pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can take excessive time to retrieve page labels from a crafted PDF containing a flat page-label number tree with many ranges. The page_labels property resolves each page independently and repeatedly scans the same /Nums array from the beginning, causing work to grow with both the page count and the number of label ranges. This issue is fixed in version 6.21.3.
{
"cna_assigner": "GitHub_M",
"cwe_ids": [
"CWE-400"
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/119xxx/CVE-2026-119206.json"
}{
"extracted_events": [
{
"cpe": "cpe:2.3:a:py-pdf:pypdf:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "6.21.3"
}
],
"source": "CPE_RANGE"
},
{
"range": [
{
"fixed": "b891fef37000cd86baa6e9848a3387d080b3b03e"
}
],
"source": "REFERENCES_COMMIT"
},
{
"original_tag": "6.21.3",
"range": [
{
"fixed": "a9f9c4f16f1fb6b48be089ef6eae250dbaef5d23"
}
],
"source": "REFERENCES_TAG"
}
]
}