AZL-85922

Text::CSV_XS versions before 1.62 for Perl have a use-after-free when registered callbacks extend the Perl argument stack, which may enable type confusion or memory corruption.

The Parse, print, getline, and getlineall methods invoke registered callbacks (for example afterparse, beforeprint, or onerror) and cache the Perl argument stack pointer across the call. If a callback extends the argument stack enough to trigger a reallocation, the return value is written through the stale pointer into the freed buffer, and the caller reads the original $self argument as the return value instead.

Calling code that expects parsed data from getlineall receives the Text::CSVXS object in its place, leading to logic errors or crashes. Text::CSV_XS objects used without any registered callbacks are not affected.