skeleton.c in yacc does not properly handle reduction of a rule with an empty right hand side, which allows context-dependent attackers to cause an out-of-bounds stack access when the yacc stack pointer points to the end of the stack.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Yacc | Yacc | * | * |
| Byacc | Ubuntu | dapper | * |
| Byacc | Ubuntu | feisty | * |
| Byacc | Ubuntu | gutsy | * |
| Byacc | Ubuntu | hardy | * |
| Byacc | Ubuntu | upstream | * |