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BIT-pillow-2026-42310 — Pillow: PDF Parsing Trailer Infinite Loop (DoS)

2026-09-30T16:41:05.780656+00:00

Affected: Bitnami: pillow

Pillow is a Python imaging library. From version 4.2.0 to before version 12.2.0, an attacker can supply a malicious PDF that causes the process to hang indefinitely, consuming 100% CPU and making the application unresponsive. This issue has been patched in version 12.2.0.

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

2026-09-30T16:41:05.780825+00:00

Affected: python-pillow Pillow

GHSA-r73j-pqj5-w3x7 — Pillow has a PDF Parsing Trailer Infinite Loop (DoS)

2026-09-30T16:41:05.780888+00:00

Affected: PyPI: pillow

### 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 a trailer's Prev pointer references an offset that has already been processed — either pointing to itself or forming a longer cycle — the parser enters an infinite loop. Pillow now tracks previously processed trailer offsets and raises an error if a cycle is detected.

### Workarounds Use any version but the affected versions: >= 4.2.0, < 12.2.0

### Resources - Fix: https://github.com/python-pillow/Pillow/pull/9519

PYSEC-2026-2874 — Pillow has a PDF Parsing Trailer Infinite Loop (DoS)

2026-09-30T16:41:05.780944+00:00

Affected: PyPI: pillow

### 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.

### Workarounds Use any version but the affected versions: >= 4.2.0, < 12.2.0

### Resources - Fix: https://github.com/python-pillow/Pillow/pull/9519