Vendor
A denial-of-service vulnerability (CVE-2026-59200) exists in Pillow's `PdfParser.PdfStream.decode()` function across versions 5.1.0 to 12.2.x, allowing an unauthenticated attacker to craft a malicious PDF file that, when processed by a vulnerable application, triggers excessive memory allocation (e.g., a ~950 KB file expanding to 1 GB), leading to server Out-of-Memory termination or severe service degradation.