--- title: "CVE-2026-78680\n | Ubuntu" description: Ubuntu is an open source software operating system that runs from the desktop, to the cloud, to all your internet connected things. url: https://ubuntu.com/security/CVE-2026-78680?format=md keywords: index, follow --- # CVE-2026-78680 Publication date 25 August 2026 Last updated 26 August 2026 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) Toggle side navigation ## 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. ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-78680) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2026-78680) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2026-78680) * [Debian](https://security-tracker.debian.org/tracker/CVE-2026-78680) ### Other references * * * *