cups-filters, libcupsfilters — security advisory
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.
- Products
- cups-filters, libcupsfilters
- Affected versions
- 1.28.17-3, 1.28.17-3+deb12u1, 1.28.17-6, 2.0.0-3, 2.1.1-1
- Fixed versions
- 1.28.17-3+deb12u2, 1.28.17-6+deb13u1, 1.28.17-7, 2.0.0-3+deb13u1, 2.1.1-2
- CVEs
- CVE-2025-64503
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 31 Oct 2026, 23:36 UTC · Revision 1
Source evidence
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.
osv:DEBIAN-CVE-2025-64503
cups-filters
Fixed versions: 1.28.17-3+deb12u2
cups-filters
Fixed versions: 1.28.17-6+deb13u1
cups-filters
Fixed versions: 1.28.17-7
libcupsfilters
Fixed versions: 2.0.0-3+deb13u1
libcupsfilters
Fixed versions: 2.1.1-2
Complete source record
{
"id": "20863a4e370241fc5668ec5b28b109e8b09e33d254beb33fa495554814e604ca",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2025-64503",
"method": "structured",
"payload": {
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"title": "DEBIAN-CVE-2025-64503",
"summary": "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.",
"evidence": "osv:DEBIAN-CVE-2025-64503",
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"aliases": [
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"metrics": [
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"ecosystem": "Debian:12"
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"versions": [
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],
"modified": "2026-10-23T17:47:48.017385368Z",
"provider": "osv",
"upstream": [
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],
"references": [
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"evidence": "/upstream"
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"security_relevant": true,
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},
"source_id": "core-osv",
"document_id": 419011,
"published_at": "2025-11-12T22:15:50.293+00:00"
}