Memory Corruption Vulnerability in 101arrowz fflate Affects Functionality
CVE-2026-122146

6.9MEDIUM

Key Information:

Vendor

101arrowz

Status
Fflate
Vendor
CVE Published:
5 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-122146?

A vulnerability has been identified in the 101arrowz fflate library, specifically in the unzipSync function found in esm/index.mjs. This weakness can lead to memory corruption, which disrupts normal functionality and may be exploited remotely. Publicly available exploit techniques raise concerns about potential attacks targeting systems that utilize this library. Despite being informed about the vulnerability, the vendor has yet to respond, leaving users at risk.

Affected Version(s)

fflate 0.8.0

fflate 0.8.1

fflate 0.8.2

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-2026-122146 - Proof of Concept

References

https://vuldb.com/vuln/431150
vdb-entrytechnical-description
https://vuldb.com/vuln/431150/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-122146
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

ictrun (VulDB User)
VulDB CNA Team
.