You are right, I just checked and there is indeed a memory leak in the GBT code. I'll push a quick fix to GitHub shortly. Hopefully I'll also be able to publish new binaries soon.
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./minerd -a sha256d -o http://127.0.0.1:8228 -t 1 -u rpcuser -p rpcpassword -D -P
[2016-02-05 12:33:00] 1 miner threads started, using 'sha256d' algorithm.
[2016-02-05 12:33:00] ...retry after 10 seconds
[2016-02-05 12:33:10] ...retry after 10 seconds
[2016-02-05 12:33:20] ...retry after 10 seconds
./minerd -a sha256d -o http://localhost:8288 -t 1 -u rpcuser -p rpcpassword -D -P
[2016-02-05 15:27:18] 1 miner threads started, using 'sha256d' algorithm.
[2016-02-05 15:27:18] JSON protocol request:
{"method": "getblocktemplate", "params": [{"capabilities": ["coinbasetxn", "coinbasevalue", "longpoll", "workid"]}], "id":0}
* Rebuilt URL to: http://localhost:8228/
* Hostname was NOT found in DNS cache
* Trying 127.0.0.1...
* TCP_NODELAY set
* Adding handle: conn: 0x7f0e10012b10
* Adding handle: send: 0
* Adding handle: recv: 0
* Curl_addHandleToPipeline: length: 1
* - Conn 0 (0x7f0e10012b10) send_pipe: 1, recv_pipe: 0
* Connected to localhost (127.0.0.1) port 8228 (#0)
* Server auth using Basic with user 'rpcuser'
> POST / HTTP/1.1
Authorization: Basic cnBjdXNlcjpycGNwYXNzd29yZA==
Host: localhost:8228
Accept-Encoding: deflate, gzip
Content-Type: application/json
Content-Length: 126
User-Agent: cpuminer/2.4.3
X-Mining-Extensions: midstate
* The requested URL returned error: 500 Internal Server Error
* Closing connection 0
[2016-02-05 15:27:18] HTTP request failed: The requested URL returned error: 500 Internal Server Error
[2016-02-05 15:27:18] json_rpc_call failed, retry after 30 seconds