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