{"action":"Upgrade squid to 4.11-r0 or later.","affected":[{"fixed":"4.11-r0","introduced":"3.0"}],"component":"squid","cve_ids":[],"ecosystem":"Alpine","ecosystem_qualifier":"Alpine:v3.11","exploited":false,"fixed_versions":["4.11-r0"],"id":"tcs_01M5NB7H1ED02WWGDTVAKZ0XM7","modified_at":"2026-09-21T06:17:52.465321917Z","published_at":"2020-04-15T19:15:12.393Z","references":["https://osv.dev/vulnerability/ALPINE-CVE-2019-12521","https://security.alpinelinux.org/vuln/CVE-2019-12521"],"severity":{"label":"medium","score":5.9},"sources":[{"source":"osv","source_id":"ALPINE-CVE-2019-12521#Alpine:v3.11/squid","url":"https://osv.dev/vulnerability/ALPINE-CVE-2019-12521"}],"summary":"An issue was discovered in Squid through 4.7. When Squid is parsing ESI, it keeps the ESI elements in ESIContext. ESIContext contains a buffer for holding a stack of ESIElements. When a new ESIElement"}