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An incorrect "pair?" check in the Scheme "length" procedure results in an unsafe pointer dereference in all CHICKEN Scheme versions prior to 4.13, which allows an attacker to cause a denial of service by passing an improper list to an application that calls "length" on it.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade chicken | Aug 30, 2017 | Jun 1, 2017 |
| Debian | — | Upgrade chicken | Jul 30, 2024 | Jun 1, 2017 |
| Freebsd | — | Upgrade chicken | Aug 14, 2018 | Aug 12, 2018 |
| Ubuntu | — | No solution exists | Jun 26, 2025 | Jun 1, 2017 |
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