Heap-based Buffer Overflow in Squirrel Cnut File Handler
CVE-2026-9541

4.8MEDIUM

Key Information:

Vendor

Squirrel

Status
Squirrel
Vendor
CVE Published:
26 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-9541?

A vulnerability has been identified in the Squirrel application up to version 3.2, specifically within the ReadObject function located in squirrel/sqobject.cpp of the Cnut File Handler. This flaw permits a local attacker to exploit a heap-based buffer overflow through manipulated input, leading to potential unauthorized access and control over system resources. An exploit demonstrating this vulnerability has already been made public. Despite early notification to the Squirrel project about this issue, there has been no official response or patch to mitigate the risks associated with this security concern.

Affected Version(s)

Squirrel 3.0

Squirrel 3.1

Squirrel 3.2

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-2026-9541 - Proof of Concept

References

https://vuldb.com/vuln/365602
vdb-entrytechnical-description
https://vuldb.com/vuln/365602/cti
signaturepermissions-required
https://vuldb.com/submit/814826
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
Attack Vector:
Local
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

biniam (VulDB User)
VulDB CNA Team
.