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c-ares is a C library for asynchronous DNS requests. `ares__read_line()` is used to parse local configuration files such as `/etc/resolv.conf`, `/etc/nsswitch.conf`, the `HOSTALIASES` file, and if using a c-ares version prior to 1.27.0, the `/etc/hosts` file. If any of these configuration files has an embedded `NULL` character as the first character in a new line, it can lead to attempting to read memory prior to the start of the given buffer which may result in a crash. This issue is fixed in c-ares 1.27.0. No known workarounds exist. References: https://nvd.nist.gov/vuln/detail/CVE-2024-25629 https://github.com/c-ares/c-ares/security/advisories/GHSA-mg26-v6qh-x48q https://security-tracker.debian.org/tracker/CVE-2024-25629 Signed-off-by: Yogita Urade <yogita.urade@windriver.com> Signed-off-by: Armin Kuster <akuster808@gmail.com>