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python-3.12
to version 3.12.8-r1 or higher.
Note: Versions mentioned in the description apply only to the upstream python-3.12
package and not the python-3.12
package as distributed by Chainguard
.
See How to fix?
for Chainguard
relevant fixed versions and status.
Starting in Python 3.12.0, the asyncio._SelectorSocketTransport.writelines() method would not "pause" writing and signal to the Protocol to drain the buffer to the wire once the write buffer reached the "high-water mark". Because of this, Protocols would not periodically drain the write buffer potentially leading to memory exhaustion.
This vulnerability likely impacts a small number of users, you must be using Python 3.12.0 or later, on macOS or Linux, using the asyncio module with protocols, and using .writelines() method which had new zero-copy-on-write behavior in Python 3.12.0 and later. If not all of these factors are true then your usage of Python is unaffected.