CVE-2026-8261
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA vulnerability was determined in Squirrel up to 3.2. This affects the function SQFunctionProto::Load of the file squirrel/sqobject.cpp. This manipulation causes heap-based buffer overflow. The attack is restricted to local execution. The exploit has been publicly disclosed and may be utilized. The project was informed of the problem early through an issue report but has not responded yet.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceHeap-based buffer overflow in Squirrel scripting language's SQFunctionProto::Load function in squirrel/sqobject.cpp, affecting versions up to 3.2. The vulnerability occurs during deserialization/loading of function prototypes, where insufficient bounds checking allows writing beyond allocated heap buffers.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- Low
- Integrity
- Low
- Availability
- Low
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify Squirrel installationSearch for squirrel executables (sqplus, sqvm, squirrel) or libraries (libsquirrel.so, squirrel.lib) in common locations such as /usr/bin, /usr/local/bin, /opt, or C:\Program Files. Also check if application bundles include Squirrel as an embedded scripting engine.Affected if Squirrel binaries or libraries are found on the system
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Determine installed Squirrel versionRun 'squirrel --version' or check the library version string (e.g., 'strings libsquirrel.so | grep -i version'). For applications using Squirrel, check the application's documentation or binary metadata for the bundled Squirrel version.Affected if The discovered version is 3.2 or any version lower than 3.2
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Verify script loading capabilityCheck if the Squirrel interpreter or any application using Squirrel can load external .nut script files. Look for script loading functions in code, configuration files, or user-accessible features that parse Squirrel bytecode or source.Affected if The system allows loading of untrusted .nut files or Squirrel bytecode (function prototypes)
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Assess local access exposureDetermine whether untrusted users have shell access, file upload capability, or can place malicious .nut files in locations where Squirrel will load them. Check file permissions on script directories and Squirrel binary locations.Affected if Untrusted local users can execute Squirrel or supply scripts to a Squirrel-based application
You are affected if Squirrel version 3.2 or below is installed and untrusted users can load malicious .nut script files or function prototypes into the Squirrel runtime.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataUntil an official patch is released, restrict local access to untrusted squirrel scripts and consider input validation on any script files before loading. Monitor vendor channels for updates.
- Consultation2.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $5,248.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2026-8261 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2026-8261 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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