CVE-2026-48736

HIGH

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

Title source: cna
STIX 2.1

Description

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 (6)

Core 6

Scores

CVSS v3 8.6
EPSS 0.0046
EPSS Percentile 37.6%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-184 CWE-918
Status published
Products (9)
sensiolabs/symfony 5.4.0 - 5.4.43
symfony/http-client >= 5.4.0, < 5.4.53
symfony/http-foundation >= 6.0.0-BETA1, < 6.4.41
symfony/http-foundation >= 7.0.0-BETA1, < 7.4.13
symfony/http-foundation >= 8.0.0-BETA1, < 8.0.13
symfony/symfony >= 5.4.0, < 5.4.53
symfony/symfony >= 6.0.0-BETA1, < 6.4.41
symfony/symfony >= 7.0.0-BETA1, < 7.4.13
symfony/symfony >= 8.0.0-BETA1, < 8.0.13
Published Jul 14, 2026
Tracked Since Jul 15, 2026