diff --git a/muted-tests.yml b/muted-tests.yml
index f1d598e972395..c61e5e98518cf 100644
--- a/muted-tests.yml
+++ b/muted-tests.yml
@@ -394,6 +394,9 @@ tests:
   issue: https://github.com/elastic/elasticsearch/issues/121415
 - class: org.elasticsearch.datastreams.TSDBPassthroughIndexingIT
   issue: https://github.com/elastic/elasticsearch/issues/121464
+- class: org.elasticsearch.xpack.esql.heap_attack.HeapAttackIT
+  method: testLookupExplosionBigStringManyMatches
+  issue: https://github.com/elastic/elasticsearch/issues/121465
 
 # Examples:
 #