pypdf: Possible large memory usage when retrieving Roman 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 Roman numerals. ### Patches This has been fixed in [pypdf==6.17.0](https://github.com/py-pdf/pypdf/releases/tag/6.17.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4047](https://github.com/py-pdf/pypdf/pull/4047).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-102993US | high7.5 | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to 6.17.0, a crafted PDF can provide unusually large Roman page-label values that cause pypdf/_page_labels.py to gene… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/89db7c4fe9315ecc964bfdf05a4e8c4b94175163WEB
- https://github.com/py-pdf/pypdf/pull/4047WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.17.0WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-qv6h-rv94-w285WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-102993ADVISORY
scry
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