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bdu:2023-07661

EUVD-2026-199799

fkie_cve-2023-36807

pypdf is a pure-python PDF library capable of splitting, merging, cropping, and transforming the pages of PDF files. In version 2.10.5 an attacker who uses this vulnerability 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 if the user extracted metadata from such a malformed PDF. Versions prior to 2.10.5 throw an error, but do not hang forever. This issue was fixed with https://github.com/py-pdf/pypdf/pull/1331 which has been included in release 2.10.6. Users are advised to upgrade. Users unable to upgrade should modify `PyPDF2/generic/_data_structures.py::read_object` to an an error throwing case. See GHSA-hm9v-vj3r-r55m for details.

GHSA-hm9v-vj3r-r55m — PyPDF2 vulnerable to possible Infinite Loop when reading malformed objects

Affected: PyPI: PyPDF2

### Impact An attacker who uses this vulnerability 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 if the user extracted metadata from such a malformed PDF.

### Patches The issue was fixed with https://github.com/py-pdf/pypdf/pull/1331

### Workarounds If you cannot update your version of `PyPDF2` (preferably to `pypdf>3.1.0` as PyPDF2 is deprecated), you should modify `PyPDF2/generic/_data_structures.py::read_object`.

Replace:

```python else: # number object OR indirect reference peek = stream.read(20) stream.seek(-len(peek), 1) # reset to start if IndirectPattern.match(peek) is not None: return IndirectObject.read_from_stream(stream, pdf) else: return NumberObject.read_from_stream(stream) ```

```python elif tok in b"0123456789+-.": # number object OR indirect reference peek = stream.read(20) stream.seek(-len(peek), 1) # reset to start if IndirectPattern.match(peek) is not None: return IndirectObject.read_from_stream(stream, pdf) else: return NumberObject.read_from_stream(stream) else: raise PdfReadError( f"Invalid Elementary Object starting with {tok} @{stream.tell()}" ) ```

### References * [pypdf issue #1329](https://github.com/py-pdf/py…

gsd-2023-36807

PYSEC-2026-1836 — PyPDF2 vulnerable to possible Infinite Loop when reading malformed objects

Affected: PyPI: pypdf2

### Patches The issue was fixed with https://github.com/py-pdf/pypdf/pull/1331

### Workarounds If you cannot update your version of `PyPDF2` (preferably to `pypdf>3.1.0` as PyPDF2 is deprecated), you should modify `PyPDF2/generic/_data_structures.py::read_object`.

Replace:

### References * [pypdf issue #1329](https://github.com/py-pdf/py…

Withdrawn: UBUNTU-CVE-2023-36807

Withdrawn by the publisher.

Affected: Ubuntu:16.04:LTS: pypdf2, Ubuntu:Pro:16.04:LTS: pypdf2, Ubuntu:18.04:LTS: pypdf2, Ubuntu:Pro:18.04:LTS: pypdf2, Ubuntu:20.04:LTS: pypdf2, Ubuntu:22.04:LTS: pypdf2