CVE-2026-2661Public exploit

Interpreter crash via recursive metamethod stack corruption

Published Feb 18, 2026 · Updated Feb 18, 2026

Heap-based buffer overflow in Squirrel 3.0 through 3.2 allows local users to crash the interpreter by running a crafted script. Repeated _set and _get metamethod callbacks recurse through FallBackSet and Execute until SQObjectPtr::operator= reads beyond the VM stack's heap allocation. Local execution of attacker-controlled Squirrel code is required; the demonstrated consequence is a process crash, not confirmed code execution.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in Squirrel 3.0 through 3.2 allows local users to crash the interpreter by running a crafted script. Repeated _set and _get metamethod callbacks recurse through FallBackSet and Execute until SQObjectPtr::operator= reads beyond the VM stack's heap allocation. Local execution of attacker-controlled Squirrel code is required; the demonstrated consequence is a process crash, not confirmed code execution.

The record

CVE
CVE-2026-2661
Published
Feb 18, 2026
Updated
Feb 18, 2026
Vendor
Squirrel
Product
Squirrel
Classifications
CWE-122, CWE-119, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0
  2. Affected versionversion=3.1
  3. Affected versionversion=3.2

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Squirrel · Squirrelversion=3.0; version=3.1; version=3.2

Published CVSS scores

3.3VulDBCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1.9VulDBCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P
1.7VulDBAV:L/AC:L/Au:S/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow
CWE-119Improper Restriction of Operations within the Bounds of a Memory Buffer
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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