diff --git a/sebrief/pipeline.py b/sebrief/pipeline.py
index 80f0285..f88da92 100644
--- a/sebrief/pipeline.py
+++ b/sebrief/pipeline.py
@@ -86,6 +86,11 @@ def build_payload(week: str, settings: Settings, store: Store) -> WeekPayload:
         run_safely("store", lambda: store.upsert_papers(papers), None, gaps)
     pending = run_safely("store", lambda: store.pending_papers(week), [], gaps)
 
+    # 과거 주를 소급 생성할 때, 그 주가 끝난 뒤 발행됐지만 아직 다이제스트에 안 실린 논문이
+    # 과거 주차로 끌려 들어가(그리고 digest_week가 찍혀 다음 월요일 다이제스트에서 사라지는) 것을
+    # 막는다. 정규 주간 실행은 수집 창이 week_end에서 끝나 아무것도 걸러지지 않는다.
+    pending = [p for p in pending if p.published_date is None or p.published_date <= week_end]
+
     if len(pending) > settings.max_papers:
         # The cap only ever drops papers that have not been published yet. Papers already stamped
         # with THIS week (--force re-run) must stay: dropping one would erase it from the published
diff --git a/tests/test_pipeline.py b/tests/test_pipeline.py
index 15f08cd..c1aa4f1 100644
--- a/tests/test_pipeline.py
+++ b/tests/test_pipeline.py
@@ -84,6 +84,18 @@ def test_build_payload_invalid_feed_spec_is_a_gap(env):
     assert any("invalid feed spec" in g for g in payload.data_gaps)
 
 
+def test_backfill_excludes_papers_published_after_the_week(env):
+    # 과거 주 소급 생성: 그 주 이후에 발행된 미소화 논문은 과거 다이제스트로 끌려가면 안 된다
+    from datetime import date
+
+    in_week = make_paper("10.1/inweek", published_date=date(2026, 9, 2))
+    later = make_paper("10.1/later", published_date=date(2026, 9, 20))  # W36 이후 발행
+    undated = make_paper("10.1/undated", published_date=None)
+    env["store"].pending = [in_week, later, undated]
+    payload = build_payload(WEEK, env["settings"], env["store"])  # WEEK = 2026-W35 (…~09-06)
+    assert [p.doi for p in payload.papers] == ["10.1/inweek", "10.1/undated"]
+
+
 def test_build_payload_caps_papers_and_notes_rollover(env):
     env["store"].pending = [make_paper(f"10.1/p{i}") for i in range(5)]
     env["settings"] = env["settings"].model_copy(update={"max_papers": 3})