pypdf has a possible infinite loop when loading circular /Prev entries in cross-reference streams
### Impact An attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires reading the file. ### Patches This has been fixed in [pypdf==6.7.2](https://github.com/py-pdf/pypdf/releases/tag/6.7.2). ### Workarounds If users cannot upgrade yet, consider applying the changes from PR [#3655](https://github.com/py-pdf/pypdf/pull/3655).
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2026-27628US | high7.5 | — | ||
pypdf is a free and open-source pure-python PDF library. Prior to 6.7.2, an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop. This requires read… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/advisories/GHSA-2rw7-x74f-jg35ADVISORY
- https://github.com/py-pdf/pypdfPACKAGE
- https://github.com/py-pdf/pypdf/commit/f0a462d36971cf077d74492a348d0d06fd60ea4dWEB
- https://github.com/py-pdf/pypdf/issues/3654WEB
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-2rw7-x74f-jg35WEB
- https://nvd.nist.gov/vuln/detail/CVE-2026-27628ADVISORY
- https://pypi.org/project/pypdfPACKAGE
scry
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