In fetchmail 6.2.5.1, the the remote code injection via POP3 UIDL was fixed, but a denial of service attack was introduced:
Two possible NULL-pointer dereferences allow a malicous POP3 server to crash fetchmail by respondig with UID lines containing only the article number but no UID (in violation of RFC-1939), or a message without Message-ID when no UIDL support is available.
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