{"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-2026-81726 exists.","fix":"Upgrade nltk to 3.10.3 or later.","what":"CVE-2026-81726 is a high-severity path traversal vulnerability in nltk, published on 27 Aug 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-2026-81726 and fix it if it is affected.\n\nWhat it is: CVE-2026-81726 is a high-severity path traversal vulnerability in nltk, published on 27 Aug 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-2026-81726 exists.\n\nAffected packages and fixed versions:\n- nltk (PyPI): affected all versions up to 3.10.3; no fix listed\n- nltk (PyPI): affected all versions up to 3.10.3; no fix listed\n- nltk (PyPI): affected all versions; 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-2026-81726/ (Markdown: https://insights.sbomify.com/CVE-2026-81726/index.md)","id":"CVE-2026-81726","markdown":"https://insights.sbomify.com/CVE-2026-81726/index.md","name":"CVE-2026-81726","record":{"aliases":["DEBIAN-CVE-2026-81726","GHSA-8mgp-746c-j5xp","PYSEC-2026-3740","UBUNTU-CVE-2026-81726","openSUSE-SU-2026:12280-1"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["data_read","data_modify"],"network_reachable":"yes","non_default_config":true,"product_category":"Python NLP library","requires_auth":"none","summary":"Attackers can read or write files outside sandbox roots via model-artifact APIs in NLTK when pathsec is enabled.","user_interaction":"not_required","vuln_class":"path_traversal"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[{"product":"nltk","vendor":"nltk"}],"cvss":{"score":8.3,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:L/VA:L/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-73","name":"External Control of File Name or Path"}],"description":"NLTK through 3.10.3 contains a path traversal vulnerability in model-artifact APIs that bypass pathsec enforcement by using raw file operations on caller-controlled paths. Attackers can read or write files outside allowed sandbox roots through TransitionParser, AveragedPerceptron, PerceptronTagger, and maxent parameter APIs when pathsec is enabled.","ecosystems":["PyPI","openSUSE:Tumbleweed"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"NLTK through 3.10.3 Path Traversal via Model-Artifact APIs","id":"CVE-2026-81726","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"path_traversal","year":"2026"},"n_packages":4,"n_references":2,"next":{"headline":"NLTK before 3.10.3 Hardlink File Overwrite via downloader","id":"CVE-2026-81727"},"packages":[{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["3.10.3"],"package":"nltk","purl":null,"source":"GHSA-8mgp-746c-j5xp"},{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["3.10.3"],"package":"nltk","purl":"pkg:pypi/nltk","source":"GHSA-8mgp-746c-j5xp"},{"ecosystem":"PyPI","fixed":["3.10.3"],"introduced":["0"],"last_affected":[],"package":"nltk","purl":"pkg:pypi/nltk","source":"PYSEC-2026-3740"},{"ecosystem":"openSUSE:Tumbleweed","fixed":["3.10.4-1.1"],"introduced":["0"],"last_affected":[],"package":"python-nltk","purl":"pkg:rpm/opensuse/python-nltk\u0026distro=openSUSE%20Tumbleweed","source":"openSUSE-SU-2026:12280-1"}],"prev":{"headline":"NLTK before 3.10.3 Regular Expression Denial of Service via Pl196xCorpusReader","id":"CVE-2026-81725"},"products":["nltk"],"published":"2026-08-27","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)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-27","vendors":["nltk"]},"summary":"Attackers can read or write files outside sandbox roots via model-artifact APIs in NLTK when pathsec is enabled.","url":"https://insights.sbomify.com/CVE-2026-81726/"}