{
"id": "GHSA-95q3-8gr9-gm8w",
"aliases": [
"CVE-2021-27923"
],
"details": "Pillow before 8.1.2 allows attackers to cause a denial of service (memory consumption) because the reported size of a contained image is not properly checked for an ICO container, and thus an attempted memory allocation can be very large.",
"summary": "Pillow Denial of Service by Uncontrolled Resource Consumption",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "8.1.2"
}
]
}
],
"package": {
"name": "pillow",
"ecosystem": "PyPI"
}
}
],
"modified": "2025-08-15T13:58:18Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
}
],
"published": "2021-03-18T19:54:43Z",
"references": [
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-27923",
"type": "ADVISORY"
},
{
"url": "https://github.com/python-pillow/Pillow/commit/756fff33128a0b643d10518a26ad04b726dd8973",
"type": "WEB"
},
{
"url": "https://github.com/advisories/GHSA-95q3-8gr9-gm8w",
"type": "ADVISORY"
},
{
"url": "https://github.com/pypa/advisory-database/tree/main/vulns/pillow/PYSEC-2021-42.yaml",
"type": "WEB"
},
{
"url": "https://github.com/python-pillow/Pillow",
"type": "PACKAGE"
},
{
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/S7G44Z33J4BNI2DPDROHWGVG2U7ZH5JU",
"type": "WEB"
},
{
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TQQY6472RX4J2SUJENWDZAWKTJJGP2ML",
"type": "WEB"
},
{
"url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZTSY25UJU7NJUFHH3HWT575LT4TDFWBZ",
"type": "WEB"
},
{
"url": "https://lists.fedoraproject.org/archives/list/[email protected] /message/S7G44Z33J4BNI2DPDROHWGVG2U7ZH5JU",
"type": "WEB"
},
{
"url": "https://lists.fedoraproject.org/archives/list/[email protected] /message/TQQY6472RX4J2SUJENWDZAWKTJJGP2ML",
"type": "WEB"
},
{
"url": "https://lists.fedoraproject.org/archives/list/[email protected] /message/ZTSY25UJU7NJUFHH3HWT575LT4TDFWBZ",
"type": "WEB"
},
{
"url": "https://pillow.readthedocs.io/en/stable/releasenotes/8.1.1.html",
"type": "WEB"
},
{
"url": "https://pillow.readthedocs.io/en/stable/releasenotes/8.1.2.html",
"type": "WEB"
},
{
"url": "https://security.gentoo.org/glsa/202107-33",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-20",
"CWE-400"
],
"severity": "HIGH",
"github_reviewed": true,
"nvd_published_at": "2021-03-03T09:15:00Z",
"github_reviewed_at": "2021-03-12T23:37:20Z"
}
}