{"answers":{"affected":"3 open source packages ship an affected version, including pypdf2 and PyPDF2. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-36807 exists.","fix":"Upgrade pypdf2 to 2.10.6 or later.","what":"CVE-2023-36807 is a medium-severity denial of service vulnerability in Pypdf Project Pypdf, published on 30 Jun 2023. It can only be exploited from the same machine or local network, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2023-36807 and fix it if it is affected.\n\nWhat it is: CVE-2023-36807 is a medium-severity denial of service vulnerability in Pypdf Project Pypdf, published on 30 Jun 2023. It can only be exploited from the same machine or local network, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-36807 exists.\n\nAffected packages and fixed versions:\n- pypdf2 (PyPI): affected from 2.10.5; fixed in 2.10.6\n- pypdf2 (PyPI): affected from 2.10.5; fixed in 2.10.6\n- PyPDF2 (PyPI): affected from 2.10.5; fixed in 2.10.6\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2023-36807/ (Markdown: https://insights.sbomify.com/CVE-2023-36807/index.md)","id":"CVE-2023-36807","markdown":"https://insights.sbomify.com/CVE-2023-36807/index.md","name":"CVE-2023-36807","record":{"aliases":["DEBIAN-CVE-2023-36807","GHSA-hm9v-vj3r-r55m","PYSEC-2026-1836"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"adjacent_or_local","non_default_config":false,"product_category":"Python PDF library","requires_auth":"none","summary":"An attacker can cause a denial of service via infinite loop by crafting a malformed PDF processed by the pypdf library.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"pypdf","vendor":"pypdf_project"}],"cvss":{"score":6.2,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-835","name":"Loop with Unreachable Exit Condition"}],"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.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"Infinite Loop when reading malformed objects in pypdf","id":"CVE-2023-36807","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":"pypdf_project:pypdf","products":["pypdf_project:pypdf"],"type":"denial_of_service","year":"2023"},"n_packages":3,"n_references":3,"next":{"headline":"GLPI vulnerable to SQL injection through Computer Virtual Machine information","id":"CVE-2023-36808"},"packages":[{"ecosystem":"PyPI","fixed":["2.10.6"],"introduced":["2.10.5"],"last_affected":[],"package":"PyPDF2","purl":null,"source":"GHSA-hm9v-vj3r-r55m"},{"ecosystem":"PyPI","fixed":["2.10.6"],"introduced":["2.10.5"],"last_affected":[],"package":"pypdf2","purl":"pkg:pypi/pypdf2","source":"GHSA-hm9v-vj3r-r55m"},{"ecosystem":"PyPI","fixed":["2.10.6"],"introduced":["2.10.5"],"last_affected":[],"package":"pypdf2","purl":"pkg:pypi/pypdf2","source":"PYSEC-2026-1836"}],"prev":{"headline":"Contao cross site scripting vulnerability via input unit widget","id":"CVE-2023-36806"},"products":["pypdf"],"published":"2023-06-30","related":[{"cvss_score":8.7,"headline":"pypdf: Possible large memory usage when retrieving Roman page labels","id":"CVE-2026-102993","kev_date_added":null,"published":"2026-09-30"},{"cvss_score":8.7,"headline":"pypdf: Possible long runtimes/large memory usage when parsing indirect objects","id":"CVE-2026-102994","kev_date_added":null,"published":"2026-09-30"},{"cvss_score":8.7,"headline":"pypdf: Possible large memory usage for large /ToUnicode streams (Follow-up 2)","id":"CVE-2026-102995","kev_date_added":null,"published":"2026-09-30"},{"cvss_score":8.7,"headline":"pypdf: Possible large memory usage when parsing font data","id":"CVE-2026-102996","kev_date_added":null,"published":"2026-09-30"},{"cvss_score":8.7,"headline":"pypdf: Possible long runtimes for partially malformed FlateDecode streams (Follow-up)","id":"CVE-2026-102997","kev_date_added":null,"published":"2026-09-30"},{"cvss_score":8.7,"headline":"pypdf: Possible long runtimes when generating appearance streams","id":"CVE-2026-102998","kev_date_added":null,"published":"2026-09-30"},{"cvss_score":8.7,"headline":"pypdf: Possible long runtimes with large amount of embedded files","id":"CVE-2026-102999","kev_date_added":null,"published":"2026-09-30"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2024-11-06","vendors":["py-pdf"]},"summary":"An attacker can cause a denial of service via infinite loop by crafting a malformed PDF processed by the pypdf library.","url":"https://insights.sbomify.com/CVE-2023-36807/"}