From bd9f32f7aed240f5c626d4b7b4f053b8f1d1a425 Mon Sep 17 00:00:00 2001
From: Devel <Denislav08@proton.me>
Date: Thu, 4 Jun 2026 18:03:36 +0300
Subject: [PATCH] numfmt: prevent panic if float precision specifier > 65535
 (#12600)

---
 src/uu/numfmt/src/format.rs  | 2 +-
 tests/by-util/test_numfmt.rs | 8 ++++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/uu/numfmt/src/format.rs b/src/uu/numfmt/src/format.rs
index 61c45b2fa..a6c88eb37 100644
--- a/src/uu/numfmt/src/format.rs
+++ b/src/uu/numfmt/src/format.rs
@@ -628,7 +628,7 @@ fn transform_to(
             "{:.precision$}",
             round_with_precision(i2, round_method, precision),
         )),
-        None if is_precision_specified => {
+        None if is_precision_specified && precision <= u16::MAX.into() => {
             let i2 = round_with_precision(i2, round_method, 0);
             localize(format!("{i2:.precision$}"))
         }
diff --git a/tests/by-util/test_numfmt.rs b/tests/by-util/test_numfmt.rs
index ba2560a82..7e6f940bc 100644
--- a/tests/by-util/test_numfmt.rs
+++ b/tests/by-util/test_numfmt.rs
@@ -1627,3 +1627,11 @@ fn test_multibyte_suffix_issue11937() {
         .succeeds()
         .stdout_is("   692.00€\n");
 }
+
+#[test]
+fn test_float_precision_greater_than_16bits() {
+    new_ucmd!()
+        .args(&["--to=iec", "--format=%.65536f", "1"])
+        .succeeds()
+        .stdout_is("1\n");
+}