CVE-2026-48736

MEDIUM6.9

Symfony: IpUtils::PRIVATE_SUBNETS Omits IPv6 Transition Forms (6to4, NAT64, Teredo, IPv4-compatible): SSRF Bypass in NoPrivateNetworkHttpClient

Published Jul 14, 2026

Modified Yesterday

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.

References

WEB

https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2

WEB

https://github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65e

WEB

https://github.com/symfony/symfony/releases/tag/v5.4.53

WEB

https://github.com/symfony/symfony/releases/tag/v6.4.41

WEB

https://github.com/symfony/symfony/releases/tag/v7.4.13

WEB