# CVE-2025-64503: cups-filters contains backends, filters, and other software required to get the cups printing service working on…

Source: https://junglewise.ai/threats/cve-2025-64503-cups-filters-contains-backends-filters-and-other-software  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-11-12  
License: CC BY 4.0 with a link back

CVE-2025-64503 · Severity: medium · CVSS 4 · Published 2025-11-12

cups-filters contains backends, filters, and other software required to get the cups printing service working on operating systems other than macos. In cups-filters prior to 1.28.18, by crafting a PDF file with a large `MediaBox` value, an attacker can cause CUPS-Filter 1.x’s `pdftoraster` tool to write beyond the bounds of an array. First, a PDF with a large `MediaBox` width value causes `header.cupsWidth` to become large.  Next, the calculation of `bytesPerLine = (header.cupsBitsPerPixel * header.cupsWidth + 7) / 8` overflows, resulting in a small value. Then, `lineBuf` is allocated with the small `bytesPerLine` size. Finally, `convertLineChunked` calls `writePixel8`, which attempts to write to `lineBuf` outside of its buffer size (out of bounds write). In libcupsfilters, the maintainers found the same `bytesPerLine` multiplication without overflow check, but the provided test case does not cause an overflow there, because the values are different. Commit 50d94ca0f2fa6177613c97c59791bde568631865 contains a patch, which is incorporated into cups-filters version 1.28.18.

Technologies: [OpenPrinting Cups-Filters](https://junglewise.ai/threats/technologies/cups-filters), [OpenPrinting Libcupsfilters](https://junglewise.ai/threats/technologies/libcupsfilters). Vendors: [OpenPrinting](https://junglewise.ai/threats/vendors/openprinting).

## Quick answers

**Is CVE-2025-64503 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-64503 being exploited in the wild.

**How severe is CVE-2025-64503?** Medium severity, with a CVSS score of 4, published 12 November 2025.

**Which products and versions are affected?** OpenPrinting Cups-Filters, OpenPrinting Libcupsfilters. The advisory does not name versions.

**Is there a fix for CVE-2025-64503?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2025-64503?** Check whether you run OpenPrinting Cups-Filters or OpenPrinting Libcupsfilters. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- OpenPrinting Cups-Filters
- OpenPrinting Libcupsfilters

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