{"answers":{"affected":"3 open source packages ship an affected version, including nltk. It affects 1 product.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-0847 exists.","fix":"Upgrade nltk to 3.9.3 or later.","what":"CVE-2026-0847 is a high-severity path traversal vulnerability in nltk/nltk, published on 4 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-0847 and fix it if it is affected.\n\nWhat it is: CVE-2026-0847 is a high-severity path traversal vulnerability in nltk/nltk, published on 4 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-0847 exists.\n\nAffected packages and fixed versions:\n- nltk (PyPI): affected all versions up to 3.9.2; no fix listed\n- nltk (PyPI): affected all versions up to 3.9.2; no fix listed\n- nltk (PyPI): affected all versions; fixed in 3.9.3\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-2026-0847/ (Markdown: https://insights.sbomify.com/CVE-2026-0847/index.md)","id":"CVE-2026-0847","markdown":"https://insights.sbomify.com/CVE-2026-0847/index.md","name":"CVE-2026-0847","record":{"aliases":["DEBIAN-CVE-2026-0847","ECHO-e33c-86f9-2eb1","GHSA-68j8-pq59-fqgm","MGASA-2026-0057","PYSEC-2026-98","openSUSE-SU-2026:10304-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read"],"network_reachable":"yes","non_default_config":false,"product_category":"Python NLP library","requires_auth":"none","summary":"Attackers can read arbitrary files on the server via path traversal in NLTK CorpusReader classes, exposing sensitive data like keys and tokens.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"@huntr_ai","cpe":[{"product":"nltk","vendor":"nltk"}],"cvss":{"score":8.6,"severity":"high","source":"cna","vector":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:L/A:L","version":"3.0"},"cwes":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory"}],"description":"A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader. These classes fail to properly sanitize or validate file paths, enabling attackers to traverse directories and access sensitive files on the server. This issue is particularly critical in scenarios where user-controlled file inputs are processed, such as in machine learning APIs, chatbots, or NLP pipelines. Exploitation of this vulnerability can lead to unauthorized access to sensitive files, including system files, SSH private keys, and API tokens, and may potentially escalate to remote code execution when combined with other vulnerabilities.","ecosystems":["PyPI","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":"2026-03-29","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2026-03-29T08:00:18Z","kind":"github_poc","ref":"https://github.com/HyperPS/CVE-2026-0847","stars":0,"title":"A vulnerability in NLTK versions up to and including 3.9.2 allows arbitrary file read via path traversal in multiple CorpusReader classes, including WordListCorpusReader, TaggedCorpusReader, and BracketParseCorpusReader."}],"tier":"weaponised"},"has_fix":true,"headline":"Path Traversal in nltk/nltk","id":"CVE-2026-0847","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":4,"n_references":1,"next":{"headline":"Arbitrary Code Execution in NLTK StanfordSegmenter via Untrusted JAR Loading","id":"CVE-2026-0848"},"packages":[{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["3.9.2"],"package":"nltk","purl":null,"source":"GHSA-68j8-pq59-fqgm"},{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["3.9.2"],"package":"nltk","purl":"pkg:pypi/nltk","source":"GHSA-68j8-pq59-fqgm"},{"ecosystem":"PyPI","fixed":["3.9.3"],"introduced":["0"],"last_affected":[],"package":"nltk","purl":"pkg:pypi/nltk","source":"PYSEC-2026-98"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["3.9.3-1.1"],"introduced":["0"],"last_affected":[],"package":"python-nltk","purl":"pkg:rpm/opensuse/python-nltk\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:10304-1"}],"prev":{"headline":"Arbitrary File Read via Absolute Path Input in nltk.util.filestring()","id":"CVE-2026-0846"},"products":["nltk/nltk"],"published":"2026-03-04","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":"CC BY 4.0","name":"SUSE","prefix":"openSUSE"},{"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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-09-16","vendors":["nltk"]},"summary":"Attackers can read arbitrary files on the server via path traversal in NLTK CorpusReader classes, exposing sensitive data like keys and tokens.","url":"https://insights.sbomify.com/CVE-2026-0847/"}