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-rw-r--r--mitmproxy/certs.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/mitmproxy/certs.py b/mitmproxy/certs.py
index 83db4e6e..4e4eb4d1 100644
--- a/mitmproxy/certs.py
+++ b/mitmproxy/certs.py
@@ -102,7 +102,7 @@ def dummy_cert(privkey, cacert, commonname, sans):
cert.gmtime_adj_notBefore(-3600 * 48)
cert.gmtime_adj_notAfter(DEFAULT_EXP)
cert.set_issuer(cacert.get_subject())
- if commonname is not None:
+ if commonname is not None and len(commonname) < 64:
cert.get_subject().CN = commonname
cert.set_serial_number(int(time.time() * 10000))
if ss: