{"id":"CVE-2021-23351","details":"The package github.com/pires/go-proxyproto before 0.5.0 are vulnerable to Denial of Service (DoS) via the parseVersion1() function. The reader in this package is a default bufio.Reader wrapping a net.Conn. It will read from the connection until it finds a newline. Since no limits are implemented in the code, a deliberately malformed V1 header could be used to exhaust memory in a server process using this code - and create a DoS. This can be exploited by sending a stream starting with PROXY and continuing to send data (which does not contain a newline) until the target stops acknowledging. The risk here is small, because only trusted sources should be allowed to send proxy protocol headers.","aliases":["GHSA-fqh4-rh59-xhvf","SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1081577"],"modified":"2026-07-08T06:49:45.606596500Z","published":"2021-03-08T05:15:12.593Z","database_specific":{"unresolved_ranges":[{"extracted_events":[{"introduced":"33"},{"last_affected":"33"},{"introduced":"34"},{"last_affected":"34"}],"source":"CPE_STRING","vendor_product":"fedoraproject:fedora","cpes":["cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*","cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:*"]}]},"references":[{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/4BNVGJMVI3ZTZ675EFPUHPGXCKCGSX46/"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/C36IBVOZXRTWM7MGTRUTOM56P5RR74VU/"},{"type":"ADVISORY","url":"https://github.com/pires/go-proxyproto/issues/69"},{"type":"ADVISORY","url":"https://snyk.io/vuln/SNYK-GOLANG-GITHUBCOMPIRESGOPROXYPROTO-1081577"},{"type":"FIX","url":"https://github.com/pires/go-proxyproto/commit/7f48261db810703d173f27f3309a808cc2b49b8b"},{"type":"FIX","url":"https://github.com/pires/go-proxyproto/pull/71"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/pires/go-proxyproto","events":[{"introduced":"0"},{"fixed":"7f48261db810703d173f27f3309a808cc2b49b8b"}],"database_specific":{"source":["CPE_RANGE","REFERENCES"],"cpe":"cpe:2.3:a:go-proxyproto_project:go-proxyproto:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"0.5.0"}]}}],"versions":["v0.4.2","v0.4.1","v0.4.0","v0.3.3","v0.3.2","v0.3.1","v0.3.0","v0.2.0","v0.1.3","0.1.2","0.1.1","0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-23351.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H"}]}