diff --git a/lib/matplotlib/axes/_axes.py b/lib/matplotlib/axes/_axes.py
index 74243b71a152..ecb0e611af89 100644
--- a/lib/matplotlib/axes/_axes.py
+++ b/lib/matplotlib/axes/_axes.py
@@ -4999,6 +4999,10 @@ def reduce_C_function(C: array) -> float
ty = np.log10(ty)
if extent is not None:
xmin, xmax, ymin, ymax = extent
+ if xmin > xmax:
+ raise ValueError("In extent, xmax must be greater than xmin")
+ if ymin > ymax:
+ raise ValueError("In extent, ymax must be greater than ymin")
else:
xmin, xmax = (tx.min(), tx.max()) if len(x) else (0, 1)
ymin, ymax = (ty.min(), ty.max()) if len(y) else (0, 1)
diff --git a/lib/matplotlib/tests/test_axes.py b/lib/matplotlib/tests/test_axes.py
index d8d7cb0144f1..e3379b7ed78f 100644
--- a/lib/matplotlib/tests/test_axes.py
+++ b/lib/matplotlib/tests/test_axes.py
@@ -962,6 +962,18 @@ def test_hexbin_extent():
ax.hexbin("x", "y", extent=[.1, .3, .6, .7], data=data)
+def test_hexbin_bad_extents():
+ fig, ax = plt.subplots()
+ data = (np.arange(20) / 20).reshape((2, 10))
+ x, y = data
+
+ with pytest.raises(ValueError, match="In extent, xmax must be greater than xmin"):
+ ax.hexbin(x, y, extent=(1, 0, 0, 1))
+
+ with pytest.raises(ValueError, match="In extent, ymax must be greater than ymin"):
+ ax.hexbin(x, y, extent=(0, 1, 1, 0))
+
+
@image_comparison(['hexbin_empty.png'], remove_text=True)
def test_hexbin_empty():
# From #3886: creating hexbin from empty dataset raises ValueError
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