{"answers":{"affected":"3 open source packages ship an affected version, including nltk. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-71513 in the wild and no public exploit code.","fix":"Upgrade nltk to 3.10.3 or later.","what":"CVE-2026-71513 is a high-severity unsafe deserialization vulnerability in nltk, published on 22 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-71513 and fix it if it is affected.\n\nWhat it is: CVE-2026-71513 is a high-severity unsafe deserialization vulnerability in nltk, published on 22 Aug 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-71513 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- nltk (PyPI): affected from 3.10.0; fixed in 3.10.3\n- nltk (PyPI): affected from 3.10.0; fixed in 3.10.3\n- nltk (PyPI): affected from 3.10.0; fixed in 3.10.3\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-2026-71513/ (Markdown: https://insights.sbomify.com/CVE-2026-71513/index.md)","id":"CVE-2026-71513","markdown":"https://insights.sbomify.com/CVE-2026-71513/index.md","name":"CVE-2026-71513","record":{"aliases":["DEBIAN-CVE-2026-71513","GHSA-5gh2-94qg-qppq","PYSEC-2026-3867","UBUNTU-CVE-2026-71513"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Python NLP library","requires_auth":"none","summary":"Attackers can execute arbitrary code by crafting malicious transition-parser models that bypass allowlist checks in NLTK's unpickler.","user_interaction":"required","vuln_class":"deserialization"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[{"product":"nltk","vendor":"nltk"}],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-502","name":"Deserialization of Untrusted Data"}],"description":"NLTK before 3.10.3 contains a remote code execution vulnerability in AllowlistUnpickler that validates only the pickle module string and not the global name, allowing attackers to resolve dotted names by attribute traversal to callables outside the allowlisted namespace. Attackers can craft untrusted transition-parser models that execute arbitrary commands when TransitionParser.parse loads the model through allowlisted_pickle_load.","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":"NLTK 3.10.0 through 3.10.2 Remote Code Execution via AllowlistUnpickler Dotted-Name Bypass","id":"CVE-2026-71513","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"deserialization","year":"2026"},"n_packages":3,"n_references":4,"next":{"headline":"NLTK 3.9.4 through 3.10.2 Path Traversal via CrubadanCorpusReader pathsec Bypass","id":"CVE-2026-71514"},"packages":[{"ecosystem":"PyPI","fixed":["3.10.3"],"introduced":["3.10.0"],"last_affected":[],"package":"nltk","purl":null,"source":"GHSA-5gh2-94qg-qppq"},{"ecosystem":"PyPI","fixed":["3.10.3"],"introduced":["3.10.0"],"last_affected":[],"package":"nltk","purl":"pkg:pypi/nltk","source":"GHSA-5gh2-94qg-qppq"},{"ecosystem":"PyPI","fixed":["3.10.3"],"introduced":["3.10.0"],"last_affected":[],"package":"nltk","purl":"pkg:pypi/nltk","source":"PYSEC-2026-3867"}],"prev":{"headline":"Dolibarr \u003c 24.0.0 Members REST API Sensitive Data Exposure via Member Endpoints","id":"CVE-2026-71511"},"products":["nltk"],"published":"2026-08-22","related":[{"cvss_score":10,"headline":"Arbitrary Code Execution in NLTK StanfordSegmenter via Untrusted JAR Loading","id":"CVE-2026-0848","kev_date_added":null,"published":"2026-03-05"},{"cvss_score":10,"headline":"Zip Slip Vulnerability in nltk/nltk Leading to Remote Code Execution","id":"CVE-2025-14009","kev_date_added":null,"published":"2026-02-18"},{"cvss_score":9.4,"headline":"NLTK before 3.10.0 Remote Code Execution via Unsafe Pickle Deserialization","id":"CVE-2026-78683","kev_date_added":null,"published":"2026-08-25"},{"cvss_score":9.3,"headline":"NLTK before 3.10.3 Remote Code Execution via Unsafe Pickle Deserialization","id":"CVE-2026-79657","kev_date_added":null,"published":"2026-08-25"},{"cvss_score":9.3,"headline":"NLTK before 3.10.3 JVM Argument Injection via Per-Call Options","id":"CVE-2026-79675","kev_date_added":null,"published":"2026-08-25"},{"cvss_score":8.8,"headline":"NLTK 3.10.2 Path Traversal via corpus-reader constructors","id":"CVE-2026-79674","kev_date_added":null,"published":"2026-08-25"},{"cvss_score":8.7,"headline":"nltk PorterStemmer before 3.10.3 Quadratic-time DoS","id":"CVE-2026-81722","kev_date_added":null,"published":"2026-08-27"}],"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":"total"},"state":"PUBLISHED","updated":"2026-08-27","vendors":["nltk"]},"summary":"Attackers can execute arbitrary code by crafting malicious transition-parser models that bypass allowlist checks in NLTK's unpickler.","url":"https://insights.sbomify.com/CVE-2026-71513/"}