pypdf: Possible large memory usage when retrieving alphabetical page labels
### Impact An attacker who uses this vulnerability can craft a PDF which leads to large memory consumption. This requires accessing the page labels of a document with large alphabetical labels. ### Patches This has been fixed in [pypdf==6.19.0](https://github.com/py-pdf/pypdf/releases/tag/6.19.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4096](https://github.com/py-pdf/pypdf/pull/4096).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-103000US | high7.5 | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF can provide unusually large alphabetical page-label values that cause pypdf/_page_labels.py… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/advisories/GHSA-w23x-9jrw-r45cADVISORY
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/0d8b5a8832cde1ba308b5c27567b879b7b7eed4aWEB
- https://github.com/py-pdf/pypdf/pull/4096WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.19.0WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-w23x-9jrw-r45cWEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-103000ADVISORY
- https://pypi.org/project/pypdfPACKAGE
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