Tornado: Event loop blocking and excess memory use from chunked bodies with many small chunks

影響: pip:tornado < 6.6 → 6.6

When Tornado reads an HTTP/1.1 body that uses chunked transfer encoding, it processes all chunks that have already arrived without yielding to the event loop. A client can send a body made of millions of 1-byte chunks, which blocks the event loop (and therefore every other connection served by that process) for the entire time it takes to parse the body. A body near the default max_body_size of 100 MB can block the process for close to a minute, and the attacker can repeat or parallelize these…

在 GitHub Advisory Database 阅读

2026/10/29 07:43，GitHub Advisory Database 发布了“Tornado: Event loop blocking and excess memory use from chunked bodies with many small chunks”（类型：漏洞公告）。严重程度为“中危”（medium）。相关技术：Python。CVE：CVE-2026-115927。