manipulate memory usage adversely. Immediate upgrade to version 1.5.7-14 is recommended to resolve this issue, following the public disclosure of the exploit. The vendor has acknowledged the concern and rapidly issued a fix, demonstrating proactive security measures. Users are advised to update to safeguard their systems.

Affected Version(s)

zstd-jni 1.5.7-13

zstd-jni 1.5.7-14

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-90852 - Proof of Concept

References

https://vuldb.com/vuln/403407
vdb-entrytechnical-description
https://vuldb.com/vuln/403407/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-90852
third-party-advisory

CVSS V4

Score:
6.9
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

Yu Bao from PayPal Cyber Security Team (VulDB User)
VulDB CNA Team
.