diff --git a/lib/checkuninitvar.cpp b/lib/checkuninitvar.cpp
index 2c1476c1836..e5f109d5cd1 100644
--- a/lib/checkuninitvar.cpp
+++ b/lib/checkuninitvar.cpp
@@ -1671,6 +1671,8 @@ void CheckUninitVar::valueFlowUninit()
                     const bool isleaf = isLeafDot(tok) || uninitderef;
                     if (!isleaf && Token::Match(tok->astParent(), ". %name%") && (tok->astParent()->next()->varId() || tok->astParent()->next()->isEnumerator()))
                         continue;
+                    if (isWithinScope(tok, tok->variable(), Scope::ScopeType::eLambda))
+                        continue;
                 }
                 const ExprUsage usage = getExprUsage(tok, v->indirect, *mSettings);
                 if (usage == ExprUsage::NotUsed || usage == ExprUsage::Inconclusive)
diff --git a/test/testuninitvar.cpp b/test/testuninitvar.cpp
index e19ea083fbc..6f66cd7c52a 100644
--- a/test/testuninitvar.cpp
+++ b/test/testuninitvar.cpp
@@ -63,6 +63,7 @@ class TestUninitVar : public TestFixture {
         TEST_CASE(valueFlowUninit2_value);
         TEST_CASE(valueFlowUninit_uninitvar2);
         TEST_CASE(valueFlowUninit_functioncall);
+        TEST_CASE(valueFlowUninit_lambda); // #12944
         TEST_CASE(uninitStructMember);  // struct members
         TEST_CASE(uninitvar2_while);
         TEST_CASE(uninitvar2_4494);      // #4494
@@ -4389,6 +4390,17 @@ class TestUninitVar : public TestFixture {
         ASSERT_EQUALS("[test.cpp:8] -> [test.cpp:4]: (warning) Uninitialized variable: i\n", errout_str());
     }
 
+    void valueFlowUninit_lambda() {  // #12944
+        valueFlowUninit( "void Fun()\n"
+                         "{\n"
+                         "    int var;\n"
+                         "    auto lam = [&]() { int x = var; };\n"
+                         "    var = 5;\n"
+                         "    lam();\n"
+                         "}\n");
+        ASSERT_EQUALS("", errout_str());
+    }
+
     void uninitStructMember() { // struct members
         checkUninitVar("struct AB { int a; int b; };\n"
                        "void f(void) {\n"