pypdf is a free and open-source pure-python PDF library. Prior to 6.21.3, pypdf can consume excessive memory while opening a crafted PDF containing cross-reference streams that declare very large entry counts. Highly compressible streams and /Prev chains can multiply the number of parsed entries across a document, while negative /Index counts can bypass the existing per-stream clamp. This issue is fixed in version 6.21.3.
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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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 6.21.3, pypdf can consume excessive memory while opening a crafted PDF containing cross-reference streams that declare very large entry counts. Highly compressible streams and /Prev chains can multiply the number of parsed entries across a document, while negative /Index counts can bypass the existing per-stream clamp. This issue is fixed in version 6.21.3. | |
| Title | pypdf: Possible large memory usage when parsing cross-reference streams | |
| Weaknesses | CWE-400 CWE-770 |
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| Metrics |
cvssV4_0
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MITRE
Status: PUBLISHED
Assigner: GitHub_M
Published:
Updated: 2026-10-29T20:43:03.072Z
Reserved: 2026-10-29T16:04:48.729Z
Link: CVE-2026-119209
Vulnrichment
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NVD
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OpenCVE Enrichment
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