{
"id": "GHSA-fp3f-mc75-235c",
"aliases": [
"CVE-2026-71870"
],
"details": "### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires parsing the `/ToUnicode` entry of a font with unusually large values, for example during text extraction.\n\n### Patches\n\nThis has been fixed in [pypdf==6.15.0](https://github.com/py-pdf/pypdf/releases/tag/6.15.0).\n\n### Workarounds\n\nIf you cannot upgrade yet, consider applying the changes from PR [#3944](https://github.com/py-pdf/pypdf/pull/3944).",
"summary": "pypdf: Possible large memory usage for large /ToUnicode streams",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "6.15.0"
}
]
}
],
"package": {
"name": "pypdf",
"ecosystem": "PyPI"
}
}
],
"modified": "2026-08-07T19:29:09Z",
"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": "2026-08-07T19:29:09Z",
"references": [
{
"url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3f-mc75-235c",
"type": "WEB"
},
{
"url": "https://github.com/py-pdf/pypdf/pull/3944",
"type": "WEB"
},
{
"url": "https://github.com/py-pdf/pypdf/commit/afba8080e19d29a3c256a742b340995e695b35aa",
"type": "WEB"
},
{
"url": "https://github.com/py-pdf/pypdf",
"type": "PACKAGE"
},
{
"url": "https://github.com/py-pdf/pypdf/releases/tag/6.15.0",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-400"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": null,
"github_reviewed_at": "2026-08-07T19:29:09Z"
}
}