diff --git a/muted-tests.yml b/muted-tests.yml
index 44a87a13241d0..b8d05b798d99e 100644
--- a/muted-tests.yml
+++ b/muted-tests.yml
@@ -524,3 +524,6 @@ tests:
 - class: org.elasticsearch.xpack.ml.packageloader.action.ModelLoaderUtilsTests
   method: testSplitIntoRanges
   issue: https://github.com/elastic/elasticsearch/issues/121799
+- class: org.elasticsearch.xpack.esql.heap_attack.HeapAttackIT
+  method: testLookupExplosionBigStringManyMatches
+  issue: https://github.com/elastic/elasticsearch/issues/121465