CVSS 3.1
5.5 mediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:HCVE-2023-36464
Medium (5.5). EPSS 0.4% chance of exploitation in the next 30 days. Fixed in pypdf 3.9.0.
pypdf is an open source, pure-python PDF library. In affected versions an attacker may craft a PDF which leads to an infinite loop if `__parse_content_stream` is executed. That is, for example, the case if the user extracted text from such a PDF. This issue was introduced in pull request #969 and resolved in pull request #1828. Users are advised to upgrade. Users unable to upgrade may modify the line `while peek not in (b"\r", b"\n")` in `pypdf/generic/_data_structures.py` to `while peek not in (b"\r", b"\n", b"")`.
Severity
- EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 28% of CVEs (scores of 2026-10-31)
- CWE
- CWE-835
- Published
- Modified
- Record from
- the NVD, synced
Affected
- pypdf2_project:pypdf2
- pypdf_project:pypdf
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-4vvm-4w3v-6mr8 | PyPI | pypdf | >=3.1.0 <3.9.0 | 3.9.0 |
| GHSA-4vvm-4w3v-6mr8 | PyPI | pypdf2 | >=2.2.0 <=3.0.1 | no fix published |
| PYSEC-2026-1835 | PyPI | pypdf2 | >=2.2.0 <3.9.0 | 3.9.0 |
| PYSEC-2026-3008 | PyPI | pypdf | >=3.1.0 <3.9.0 | 3.9.0 |