CVE-2026-84311
pypdf: Possible long runtimes/large memory usage when extracting XForm objects
- State
- Published
- Severity
- 4.8 Medium
- Published
- Sep 1, 2026
- Updated
- Sep 2, 2026
- Reserved
- Sep 1, 2026
Description
pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 4.8 Medium | CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N | GitHub_M |
Weaknesses
- CWE-834 Excessive Iteration
Affected Products
| Product | Versions |
|---|---|
pypdfpy-pdf |
|
References
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