diff --git a/media/libwebp/moz.yaml b/media/libwebp/moz.yaml
--- a/media/libwebp/moz.yaml
+++ b/media/libwebp/moz.yaml
@@ -9,11 +9,11 @@
   description: "WebP codec library"
 
   url: "https://chromium.googlesource.com/webm/libwebp"
   license: BSD-3-Clause
 
-  release: v1.3.2 (2023-09-13T22:11:07Z).
+  release: v1.3.2 (2023-09-13T15:11:07-07:00).
 
   revision: "v1.3.0"
 
   license-file: COPYING
 
diff --git a/media/libwebp/src/dec/vp8l_dec.c b/media/libwebp/src/dec/vp8l_dec.c
--- a/media/libwebp/src/dec/vp8l_dec.c
+++ b/media/libwebp/src/dec/vp8l_dec.c
@@ -1239,24 +1239,13 @@
       goto Error;
     }
   }
 
   br->eos_ = VP8LIsEndOfStream(br);
-  // In incremental decoding:
-  // br->eos_ && src < src_last: if 'br' reached the end of the buffer and
-  // 'src_last' has not been reached yet, there is not enough data. 'dec' has to
-  // be reset until there is more data.
-  // !br->eos_ && src < src_last: this cannot happen as either the buffer is
-  // fully read, either enough has been read to reach 'src_last'.
-  // src >= src_last: 'src_last' is reached, all is fine. 'src' can actually go
-  // beyond 'src_last' in case the image is cropped and an LZ77 goes further.
-  // The buffer might have been enough or there is some left. 'br->eos_' does
-  // not matter.
-  assert(!dec->incremental_ || (br->eos_ && src < src_last) || src >= src_last);
-  if (dec->incremental_ && br->eos_ && src < src_last) {
+  if (dec->incremental_ && br->eos_ && src < src_end) {
     RestoreState(dec);
-  } else if ((dec->incremental_ && src >= src_last) || !br->eos_) {
+  } else if (!br->eos_) {
     // Process the remaining rows corresponding to last row-block.
     if (process_func != NULL) {
       process_func(dec, row > last_row ? last_row : row);
     }
     dec->status_ = VP8_STATUS_OK;