In this context, the probable senses ‘to stink, produce a foul smell’ or ‘to become putrid, gangrenous and foul-smelling’ (cf. the adjective pulent) do not seem relevant. Some influence from the verb putrescere (DMLBS 2589c) may be possible.
v.n.
1to rot, decay:
(
c.1200; MS: c.1220-40
)
El desert vos cors pudlentirunt (var. (B: s.xiii3/4) pullentirunt), E vos espies murrunt de male mort
(E) 2625