{"answers":{"affected":"3 open source packages ship an affected version, including pypdf. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-84311 in the wild and no public exploit code.","fix":"Upgrade pypdf to 6.16.1 or later.","what":"CVE-2026-84311 is a medium-severity denial of service vulnerability in Pypdf Project Pypdf, published on 1 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-84311 and fix it if it is affected.\n\nWhat it is: CVE-2026-84311 is a medium-severity denial of service vulnerability in Pypdf Project Pypdf, published on 1 Sep 2026. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-84311 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- pypdf (PyPI): affected all versions; fixed in 6.16.1\n- pypdf (PyPI): affected all versions; fixed in 6.16.1\n- pypdf (PyPI): affected all versions; fixed in 6.16.1\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-2026-84311/ (Markdown: https://insights.sbomify.com/CVE-2026-84311/index.md)","id":"CVE-2026-84311","markdown":"https://insights.sbomify.com/CVE-2026-84311/index.md","name":"CVE-2026-84311","record":{"aliases":["DEBIAN-CVE-2026-84311","ECHO-7b2c-9b22-8657","GHSA-763m-79hh-57f2","MINI-7f8w-qc4x-h7mc","MINI-8v44-p828-ph7h","MINI-cg65-v279-w6c9","MINI-cjch-wj7f-7mv5","MINI-h28v-pgjh-p575","MINI-h9pj-6r5f-44c3","MINI-hh3x-4mwj-2rwj","MINI-m9cf-655h-99xg","MINI-mg53-8j42-hrw9","MINI-mxgq-3f49-jcgj","MINI-wp29-2jmw-4cmg","PYSEC-2026-3911","UBUNTU-CVE-2026-84311"],"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 denial of service via long runtimes and high memory usage by crafting a PDF with reused form XObjects in pypdf.","user_interaction":"required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"pypdf","vendor":"pypdf_project"}],"cvss":{"score":4.8,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-834","name":"Excessive Iteration"}],"description":"pypdf is a free and open-source pure-python PDF library. Prior to 6.16.1, an attacker can craft a PDF that causes pypdf/_page.py PageObject._extract_text and PageObject.extract_xform_text to traverse a directed acyclic graph of reused form XObjects in which each form invokes a child multiple times, creating exponentially many traversal paths and causing long runtimes and large memory consumption. This issue is fixed in version 6.16.1.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"pypdf: Possible long runtimes/large memory usage when extracting XForm objects","id":"CVE-2026-84311","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":"pypdf_project:pypdf","products":["pypdf_project:pypdf"],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":4,"next":{"headline":"Nginx UI: Casdoor SSO callback uses a constant `state` parameter (login CSRF)","id":"CVE-2026-84312"},"packages":[{"ecosystem":"PyPI","fixed":["6.16.1"],"introduced":["0"],"last_affected":[],"package":"pypdf","purl":null,"source":"GHSA-763m-79hh-57f2"},{"ecosystem":"PyPI","fixed":["6.16.1"],"introduced":["0"],"last_affected":[],"package":"pypdf","purl":"pkg:pypi/pypdf","source":"GHSA-763m-79hh-57f2"},{"ecosystem":"PyPI","fixed":["6.16.1"],"introduced":["0"],"last_affected":[],"package":"pypdf","purl":"pkg:pypi/pypdf","source":"PYSEC-2026-3911"}],"prev":{"headline":"pypdf: Possible long runtimes/large memory usage when retrieving outlines","id":"CVE-2026-84310"},"products":["pypdf"],"published":"2026-09-01","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":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-02","vendors":["py-pdf"]},"summary":"An attacker can cause denial of service via long runtimes and high memory usage by crafting a PDF with reused form XObjects in pypdf.","url":"https://insights.sbomify.com/CVE-2026-84311/"}