CVE-2026-2661: Squirrel sqobject.h operator heap-based overflow

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2026-02-18 · updated 2026-06-17
Weakness: CWE-119

Description

A security flaw has been discovered in Squirrel up to 3.2. This affects the function SQObjectPtr::operator in the library squirrel/sqobject.h. The manipulation results in heap-based buffer overflow. The attack needs to be approached locally. 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/310
https://github.com/oneafter/0122/blob/main/i310/repro
https://vuldb.com/?ctiid.346459
https://vuldb.com/?id.346459
https://vuldb.com/?submit.753165

Get alerted when CVE-2026-2661 or the next vulnerability affects your stack