CVE-2026-8258
Squirrel sqstdstring.cpp validate_format stack-based overflow
Vexday Risk Score
33Attention
SSVC decision (CISA)
Attend
PoC available → attend closely
Exploit maturity
Proof of concept
Public proof of concept exists, but not yet automated.
CVSS 4.8EPSS 0.1%KEV nãoPoC públicaNuclei —Metasploit —Patch —
Lifecycle
11 May 2026Published on NVD
Recommendation: Plan a near-term fix — a public PoC already exists.
A flaw has been found in Squirrel up to 3.2. Impacted is the function validate_format in the library sqstdlib/sqstdstring.cpp. Executing a manipulation can lead to stack-based buffer overflow. The attack can only be executed locally. The exploit has been published and may be used. The project was informed of the problem early through an issue report but has not responded yet.
CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:P
Affected products
n/a · Squirrelpublic PoCs found — 1
cve_referencegithub.com/biniamf/pocs/tree/main/squirrel-validate_format-memcpy-oobunverified⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.