high7.5
CVE-2026-102994
pypdf: Possible long runtimes/large memory usage when parsing indirect objects
Impact
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 time without whitespace can cause pypdf/_reader.py and pypdf/generic/_base.py to scan excessive input through read_until_whitespace, resulting in long runtimes and application unavailability. This issue is fixed in version 6.18.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.18.0 | 6.18.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pypdf Project | Pypdf | before 6.18.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-5jq2-8x83-x246
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-5jq2-8x83-x246
- https://nvd.nist.gov/vuln/detail/CVE-2026-102994
- https://github.com/py-pdf/pypdf/pull/4055
- https://github.com/py-pdf/pypdf/commit/82501d2993c6387833c4949d205caeb188f8bb9e
- https://github.com/py-pdf/pypdf/releases/tag/6.18.0