Vulnerability · Published May 11, 2026 · Assigned by VulDB

CVE-2026-8261Squirrel sqobject.cpp Load heap-based overflow

Medium 5.9

In plain English

A medium-severity heap buffer overflow in Squirrel. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).

Severity (CVSS 3.1)5.9Medium

Exploit odds (30 days)0.2%top 95.5% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

A 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.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Debian:13	squirrel3	no fix listed	DEBIAN-CVE-2026-8261
Ubuntu:22.04:LTS	squirrel3	no fix listed	UBUNTU-CVE-2026-8261
Ubuntu:25.10	squirrel3	no fix listed	UBUNTU-CVE-2026-8261
Ubuntu:26.04:LTS	squirrel3	no fix listed	UBUNTU-CVE-2026-8261
Ubuntu:26.10	squirrel3	no fix listed	UBUNTU-CVE-2026-8261

Affected products (as reported)

Vendor	Product	Versions
n/a	Squirrel	3.03.13.2

Weakness: CWE-122, CWE-119 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L/E:P/RL:X/RC:R

References

VDB-362558 | Squirrel sqobject.cpp Load heap-based overflow vdb-entry, technical-description
VDB-362558 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #809904 | albertodemichelis squirrel 3.2 Heap-based Buffer Overflow third-party-advisory
https://github.com/albertodemichelis/squirrel/issues/326 issue-tracking
https://github.com/biniamf/pocs/tree/main/squirrel-sqobject-functionproto-load-intovf-lineinfos exploit