CVE-2026-9541: Squirrel Cnut File sqobject.cpp ReadObject heap-based overflow

Severity: medium (CVSS 5.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-05-26 · updated 2026-07-23
Weakness: CWE-119

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.

Affected products

Squirrel: through 3.2

References

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://vuldb.com/vuln/365602
https://vuldb.com/vuln/365602/cti
https://github.com/albertodemichelis/squirrel/issues/327

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