Low severity3.3NVD Advisory· Published Sep 1, 2026· Updated Oct 5, 2026
CVE-2026-84311
CVE-2026-84311
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
pypdfPyPI | < 6.16.1 | 6.16.1 |
Affected products
1Patches
Vulnerability mechanics
References
5- github.com/py-pdf/pypdf/commit/d91ab705fd81ed1a9cec175c6958600dea1a4942nvdPatchWEB
- github.com/py-pdf/pypdf/pull/3966nvdPatchWEB
- github.com/py-pdf/pypdf/security/advisories/GHSA-763m-79hh-57f2nvdPatchVendor AdvisoryWEB
- github.com/advisories/GHSA-763m-79hh-57f2ghsaADVISORY
- github.com/py-pdf/pypdf/releases/tag/6.16.1nvdRelease NotesWEB
News mentions
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