[3.13] gh-143309: fix UAF in os.execve when the environment is concurrently mutated (GH-143314)
#143431
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…s concurrently mutated (python#143314) (python#143415) (cherry picked from commit 9609574) (cherry picked from commit c99f766)
This was referenced Jan 5, 2026
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(cherry picked from commit 9609574)
(cherry picked from commit c99f766)
parse_envlistvia re-entrantenv.keys()orenv.values()#143309