CVE-2026-48736
Symfony: IpUtils::PRIVATE_SUBNETS Omits IPv6 Transition Forms (6to4, NAT64, Teredo, IPv4-compatible): SSRF Bypass in NoPrivateNetworkHttpClient
CVSS Score
0.0
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-184 CWE-918 |
| Vendor | symfony |
| Product | symfony |
| Published | Jul 14, 2026 |
| Last Updated | Jul 15, 2026 |
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Affected Versions
symfony / symfony
>= 5.4.0, < 5.4.53 >= 6.0.0-BETA1, < 6.4.41 >= 7.0.0-BETA1, < 7.4.13 >= 8.0.0-BETA1, < 8.0.13
symfony / http-client
>= 5.4.0, < 5.4.53
symfony / http-foundation
>= 6.0.0-BETA1, < 6.4.41 >= 7.0.0-BETA1, < 7.4.13 >= 8.0.0-BETA1, < 8.0.13
References
github.com: https://github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755 github.com: https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2 github.com: https://github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65e github.com: https://github.com/symfony/symfony/releases/tag/v5.4.53 github.com: https://github.com/symfony/symfony/releases/tag/v6.4.41 github.com: https://github.com/symfony/symfony/releases/tag/v7.4.13