{"cve":{"cve_id":"CVE-2023-36807","is_kev":false,"kev_date_added":null,"kev_vendor_project":null,"kev_product":null,"kev_vulnerability_name":null,"kev_short_description":null,"kev_required_action":null,"kev_due_date":null,"kev_known_ransomware":null,"kev_notes":null,"kev_cwes":null,"epss_score":0.00521,"epss_percentile":0.40064,"epss_as_of":"2026-06-23","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. ","published_at":"2023-06-30T18:38:10.303000Z","last_modified_at":null,"cvss_v3_score":6.2,"cvss_v3_vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","cvss_v3_severity":"MEDIUM","cvss_v4_score":null,"cvss_v4_vector":null,"cvss_v4_severity":null,"ssvc_decision":null,"ssvc_exploitation":"poc","ssvc_automatable":false,"ssvc_technical_impact":"partial","cwes":["CWE-835"],"nvd_references":["https://github.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55m","https://github.com/py-pdf/pypdf/issues/1329","https://github.com/py-pdf/pypdf/pull/1331"],"vuln_status":null,"trending_score":null,"is_trending":false,"has_trended":false,"trended_number_one":false,"trending_peak_score":null,"trending_peak_rank":null,"started_trending_at":null,"trended_number_one_at":null,"summary_generated":null,"summary_generated_at":null,"summary_model":null,"created_at":"2026-06-24T00:09:39.878444Z","updated_at":"2026-06-29T01:33:40.240625Z"},"effective_severity":"MEDIUM","badges":[],"impact_analysis":[],"cvss_v3_decoded":{"version":"3.1","metrics":[{"metric":"AV","name":"Attack Vector","value":"L","value_label":"Local"},{"metric":"AC","name":"Attack Complexity","value":"L","value_label":"Low"},{"metric":"PR","name":"Privileges Required","value":"N","value_label":"None"},{"metric":"UI","name":"User Interaction","value":"N","value_label":"None"},{"metric":"S","name":"Scope","value":"U","value_label":"Unchanged"},{"metric":"C","name":"Confidentiality","value":"N","value_label":"None"},{"metric":"I","name":"Integrity","value":"N","value_label":"None"},{"metric":"A","name":"Availability","value":"H","value_label":"High"}]},"cvss_v4_decoded":{"version":null,"metrics":[]},"affected":[{"vendor_slug":"py-pdf","vendor_name":"py-pdf","product_slug":"pypdf","product_name":"pypdf","version_start":"2.10.5","version_start_inclusive":true,"version_end":"2.10.5","version_end_inclusive":true,"cpe23_uri":"cve5:py-pdf:pypdf:2.10.5:2.10.5"}],"exploit_refs":[],"news":[],"references":[{"url":"https://github.com/py-pdf/pypdf/security/advisories/GHSA-hm9v-vj3r-r55m","source_type":"VENDOR_ADVISORY","tags":["advisory"]},{"url":"https://github.com/py-pdf/pypdf/issues/1329","source_type":"MISC","tags":[]},{"url":"https://github.com/py-pdf/pypdf/pull/1331","source_type":"PATCH","tags":["patch"]}],"timeline":[{"type":"published","at":"2023-06-30T18:38:10.303000Z","label":"CVE published","source":null},{"type":"cvss_changed","at":"2026-06-28T17:29:09.228203Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:29:09.228203Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"cvss_changed","at":"2026-06-28T17:29:09.228203Z","label":"CVSS score revised","source":"cvelistv5"},{"type":"ssvc_changed","at":"2026-06-29T01:33:40.240625Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-29T01:33:40.240625Z","label":"SSVC decision revised","source":"vulnrichment"},{"type":"ssvc_changed","at":"2026-06-29T01:33:40.240625Z","label":"SSVC decision revised","source":"vulnrichment"}]}