Several denial of service vulnerabilities have been discovered in polipo, a small, caching web proxy. The Common Vulnerabilities and Exposures project identifies the following problems: A malicous remote sever could cause polipo to crash by sending an invalid Cache-Control header. A malicous client could cause polipo to crash by sending a large Content-Length value. This upgrade also fixes some other bugs that could lead to a daemon crash or an infinite loop and may be triggerable remotely.