{"id":"CVE-2026-48736","aliases":["GHSA-38cx-cq6f-5755"],"url":"https://o3.security/vulnerability/CVE-2026-48736","summary":"Symfony: IpUtils::PRIVATE_SUBNETS Omits IPv6 Transition Forms (6to4, NAT64, Teredo, IPv4-compatible): SSRF Bypass in NoPrivateNetworkHttpClient","details":"Symfony is a PHP framework for web and console applications and a set of reusable PHP components. From 5.4.0 to 5.4.53, 6.4.41, 7.4.13, and 8.0.13, NoPrivateNetworkHttpClient and IpUtils::PRIVATE_SUBNETS omitted IPv6 transition prefixes such as 6to4, NAT64, Teredo, and IPv4-compatible IPv6, allowing attacker-supplied URLs to represent private IPv4 targets in forms that IpUtils::isPrivateIp() did not block. This issue is fixed in versions 5.4.53, 6.4.41, 7.4.13, and 8.0.13.","published":"2026-07-14T19:09:30.260Z","modified":"2026-08-12T03:51:22.070798902Z","cvss":null,"epss":{"score":0.0057,"percentile":0.44595,"asOf":"2026-08-24"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Packagist","name":"symfony/http-client","fixedVersion":"5.4.53"},{"ecosystem":"Packagist","name":"symfony/http-foundation","fixedVersion":"6.4.41"},{"ecosystem":"Packagist","name":"symfony/http-foundation","fixedVersion":"7.4.13"},{"ecosystem":"Packagist","name":"symfony/http-foundation","fixedVersion":"8.0.13"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"5.4.53"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"6.4.41"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"7.4.13"},{"ecosystem":"Packagist","name":"symfony/symfony","fixedVersion":"8.0.13"}],"fix":{"url":"https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2","label":"symfony/symfony@8276536"},"references":[{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v5.4.53"},{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v6.4.41"},{"type":"WEB","url":"https://github.com/symfony/symfony/releases/tag/v7.4.13"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/48xxx/CVE-2026-48736.json"},{"type":"ADVISORY","url":"https://github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-48736"},{"type":"FIX","url":"https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2"},{"type":"FIX","url":"https://github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65e"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:22.070798902Z"}}