pypdf: Possible long runtimes/large memory usage when parsing indirect objects
### Impact An attacker who uses this vulnerability can craft a PDF which leads to long runtimes. This requires reading a PDF document with long indirect object headers, not terminated by whitespace. ### Patches This has been fixed in [pypdf==6.18.0](https://github.com/py-pdf/pypdf/releases/tag/6.18.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4055](https://github.com/py-pdf/pypdf/pull/4055).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-102994US | high7.5 | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to 6.18.0, a crafted PDF containing indirect-object identifiers or generation-number tokens that continue for a long… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/82501d2993c6387833c4949d205caeb188f8bb9eWEB
- https://github.com/py-pdf/pypdf/pull/4055WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.18.0WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-5jq2-8x83-x246WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-102994ADVISORY
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