CVE-2026-115585
High
Description
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.
SeverityHigh
CVSS7.1
Exploit probability—
ProductPypdf
PublishedOct 23, 2026
First seenOct 23, 2026
How to fix
Update
- pypdf6.21.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| pypdfPyPI | v < 6.21.2 | 6.21.2 |
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