Low
pypdf has possible long runtimes for missing /Root object with large /Size values
Type: advisorySources: OSV
pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for missing /Root object with large /Size values. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for actually invalid files. This can be achieved by omitting the /Root entry in the trailer, while using a rather large /Size value. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-22690
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 23:30 UTC · Revision 1
Source evidence
pypdf has possible long runtimes for missing /Root object with large /Size values
core-osv · Original sourcePublished 10 Jan 2026, 04:41 UTC
pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for missing /Root object with large /Size values. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for actually invalid files. This can be achieved by omitting the /Root entry in the trailer, while using a rather large /Size value. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.
osv:CVE-2026-22690
Complete source record
{
"id": "39c7bfefb84cc205fd0f99e67f947b17902f2fdf20b68e07669ff2993a38fe6b",
"url": "https://osv.dev/vulnerability/CVE-2026-22690",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "pypdf has possible long runtimes for missing /Root object with large /Size values",
"summary": "pypdf is a free and open-source pure-python PDF library. Prior to version 6.6.0, pypdf has possible long runtimes for missing /Root object with large /Size values. An attacker who uses this vulnerability can craft a PDF which leads to possibly long runtimes for actually invalid files. This can be achieved by omitting the /Root entry in the trailer, while using a rather large /Size value. Only the non-strict reading mode is affected. This issue has been patched in version 6.6.0.",
"evidence": "osv:CVE-2026-22690",
"products": [],
"severity": "low",
"structured": {
"id": "CVE-2026-22690",
"aliases": [
"CVE-2026-22690",
"GHSA-4xc4-762w-m6cg",
"PYSEC-2026-1829"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U"
}
],
"affected": [
{
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"type": "GIT",
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{
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{
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"cpe": "cpe:2.3:a:pypdf_project:pypdf:*:*:*:*:*:*:*:*",
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{
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"source": "CPE_RANGE"
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{
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"source": "REFERENCES_COMMIT"
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{
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"source": "REFERENCES_TAG",
"original_tag": "6.6.0"
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-22690.json"
}
}
],
"modified": "2026-10-28T02:30:24.300358239Z",
"provider": "osv",
"references": [
"https://github.com/py-pdf/pypdf/releases/tag/6.6.0",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22690.json",
"https://github.com/py-pdf/pypdf/security/advisories/GHSA-4xc4-762w-m6cg",
"https://nvd.nist.gov/vuln/detail/CVE-2026-22690",
"https://github.com/py-pdf/pypdf/commit/294165726b646bb7799be1cc787f593f2fdbcf45",
"https://github.com/py-pdf/pypdf/pull/3594"
],
"provider_metadata": {
"cwe_ids": [
"CWE-400"
],
"cna_assigner": "GitHub_M",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/22xxx/CVE-2026-22690.json"
}
},
"related_cves": [
{
"value": "CVE-2026-22690",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 490891,
"published_at": "2026-01-10T04:41:20.773+00:00"
}