diff --git a/libraries/extractor/src/main/java/androidx/media3/extractor/text/cea/Cea708Decoder.java b/libraries/extractor/src/main/java/androidx/media3/extractor/text/cea/Cea708Decoder.java
index e1c9d127be..64384f7cfe 100644
--- a/libraries/extractor/src/main/java/androidx/media3/extractor/text/cea/Cea708Decoder.java
+++ b/libraries/extractor/src/main/java/androidx/media3/extractor/text/cea/Cea708Decoder.java
@@ -329,7 +329,9 @@ public final class Cea708Decoder extends CeaDecoder {
     // 8.10.4 for more details.
     boolean cuesNeedUpdate = false;
 
-    while (serviceBlockPacket.bitsLeft() > 0) {
+    int blockEndBitPosition = serviceBlockPacket.getPosition() + (blockSize * 8);
+    while (serviceBlockPacket.bitsLeft() > 0
+        && serviceBlockPacket.getPosition() < blockEndBitPosition) {
       int command = serviceBlockPacket.readBits(8);
       if (command != COMMAND_EXT1) {
         if (command <= GROUP_C0_END) {