{"action":"Upgrade symfony/symfony to 5.4.53 or later.","affected":[{"fixed":"5.4.53","introduced":"5.4.0"},{"fixed":"6.4.41","introduced":"6.4.0"},{"fixed":"7.4.13","introduced":"7.0.0"},{"fixed":"8.0.13","introduced":"8.0.0"}],"component":"symfony/symfony","cve_ids":["CVE-2026-48736"],"ecosystem":"Packagist","epss":0.0057,"exploited":false,"fixed_versions":["5.4.53","6.4.41","7.4.13","8.0.13"],"ghsa_id":"GHSA-38cx-cq6f-5755","id":"tcs_01M5KESSC2R1BWXH29P2FWETGJ","modified_at":"2026-09-10T03:51:07.914923830Z","published_at":"2026-06-15T17:31:28Z","references":["https://osv.dev/vulnerability/GHSA-38cx-cq6f-5755","https://github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755","https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2","https://github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65e","https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-client/CVE-2026-48736.yaml","https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2026-48736.yaml","https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-48736.yaml","https://github.com/symfony/symfony","https://symfony.com/cve-2026-48736"],"severity":{"label":"medium"},"sources":[{"source":"osv","source_id":"GHSA-38cx-cq6f-5755#Packagist/symfony/symfony","url":"https://osv.dev/vulnerability/GHSA-38cx-cq6f-5755"}],"summary":"Symfony: IpUtils::PRIVATE_SUBNETS Omits IPv6 Transition Forms (6to4, NAT64, Teredo, IPv4-compatible): SSRF Bypass in NoPrivateNetworkHttpClient"}