pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can consume excessive memory while parsing a crafted PDF page tree containing many shared resources. Page-tree flattening copies page dictionary and inherited resource entries without a document-wide entry budget, allowing the crafted resource structure to cause disproportionate allocations. This issue is fixed in version 6.21.4.
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| py-pdf | pypdf | affected |
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References
History
Thu, 29 Oct 2026 20:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Description | pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can consume excessive memory while parsing a crafted PDF page tree containing many shared resources. Page-tree flattening copies page dictionary and inherited resource entries without a document-wide entry budget, allowing the crafted resource structure to cause disproportionate allocations. This issue is fixed in version 6.21.4. | |
| Title | pypdf: Possible large memory usage when parsing page tree | |
| Weaknesses | CWE-400 | |
| References |
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| Metrics |
cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-10-29T20:34:02.704Z
Reserved: 2026-10-29T16:04:48.729Z
Link: CVE-2026-119204
Vulnrichment
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NVD
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Redhat
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OpenCVE Enrichment
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Weaknesses