Propulsion assembly for an aircraft, said propulsion assembly having: - a jet engine having a central casing around a longitudinal axis and having a vertical median plane passing through the longitudinal axis, - an attachment pylon having a rigid structure that takes the form of a box that has a lower wall, an upper wall, two lateral walls and a frontal wall, - a front engine attachment, - a rear engine attachment interposed between a median zone of the rigid structure and a rear upper part of the central casing, and - a device for reacting the thrust forces generated by the jet engine, wherein the front engine attachment has, on either side of the median plane, a front rod (152a-b) and each front rod (152a-b) is fastened in an articulated manner via a connection point to a front end of the rigid structure and via a connection point to a front fitting as one with an upper part of the central casing, and wherein the device for reacting the thrust forces of the jet engine has two central rods disposed on either side of the median plane, for each central rod, a first fitting as one with the rigid structure and a second fitting as one with a front part of the central casing, wherein the two first fittings are independent of one another, wherein each central rod is fastened in an articulated manner via one of its ends to the first fitting and via the other of its ends to the second fitting and wherein the rear engine attachment has a rear rod fastened in an articulated manner via two connection points to a rear fitting as one with the central casing and via one connection point to an upper fitting as one with the rigid structure, the propulsion assembly being characterized in that each first fitting is fastened to one of the lateral walls of the rigid structure. - a jet engine having a central casing around a longitudinal axis and having a vertical median plane passing through the longitudinal axis, - an attachment pylon having a rigid structure that takes the form of a box that has a lower wall, an upper wall, two lateral walls and a frontal wall, - a front engine attachment, - a rear engine attachment interposed between a median zone of the rigid structure and a rear upper part of the central casing, and - a device for reacting the thrust forces generated by the jet engine, wherein the front engine attachment has, on either side of the median plane, a front rod (152a-b) and each front rod (152a-b) is fastened in an articulated manner via a connection point to a front end of the rigid structure and via a connection point to a front fitting as one with an upper part of the central casing, and wherein the device for reacting the thrust forces of the jet engine has two central rods disposed on either side of the median plane, for each central rod, a first fitting as one with the rigid structure and a second fitting as one with a front part of the central casing, wherein the two first fittings are independent of one another, wherein each central rod is fastened in an articulated manner via one of its ends to the first fitting and via the other of its ends to the second fitting and wherein the rear engine attachment has a rear rod fastened in an articulated manner via two connection points to a rear fitting as one with the central casing and via one connection point to an upper fitting as one with the rigid structure, the propulsion assembly being characterized in that each first fitting is fastened to one of the lateral walls of the rigid structure. wherein the front engine attachment has, on either side of the median plane, a front rod (152a-b) and each front rod (152a-b) is fastened in an articulated manner via a connection point to a front end of the rigid structure and via a connection point to a front fitting as one with an upper part of the central casing, and wherein the device for reacting the thrust forces of the jet engine has two central rods disposed on either side of the median plane, for each central rod, a first fitting as one with the rigid structure and a second fitting as one with a front part of the central casing, wherein the two first fittings are independent of one another, wherein each central rod is fastened in an articulated manner via one of its ends to the first fitting and via the other of its ends to the second fitting and wherein the rear engine attachment has a rear rod fastened in an articulated manner via two connection points to a rear fitting as one with the central casing and via one connection point to an upper fitting as one with the rigid structure, the propulsion assembly being characterized in that each first fitting is fastened to one of the lateral walls of the rigid structure.