{
"id": "GHSA-jm82-fx9c-mx94",
"aliases": [],
"details": "### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to large memory usage, as `MAX_DECLARED_STREAM_LENGTH` is sometimes ignored. This requires parsing a content stream without a `/Length` value.\n\n### Patches\nThis has been fixed in [pypdf==6.13.3](https://github.com/py-pdf/pypdf/releases/tag/6.13.3).\n\n### Workarounds\nIf you cannot upgrade yet, consider applying the changes from PR [#3871](https://github.com/py-pdf/pypdf/pull/3871).",
"summary": "pypdf: Missing stream length values ignore defined limits",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "6.13.3"
}
]
}
],
"package": {
"name": "pypdf",
"ecosystem": "PyPI"
}
}
],
"modified": "2026-06-18T14:28:50Z",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"
}
],
"published": "2026-06-18T14:28:49Z",
"references": [
{
"url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-jm82-fx9c-mx94",
"type": "WEB"
},
{
"url": "https://github.com/py-pdf/pypdf/pull/3871",
"type": "WEB"
},
{
"url": "https://github.com/py-pdf/pypdf",
"type": "PACKAGE"
},
{
"url": "https://github.com/py-pdf/pypdf/releases/tag/6.13.3",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-400",
"CWE-770"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": null,
"github_reviewed_at": "2026-06-18T14:28:49Z"
}
}