{"cve":"CVE-2026-78680","nvd":{"published":"2026-08-25T02:16:52.607","modified":"2026-10-12T21:10:00.227","status":"Awaiting Analysis","description":"NLTK versions before 3.10.3 fail to use validated absolute paths when invoking the Graphviz dot binary in dependencygraph.dot2img and AlignedSent._repr_svg_, allowing attackers to execute arbitrary code by placing a malicious dot binary in the search path or current working directory. Attackers can exploit bare-name binary resolution on Windows via the current working directory or on Unix-like systems via relative PATH entries to execute their binary instead of the legitimate Graphviz tool.","cvss_v4":{"vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.5},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-426"],"references":["https://github.com/nltk/nltk/security/advisories/GHSA-6hwm-xvph-95vm","https://www.vulncheck.com/advisories/nltk-before-arbitrary-code-execution-via-graphviz-dot-binary","https://github.com/nltk/nltk/security/advisories/GHSA-6hwm-xvph-95vm"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:50:17.453294893+00:00"},"epss":{"cve":"CVE-2026-78680","score":0.00177,"percentile":0.07188,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-6hwm-xvph-95vm","url":"https://osv.dev/vulnerability/GHSA-6hwm-xvph-95vm","summary":"NLTK: Uncontrolled search path when invoking the Graphviz 'dot' binary","modified":"2026-09-10T12:25:25.368160026Z","packages":[{"ecosystem":"PyPI","name":"nltk","purl":"pkg:pypi/nltk","ranges":["<3.10.3"],"fixed":["3.10.3"]}]},{"id":"PYSEC-2026-3868","url":"https://osv.dev/vulnerability/PYSEC-2026-3868","summary":"NLTK: Uncontrolled search path when invoking the Graphviz 'dot' binary","modified":"2026-09-10T12:15:07.211785746Z","packages":[{"ecosystem":"PyPI","name":"nltk","purl":"pkg:pypi/nltk","ranges":["<3.10.3"],"fixed":["3.10.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}