{"id":"AZL-26869","summary":"CVE-2023-31147 affecting package c-ares for versions less than 1.19.1-1","details":"c-ares is an asynchronous resolver library. When /dev/urandom or RtlGenRandom() are unavailable, c-ares uses rand() to generate random numbers used for DNS query ids. This is not a CSPRNG, and it is also not seeded by srand() so will generate predictable output. Input from the random number generator is fed into a non-compilant RC4 implementation and may not be as strong as the original RC4 implementation. No attempt is made to look for modern OS-provided CSPRNGs like arc4random() that is widely available. This issue has been fixed in version 1.19.1.","modified":"2026-04-01T05:08:32.355462Z","published":"2023-05-25T22:15:09Z","upstream":["CVE-2023-31147"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-31147"}],"affected":[{"package":{"name":"c-ares","ecosystem":"Azure Linux:2","purl":"pkg:rpm/azure-linux/c-ares"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.19.1-1"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-26869.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N"}]}