CVE-2017-6949: Call-Cc Chicken

High severity, CVSS 8.1. EPSS: 1.5% chance of exploitation in the next 30 days.

An issue was discovered in CHICKEN Scheme through 4.12.0. When using a nonstandard CHICKEN-specific extension to allocate an SRFI-4 vector in unmanaged memory, the vector size would be used in unsanitised form as an argument to malloc(). With an unexpected size, the impact may have been a segfault or buffer overflow.

Affected products

• Call-Cc Chicken: version 4.12.0 only

Published 2017-03-16. Last modified 2026-06-17.