{"answers":{"affected":"6 open source packages ship an affected version, including pypdf, PyPDF2 and pypdf2. It affects 2 products.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2023-36464 exists.","fix":"Upgrade pypdf to 3.9.0 or later.","what":"CVE-2023-36464 is a medium-severity denial of service vulnerability in Pypdf Project Pypdf, published on 27 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-2023-36464 and fix it if it is affected.\n\nWhat it is: CVE-2023-36464 is a medium-severity denial of service vulnerability in Pypdf Project Pypdf, published on 27 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-2023-36464 exists.\n\nAffected packages and fixed versions:\n- pypdf (PyPI): affected from 3.1.0; fixed in 3.9.0\n- pypdf (PyPI): affected from 3.1.0; fixed in 3.9.0\n- pypdf (PyPI): affected from 3.1.0; fixed in 3.9.0\n- PyPDF2 (PyPI): affected from 2.2.0 up to 3.0.1; no fix listed\n- pypdf2 (PyPI): affected from 2.2.0 up to 3.0.1; no fix listed\n- pypdf2 (PyPI): affected from 2.2.0; fixed in 3.9.0\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-2023-36464/ (Markdown: https://insights.sbomify.com/CVE-2023-36464/index.md)","id":"CVE-2023-36464","markdown":"https://insights.sbomify.com/CVE-2023-36464/index.md","name":"CVE-2023-36464","record":{"aliases":["DEBIAN-CVE-2023-36464","GHSA-4vvm-4w3v-6mr8","PYSEC-2026-1835","PYSEC-2026-3008","RHLW-2026-821eaab8409c2a61","ROOT-APP-PYPI-CVE-2023-36464","UBUNTU-CVE-2023-36464"],"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 in pypdf by crafting a specific PDF file that triggers the vulnerability during text extraction.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"pypdf2","vendor":"pypdf2_project"},{"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 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\"\")`.","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 a comment isn't followed by a character in pypdf","id":"CVE-2023-36464","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":6,"n_references":3,"next":{"headline":"Decidim has broken access control in templates","id":"CVE-2023-36465"},"packages":[{"ecosystem":"PyPI","fixed":[],"introduced":["2.2.0"],"last_affected":["3.0.1"],"package":"PyPDF2","purl":null,"source":"GHSA-4vvm-4w3v-6mr8"},{"ecosystem":"PyPI","fixed":["3.9.0"],"introduced":["3.1.0"],"last_affected":[],"package":"pypdf","purl":null,"source":"GHSA-4vvm-4w3v-6mr8"},{"ecosystem":"PyPI","fixed":["3.9.0"],"introduced":["3.1.0"],"last_affected":[],"package":"pypdf","purl":"pkg:pypi/pypdf","source":"GHSA-4vvm-4w3v-6mr8"},{"ecosystem":"PyPI","fixed":["3.9.0"],"introduced":["3.1.0"],"last_affected":[],"package":"pypdf","purl":"pkg:pypi/pypdf","source":"PYSEC-2026-3008"},{"ecosystem":"PyPI","fixed":[],"introduced":["2.2.0"],"last_affected":["3.0.1"],"package":"pypdf2","purl":"pkg:pypi/pypdf2","source":"GHSA-4vvm-4w3v-6mr8"},{"ecosystem":"PyPI","fixed":["3.9.0"],"introduced":["2.2.0"],"last_affected":[],"package":"pypdf2","purl":"pkg:pypi/pypdf2","source":"PYSEC-2026-1835"}],"prev":{"headline":"Cross site scripting (XSS) in meldekarten generator","id":"CVE-2023-36463"},"products":["pypdf"],"published":"2023-06-27","related":[],"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":"2024-12-03","vendors":["py-pdf"]},"summary":"An attacker can cause a denial of service via infinite loop in pypdf by crafting a specific PDF file that triggers the vulnerability during text extraction.","url":"https://insights.sbomify.com/CVE-2023-36464/"}