CVE-2026-9541

Description

A security flaw has been discovered in Squirrel up to 3.2. Impacted is the function ReadObject of the file squirrel/sqobject.cpp of the component Cnut File Handler. Performing a manipulation results in heap-based buffer overflow. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet.

CVSS v3.1 Score

5.3

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

EPSS — Exploit Prediction

0.0001

Probability of exploitation

0.02%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-119 Buffer Overflow

CWE-122 CWE-122

Affected Products

Vendor	Product	Versions
squirrel-lang	squirrel	< 3.2

References

Advisories & Patches

https://github.com/albertodemichelis/squirrel/issues/327 https://github.com/albertodemichelis/squirrel/issues/327

Exploits

https://github.com/albertodemichelis/squirrel/issues/327 https://github.com/biniamf/pocs/tree/main/squirrel-sqobject-readobject-neg-len-oob https://vuldb.com/submit/814826 https://github.com/albertodemichelis/squirrel/issues/327

Other References

https://vuldb.com/vuln/365602 https://vuldb.com/vuln/365602/cti

Frequently Asked Questions

What is CVE-2026-9541? +

A security flaw has been discovered in Squirrel up to 3.2. Impacted is the function ReadObject of the file squirrel/sqobject.cpp of the component Cnut File Handler. Performing a manipulation results in heap-based buffer overflow. The attack is only possible with local access. The exploit has been released to the public and may be used for attacks. The project was informed of the problem early through an issue report but has not responded yet. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-9541? +

CVE-2026-9541 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0001, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-9541? +

CVE-2026-9541 affects products from squirrel-lang, specifically: squirrel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-9541? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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