--- title: "CVE-2009-2473\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-2009-2473?format=md keywords: index, follow --- # CVE-2009-2473 Publication date 21 August 2009 Last updated 17 July 2025 --- Ubuntu priority **Medium** [Why this priority?](https://ubuntu.com/security/cves/about#priority ) Toggle side navigation ## Description neon before 0.28.6, when expat is used, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564. [Read the notes from the security team](https://ubuntu.com/security/CVE-2009-2473?format=md#notes) ## Status Show unmaintained releases | Package | Ubuntu Release | Status | | --- | --- | --- | | neon | 9.04 jaunty | Not in release | | 8.10 intrepid | Not in release | | 8.04 LTS hardy | Not in release | | 6.06 LTS dapper | Not affected | | neon26 | 9.04 jaunty | Not affected | | 8.10 intrepid | Not affected | | 8.04 LTS hardy | Not affected | | 6.06 LTS dapper | Not in release | | neon27 | 9.04 jaunty | Not affected | | 8.10 intrepid | Not affected | | 8.04 LTS hardy | Not affected | | 6.06 LTS dapper | Not in release | --- * [How can I get the fixes?](https://ubuntu.com/security/cves/about#security) * [What do statuses mean?](https://ubuntu.com/security/cves/about#statuses) ## Notes --- ### [jdstrand](https://launchpad.net/~jdstrand) neon, neon26 and neon27 are all build with libxml2 and not expat ## References * [MITRE](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2473) * [NVD](https://nvd.nist.gov/vuln/detail/CVE-2009-2473) * [Launchpad](https://launchpad.net/bugs/cve/CVE-2009-2473) * [Debian](https://security-tracker.debian.org/tracker/CVE-2009-2473) ### Other references *