Pillow: TarIO negative size field causes infinite CPU-spin loop

影響: pip:Pillow < 13.0.0 → 13.0.0

TarIO.__init__ does not check that a tar header's size field is positive. A crafted header with a negative size makes it seek backward onto itself. This causes an infinite loop that uses 100% CPU and never returns. Details TarIO.__init__ reads 512-byte tar headers one at a time, looking for a member with a given name. For each header it reads the size field and skips ahead to the next header: python size = int(s[124:135], 8) ... self.fh.seek((size + 511) & (~511), io.SEEK_CUR) There is no check…

在 GitHub Advisory Database 阅读

2026/10/23 01:01，GitHub Advisory Database 发布了“Pillow: TarIO negative size field causes infinite CPU-spin loop”（类型：漏洞公告）。严重程度为“高危”（high）。相关技术：Python。CVE：CVE-2026-96642。