{
"id": "GHSA-248m-82v9-q6g6",
"aliases": [
"CVE-2026-48156"
],
"details": "### Impact\n\nAn attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires cross-reference streams with `/W [0 0 0]` values and large `/Size` values.\n\n### Patches\n\nThis has been fixed in [pypdf==6.12.0](https://github.com/py-pdf/pypdf/releases/tag/6.12.0).\n\n### Workarounds\n\nIf developers are unable to upgrade their apps immediately, they should consider applying the changes from PR [#3791](https://github.com/py-pdf/pypdf/pull/3791).",
"summary": "pypdf: Possible long runtimes for zero-only width values in cross-reference streamsuntimes for zero-only width values in cross-reference streams",
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "6.12.0"
}
]
}
],
"package": {
"name": "pypdf",
"ecosystem": "PyPI"
}
}
],
"modified": "2026-06-12T18:29:59Z",
"severity": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L"
},
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"
}
],
"published": "2026-06-12T18:29:59Z",
"references": [
{
"url": "https://github.com/py-pdf/pypdf/security/advisories/GHSA-248m-82v9-q6g6",
"type": "WEB"
},
{
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-48156",
"type": "ADVISORY"
},
{
"url": "https://github.com/py-pdf/pypdf/pull/3791",
"type": "WEB"
},
{
"url": "https://github.com/py-pdf/pypdf/commit/507d7c9aa6ea83389b954b9c3c0c528fe5d5da70",
"type": "WEB"
},
{
"url": "https://github.com/py-pdf/pypdf",
"type": "PACKAGE"
},
{
"url": "https://github.com/py-pdf/pypdf/releases/tag/6.12.0",
"type": "WEB"
}
],
"schema_version": "1.4.0",
"database_specific": {
"cwe_ids": [
"CWE-834"
],
"severity": "MODERATE",
"github_reviewed": true,
"nvd_published_at": "2026-05-28T16:16:29Z",
"github_reviewed_at": "2026-06-12T18:29:59Z"
}
}