high7.5
CVE-2026-102998
pypdf: Possible long runtimes when generating appearance streams
Impact
pypdf is a free and open-source pure-python PDF library. Prior to 6.19.0, a crafted PDF with form field values can cause pypdf/generic/_appearance_stream.py appearance-stream generation to repeat invariant selection-data work inside a loop when an application updates fields with flattening enabled, resulting in excessive runtimes and application unavailability. This issue is fixed in version 6.19.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.19.0 | 6.19.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pypdf Project | Pypdf | before 6.19.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-php9-fj8v-98fj
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-php9-fj8v-98fj
- https://nvd.nist.gov/vuln/detail/CVE-2026-102998
- https://github.com/py-pdf/pypdf/pull/4087
- https://github.com/py-pdf/pypdf/commit/959467a9b95be83e2dc5ae873ece5f371263ede7
- https://github.com/py-pdf/pypdf/releases/tag/6.19.0