Heap-Based Buffer Overflow in Squirrel Library Affects Functionality of Squirrel
CVE-2026-2661

4.8MEDIUM

Key Information:

Vendor

Squirrel

Status
Squirrel
Vendor
CVE Published:
18 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2661?

A security flaw has been identified in the Squirrel library, specifically affecting versions up to 3.2. The vulnerability resides in the SQObjectPtr::operator function within squirrel/sqobject.h, leading to a heap-based buffer overflow. This flaw requires local access to exploit and poses significant security risks, as an exploit has already been made publicly available. Despite early notification by the project, there has been no response or patch issued to address this issue, which raises concerns for users relying on Squirrel for their applications.

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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-2026-2661 - Proof of Concept

References

https://vuldb.com/?id.346459
vdb-entrytechnical-description
https://vuldb.com/?ctiid.346459
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https://vuldb.com/?submit.753165
third-party-advisory

CVSS V4

Score:
4.8
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
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

Oneafter (VulDB User)
JSON
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