From 295c7363608a7bace97fdd9b39722859a2723e5d Mon Sep 17 00:00:00 2001
From: Maksym Veremchuk <elysium31@gmail.com>
Date: Wed, 11 Feb 2026 21:01:46 +0200
Subject: [PATCH] Fix InvalidBuffedError on incomplete recv data (#4740)

Co-authored-by: Maksym Veremchuk <jack.j2m@proton.me>
---
 telethon/network/connection/tcpfull.py | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/telethon/network/connection/tcpfull.py b/telethon/network/connection/tcpfull.py
index 50c5c915..33039549 100644
--- a/telethon/network/connection/tcpfull.py
+++ b/telethon/network/connection/tcpfull.py
@@ -1,3 +1,4 @@
+import asyncio
 import struct
 from zlib import crc32
 
@@ -22,7 +23,10 @@ class FullPacketCodec(PacketCodec):
         return data + crc
 
     async def read_packet(self, reader):
-        packet_len_seq = await reader.readexactly(8)  # 4 and 4
+        try:
+            packet_len_seq = await reader.readexactly(8)  # 4 and 4
+        except asyncio.IncompleteReadError as exc:
+            return exc.partial
         packet_len, seq = struct.unpack('<ii', packet_len_seq)
         if packet_len < 0 and seq < 0:
             # It has been observed that the length and seq can be -429,