high7.1
CVE-2026-119203
pypdf has possible infinite loop when hitting EOF in standard xref table during trailer search
Impact
pypdf is a free and open-source pure-python PDF library. Prior to 6.21.4, pypdf can enter an infinite loop while opening a crafted incomplete PDF whose standard cross-reference table reaches the end of the file without a trailer. The trailer search can repeatedly rewind to the same stream position instead of terminating when parsing makes no progress, blocking the processing thread. This issue is fixed in version 6.21.4.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.21.4 | 6.21.4 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Py-Pdf | Pypdf | before 6.21.4 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-5849-834g-hvw5
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-5849-834g-hvw5
- https://nvd.nist.gov/vuln/detail/CVE-2026-119203
- https://github.com/py-pdf/pypdf/pull/4289
- https://github.com/py-pdf/pypdf/commit/06593f993789a4b573dd955730c1a7051128bb2a
- https://github.com/py-pdf/pypdf/releases/tag/6.21.4