CVSS 3.1
5.5 mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HCVE-2023-46250
Medium (5.5) in pypdf project pypdf. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in pypdf 3.17.0.
pypdf is a free and open-source pure-python PDF library. An attacker who uses a vulnerability present in versions 3.7.0 through 3.16.4 can craft a PDF which leads to an infinite loop. This infinite loop blocks the current process and can utilize a single core of the CPU by 100%. It does not affect memory usage. That is, for example, the case when the pypdf-user manipulates an incoming malicious PDF e.g. by merging it with another PDF or by adding annotations. The issue was fixed in version 3.17.0. As a workaround, apply the patch manually by modifying `pypdf/generic/_data_structures.py`.
Severity
- EPSS
- 0.2% chance of exploitation in the next 30 days; higher than 15% of CVEs (scores of 2026-10-31)
- CWE
- CWE-835
- Published
- Modified
- Record from
- the NVD, synced
Affected
- pypdf_project:pypdf
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-wjcc-cq79-p63f | PyPI | pypdf | >=3.7.0 <3.17.0 | 3.17.0 |
| PYSEC-2026-1834 | PyPI | pypdf | >=3.7.0 <3.17.0 | 3.17.0 |
References
- https://github.com/py-pdf/pypdf/commit/9b23ac3c9619492570011d551d521690de9a3e2d
- https://github.com/py-pdf/pypdf/pull/2264
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-wjcc-cq79-p63f
- https://github.com/py-pdf/pypdf/commit/9b23ac3c9619492570011d551d521690de9a3e2d
- https://github.com/py-pdf/pypdf/pull/2264