high7.5
CVE-2026-102995
pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)
Impact
pypdf is a free and open-source pure-python PDF library. Prior to 6.18.1, a crafted PDF can place unusually large source-code or destination-string tokens in a font /ToUnicode mapping, causing pypdf/_cmap.py parse_bfchar to decode and retain oversized values during operations such as text extraction and consume excessive memory. This is a second follow-up to earlier /ToUnicode resource-consumption fixes and is limited to the remaining token-length path. This issue is fixed in version 6.18.1.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | pypdf | < 6.18.1 | 6.18.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pypdf Project | Pypdf | before 6.18.1 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-fp3h-c4fm-7vvf
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-fp3h-c4fm-7vvf
- https://nvd.nist.gov/vuln/detail/CVE-2026-102995
- https://github.com/py-pdf/pypdf/pull/4071
- https://github.com/py-pdf/pypdf/commit/319d0b823ce2c311a2435e9fd93c13994d32bb51
- https://github.com/py-pdf/pypdf/releases/tag/6.18.1