CVE-2026-42310: Pillow has a PDF Parsing Trailer Infinite Loop (DoS)

May 4, 2026

An attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive.

References

github.com/advisories/GHSA-r73j-pqj5-w3x7
github.com/python-pillow/Pillow
github.com/python-pillow/Pillow/pull/9519
github.com/python-pillow/Pillow/security/advisories/GHSA-r73j-pqj5-w3x7
nvd.nist.gov/vuln/detail/CVE-2026-42310

Code Behaviors & Features

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