CVE-2025-64503
Publication date 12 November 2025
Last updated 20 November 2025
Ubuntu priority
Description
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| cups-filters | 25.10 questing |
Not affected
|
| 25.04 plucky |
Not affected
|
|
| 24.04 LTS noble |
Not affected
|
|
| 22.04 LTS jammy |
Needs evaluation
|
|
| 20.04 LTS focal |
Needs evaluation
|
|
| 18.04 LTS bionic |
Needs evaluation
|
|
| 16.04 LTS xenial |
Needs evaluation
|
|
| libcupsfilters | 25.10 questing |
Fixed 2.1.1-0ubuntu3.1
|
| 25.04 plucky |
Fixed 2.1.1-0ubuntu2.1
|
|
| 24.04 LTS noble |
Fixed 2.0.0-0ubuntu7.2
|
|
| 22.04 LTS jammy | Not in release |
Notes
mdeslaur
filename changed from pdftoraster.cxx to pdftoraster.c in newer versions In cups-filters 2.x, this is just a wrapper
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
4.0 · Medium
|
| Attack vector | Local |
| Attack complexity | Low |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | None |
| Integrity impact | None |
| Availability impact | Low |
| Vector | CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
References
Related Ubuntu Security Notices (USN)
- USN-7878-1
- cups-filters vulnerabilities
- 20 November 2025
- USN-7877-1
- libcupsfilters vulnerabilities
- 20 November 2025