Resource exhaustion in Py-Pdf Pypdf
CVE-2026-115585
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.2, an incomplete remediation for repeated malformed cross-reference entries in GHSA-55h5-xmcq-c37v could still trigger a complete PDF stream reload during each recovery attempt even when a recovery cache was present, causing crafted cross-reference streams to produce long runtimes. This issue is fixed in version 6.21.2.
Vulnerability class: DoS (Denial of Service)
Published .
EPSS exploit prediction
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Affected products
- Py-Pdf Pypdf — versions < 6.21.2