pypdf: Possible infinite loop when hitting EOF in standard xref table
### Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires an incomplete file which ends inside the xref table. ### Patches This has been fixed in [pypdf==6.20.0](https://github.com/py-pdf/pypdf/releases/tag/6.20.0). ### Workarounds If you cannot upgrade yet, consider applying the changes from PR [#4170](https://github.com/py-pdf/pypdf/pull/4170). ### Notes This has been reported through both the secure channel and as a public issue at [#4169](https://github.com/py-pdf/pypdf/issues/4169).
describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-113794US | — | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to 6.20.0, an attacker can craft an incomplete PDF that ends inside a standard cross-reference table, causing pypdf t… | ||||
references
External citations — patches, advisories, analysis.
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/37e1cd681744bac38b159f7e1c614eee8d639c58WEB
- https://github.com/py-pdf/pypdf/issues/4169WEB
- https://github.com/py-pdf/pypdf/pull/4170WEB
- https://github.com/py-pdf/pypdf/releases/tag/6.20.0WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-39mj-jf6j-2qj3WEB
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