diff --git a/docs/changelog.rst b/docs/changelog.rst
index af756f37..6d35b7b2 100644
--- a/docs/changelog.rst
+++ b/docs/changelog.rst
@@ -27,6 +27,7 @@ In progress (unreleased)
 * :gh:issue:`1354` docs: Document Ansible 13 (ansible-core 2.20) support
 * :gh:issue:`1354` :mod:`mitogen`: Clarify error message when a module
   request would be refused by allow or deny listing
+* :gh:issue:`1348` :mod:`mitogen`: Fix hanging process with 100% CPU usage
 
 
 v0.3.35 (2025-12-01)
diff --git a/mitogen/parent.py b/mitogen/parent.py
index 9da5d58a..97681653 100644
--- a/mitogen/parent.py
+++ b/mitogen/parent.py
@@ -1436,11 +1436,16 @@ class Connection(object):
             os.environ['ARGV0']=sys.executable
             os.execl(sys.executable,sys.executable+'(mitogen:%s)'%sys.argv[2])
         os.write(1,'MITO000\n'.encode())
+        # Size of the compressed core source to be read
+        n=int(sys.argv[3])
         # Read `len(compressed preamble)` bytes sent by our Mitogen parent.
         # `select()` handles non-blocking stdin (e.g. sudo + log_output).
         # `C` accumulates compressed bytes.
         C=''.encode()
-        while int(sys.argv[3])-len(C)and select.select([0],[],[]):C+=os.read(0,int(sys.argv[3])-len(C))
+        # data chunk
+        V='V'
+        # Stop looping if no more data is needed or EOF is detected (empty bytes).
+        while n-len(C) and V:select.select([0],[],[]);V=os.read(0,n-len(C));C+=V
         # Raises `zlib.error` if compressed preamble is truncated or invalid
         C=zlib.decompress(C)
         f=os.fdopen(W,'wb',0)