HighFix available
pillow — security advisory
Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.
- Products
- pillow
- Affected versions
- 10.0.0-1, 10.1.0-1, 10.2.0-1, 10.3.0-1, 10.3.0-2, 10.4.0-1, 10.4.0-1.1, 11.1.0-1, 11.1.0-2, 11.1.0-3, 11.1.0-4, 11.1.0-5, 11.1.0-5+deb13u1, 11.1.0-5+deb13u2, 11.1.0-5+deb13u3, 11.1.0-5+deb13u4, 11.2.1-1, 11.3.0-1, 12.0.0-1, 12.1.0-1, 12.1.1-1, 12.1.1-2, 12.2.0-1, 12.3.0-1, 13.0.0-1, 9.4.0-1.1, 9.4.0-1.1+deb12u1, 9.5.0-1
- Fixed versions
- 12.3.0-1
- CVEs
- CVE-2026-59197
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 09:57 UTC · Revision 2
Source evidence
Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.
osv:DEBIAN-CVE-2026-59197
pillow
Fixed versions: Not specified
pillow
Fixed versions: Not specified
pillow
Fixed versions: 12.3.0-1
Complete source record
{
"id": "3436f614c0e4ea3a4a15b62c9c92748a352a68f17b72159c3f3f1cb9d4242e4c",
"url": "https://osv.dev/vulnerability/DEBIAN-CVE-2026-59197",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "DEBIAN-CVE-2026-59197",
"summary": "Pillow is a Python imaging library. Prior to 12.3.0, Pillow's public rank-filter API can trigger a native heap out-of-bounds write when given a very large odd filter size because ImageFilter.RankFilter.filter() calls image.expand(size // 2, size // 2) before rank-filter size validation and ImagingExpand() computes output dimensions with unchecked signed int arithmetic. This issue is fixed in version 12.3.0.",
"evidence": "osv:DEBIAN-CVE-2026-59197",
"products": [
{
"name": {
"value": "pillow",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "10.0.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.1.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.2.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.3.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.3.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "10.4.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "10.4.0-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "11.1.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "11.1.0-2",
"evidence": "/affected/0/versions"
},
{
"value": "11.1.0-3",
"evidence": "/affected/0/versions"
},
{
"value": "11.1.0-4",
"evidence": "/affected/0/versions"
},
{
"value": "11.1.0-5",
"evidence": "/affected/0/versions"
},
{
"value": "11.2.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "11.3.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "12.0.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "12.1.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "12.1.1-1",
"evidence": "/affected/0/versions"
},
{
"value": "12.1.1-2",
"evidence": "/affected/0/versions"
},
{
"value": "12.2.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "12.3.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "13.0.0-1",
"evidence": "/affected/0/versions"
},
{
"value": "9.4.0-1.1",
"evidence": "/affected/0/versions"
},
{
"value": "9.4.0-1.1+deb12u1",
"evidence": "/affected/0/versions"
},
{
"value": "9.5.0-1",
"evidence": "/affected/0/versions"
}
]
},
{
"name": {
"value": "pillow",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [],
"affected_versions": [
{
"value": "11.1.0-5",
"evidence": "/affected/1/versions"
},
{
"value": "11.1.0-5+deb13u1",
"evidence": "/affected/1/versions"
},
{
"value": "11.1.0-5+deb13u2",
"evidence": "/affected/1/versions"
},
{
"value": "11.1.0-5+deb13u3",
"evidence": "/affected/1/versions"
},
{
"value": "11.1.0-5+deb13u4",
"evidence": "/affected/1/versions"
},
{
"value": "11.2.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "11.3.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "12.0.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "12.1.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "12.1.1-1",
"evidence": "/affected/1/versions"
},
{
"value": "12.1.1-2",
"evidence": "/affected/1/versions"
},
{
"value": "12.2.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "12.3.0-1",
"evidence": "/affected/1/versions"
},
{
"value": "13.0.0-1",
"evidence": "/affected/1/versions"
}
]
},
{
"name": {
"value": "pillow",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "12.3.0-1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": [
{
"value": "11.1.0-5",
"evidence": "/affected/2/versions"
},
{
"value": "11.2.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "11.3.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "12.0.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "12.1.0-1",
"evidence": "/affected/2/versions"
},
{
"value": "12.1.1-1",
"evidence": "/affected/2/versions"
},
{
"value": "12.1.1-2",
"evidence": "/affected/2/versions"
},
{
"value": "12.2.0-1",
"evidence": "/affected/2/versions"
}
]
}
],
"severity": "high",
"structured": {
"id": "DEBIAN-CVE-2026-59197",
"aliases": [
"DEBIAN-CVE-2026-59197"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H"
}
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pillow",
"purl": "pkg:deb/debian/pillow?arch=source&distro=bookworm",
"ecosystem": "Debian:12"
},
"versions": [
"10.0.0-1",
"10.1.0-1",
"10.2.0-1",
"10.3.0-1",
"10.3.0-2",
"10.4.0-1",
"10.4.0-1.1",
"11.1.0-1",
"11.1.0-2",
"11.1.0-3",
"11.1.0-4",
"11.1.0-5",
"11.2.1-1",
"11.3.0-1",
"12.0.0-1",
"12.1.0-1",
"12.1.1-1",
"12.1.1-2",
"12.2.0-1",
"12.3.0-1",
"13.0.0-1",
"9.4.0-1.1",
"9.4.0-1.1+deb12u1",
"9.5.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59197.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
}
]
}
],
"package": {
"name": "pillow",
"purl": "pkg:deb/debian/pillow?arch=source&distro=trixie",
"ecosystem": "Debian:13"
},
"versions": [
"11.1.0-5",
"11.1.0-5+deb13u1",
"11.1.0-5+deb13u2",
"11.1.0-5+deb13u3",
"11.1.0-5+deb13u4",
"11.2.1-1",
"11.3.0-1",
"12.0.0-1",
"12.1.0-1",
"12.1.1-1",
"12.1.1-2",
"12.2.0-1",
"12.3.0-1",
"13.0.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59197.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "12.3.0-1"
}
]
}
],
"package": {
"name": "pillow",
"purl": "pkg:deb/debian/pillow?arch=source&distro=forky",
"ecosystem": "Debian:14"
},
"versions": [
"11.1.0-5",
"11.2.1-1",
"11.3.0-1",
"12.0.0-1",
"12.1.0-1",
"12.1.1-1",
"12.1.1-2",
"12.2.0-1"
],
"database_specific": {
"source": "https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-59197.json"
},
"ecosystem_specific": {
"urgency": "not yet assigned"
}
}
],
"modified": "2026-10-25T10:01:03.061211745Z",
"provider": "osv",
"upstream": [
"CVE-2026-59197"
],
"references": [
"https://security-tracker.debian.org/tracker/CVE-2026-59197"
]
},
"related_cves": [
{
"value": "CVE-2026-59197",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 445394,
"published_at": "2026-07-14T17:17:14.487+00:00"
}