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-rw-r--r--youtube_dl/compat.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/youtube_dl/compat.py b/youtube_dl/compat.py
index c3783337a..1f4ccf443 100644
--- a/youtube_dl/compat.py
+++ b/youtube_dl/compat.py
@@ -94,6 +94,8 @@ except ImportError:
try:
if not item:
raise ValueError
+ if not re.match('[0-9a-fA-F][0-9a-fA-F]',item[:2]):
+ raise ValueError
pct_sequence += item[:2].decode('hex')
rest = item[2:]
if not rest: