CVE-2023-36807
In version 2.10.5 an attacker who uses this vulnerability can craft a PDF which leads to an infinite loop.
Does this matter?
Lower severity and a low EPSS score (0.57%). Track it; it rarely justifies an emergency change on its own.
Description
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.
- CVSS 3.1
- 6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- EPSS
- 0.57% probability · 46th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-835
- Affected
- pypdf project/pypdf
- Source
- security-advisories@github.com
References
- https://github.com/py-pdf/pypdf/issues/1329Exploit, Issue Tracking, Vendor Advisory
- https://github.com/py-pdf/pypdf/pull/1331Patch
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55mExploit, Mitigation, Patch, Vendor Advisory
- https://github.com/py-pdf/pypdf/issues/1329Exploit, Issue Tracking, Vendor Advisory
- https://github.com/py-pdf/pypdf/pull/1331Patch
- https://github.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55mExploit, Mitigation, Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.