medium5.5
CVE-2026-31826
pypdf is a free and open-source pure-python PDF library.
Impact
pypdf is a free and open-source pure-python PDF library. Prior to 6.8.0, an attacker who uses this vulnerability can craft a PDF which leads to large memory usage. This requires parsing a content stream with a rather large /Length value, regardless of the actual data length inside the stream. This vulnerability is fixed in 6.8.0.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.8.0 | 6.8.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pypdf Project | Pypdf | before 6.8.0 |
| Py-Pdf | Pypdf | before 6.8.0 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/py-pdf/pypdf/pull/3675
- https://github.com/py-pdf/pypdf/releases/tag/6.8.0
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-hqmh-ppp3-xvm7
- https://github.com/advisories/GHSA-hqmh-ppp3-xvm7
- https://github.com/py-pdf/pypdf/commit/3c550b3196adeba1506a26e57c09c09fac75e9aa
- https://nvd.nist.gov/vuln/detail/CVE-2026-31826