Pillow has a PDF Parsing Trailer Infinite Loop (DoS)

Impact An attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. Patches Patched version: 12.2.0. PdfParser introduced in Pillow 4.2.0 follows Prev pointers in PDF trailers to read cross-reference sections. If ...

PT-2026-37199

Name of the Vulnerable Software and Affected Versions Pillow versions 4.2.0 through 12.1.x Description A flaw in the PdfParser allows an attacker to supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. This occurs because...