{
"id": "GHSA-23w6-3w8w-8484",
"aliases": [
"CVE-2026-84310"
],
"details": "### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes and large memory consumption. This requires accessing the outlines of a document with either lots of entries or nested outlines with long re-used nesting paths.\n\n### Patches\n\nThis has been fixed in [pypdf==6.16.1](https://github.com/py-pdf/pypdf/releases/tag/6.16.1).\n\n### Workarounds\n\nIf you cannot upgrade yet, consider applying the changes from PR [#3966](https://github.com/py-pdf/pypdf/pull/3966).",
"summary": "pypdf: Possible long runtimes/large memory usage when retrieving outlines",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "6.16.1"
}
]
}
],
"package": {
"name": "pypdf",
"ecosystem": "PyPI"
}
}
],
"modified": "2026-09-01T21:28:38Z",
"severity": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
}
],
"published": "2026-09-01T21:28:37Z",
"references": [
{
"url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-23w6-3w8w-8484",
"type": "WEB"
},
{
"url": "https://github.com/py-pdf/pypdf/pull/3966",
"type": "WEB"
},
{
"url": "https://github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942",
"type": "WEB"
},
{
"url": "https://github.com/py-pdf/pypdf",
"type": "PACKAGE"
},
{
"url": "https://github.com/py-pdf/pypdf/releases/tag/6.16.1",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-405",
"CWE-834"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": null,
"github_reviewed_at": "2026-09-01T21:28:37Z"
}
}