high7.5
CVE-2026-27888
pypdf: Manipulated FlateDecode XFA streams can exhaust RAM
Impact
### Impact An attacker who uses this vulnerability can craft a PDF which leads to the RAM being exhausted. This requires accessing the `xfa` property of a reader or writer and the corresponding stream being compressed using `/FlateDecode`. ### Patches This has been fixed in [pypdf==6.7.3](https://github.com/py-pdf/pypdf/releases/tag/6.7.3). ### Workarounds If projects cannot upgrade yet, consider applying the changes from PR [#3658](https://github.com/py-pdf/pypdf/pull/3658).
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.7.3 | 6.7.3 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pypdf Project | Pypdf | before 6.7.3 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/py-pdf/pypdf/commit/7a4c8246ed48d9d328fb596942271da47b6d109c
- https://github.com/py-pdf/pypdf/pull/3658
- https://github.com/py-pdf/pypdf/releases/tag/6.7.3
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-x7hp-r3qg-r3cj
- https://github.com/advisories/GHSA-x7hp-r3qg-r3cj
- https://nvd.nist.gov/vuln/detail/CVE-2026-27888