CVE-2026-48736
Published:July 14, 2026
Updated:July 21, 2026
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.
Affected Packages
https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v6.4.0-BETA1 <v6.4.41Fix Suggestion:
Update to version v6.4.41https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v8.0.0-BETA1 <v8.0.13Fix Suggestion:
Update to version v8.0.13https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v5.4.0-BETA1 <v5.4.53Fix Suggestion:
Update to version v5.4.53https://github.com/symfony/symfony.git (GITHUB):
Affected version(s) >=v7.0.0-BETA1 <v7.4.13Fix Suggestion:
Update to version v7.4.13symfony/symfony (PHP):
Affected version(s) >=v7.0.0 <v7.4.13Fix Suggestion:
Update to version v7.4.13symfony/http-foundation (PHP):
Affected version(s) >=v8.0.0 <v8.0.13Fix Suggestion:
Update to version v8.0.13symfony/http-foundation (PHP):
Affected version(s) >=v7.0.0 <v7.4.13Fix Suggestion:
Update to version v7.4.13symfony/http-foundation (PHP):
Affected version(s) >=v7.0.0 <v7.4.13Fix Suggestion:
Update to version v7.4.13symfony/http-foundation (PHP):
Affected version(s) >=v8.0.0 <v8.0.13Fix Suggestion:
Update to version v8.0.13symfony/symfony (PHP):
Affected version(s) >=v6.4.0 <v6.4.41Fix Suggestion:
Update to version v6.4.41symfony/symfony (PHP):
Affected version(s) >=v5.4.0 <v5.4.53Fix Suggestion:
Update to version v5.4.53symfony/http-client (PHP):
Affected version(s) >=v5.4.0 <v5.4.53Fix Suggestion:
Update to version v5.4.53symfony/http-foundation (PHP):
Affected version(s) >=v6.4.0 <v6.4.41Fix Suggestion:
Update to version v6.4.41symfony/http-client (PHP):
Affected version(s) >=v5.4.0 <v5.4.53Fix Suggestion:
Update to version v5.4.53symfony/symfony (PHP):
Affected version(s) >=v8.0.0 <v8.0.13Fix Suggestion:
Update to version v8.0.13symfony/http-foundation (PHP):
Affected version(s) >=v6.4.0 <v6.4.41Fix Suggestion:
Update to version v6.4.41Related Resources (11)
Do you need more information?
Contact UsCVSS v4
Base Score:
6.9
Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
NONE
User Interaction
NONE
Vulnerable System Confidentiality
NONE
Vulnerable System Integrity
NONE
Vulnerable System Availability
NONE
Subsequent System Confidentiality
HIGH
Subsequent System Integrity
LOW
Subsequent System Availability
NONE
CVSS v3
Base Score:
9.3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
LOW
Availability
NONE
Weakness Type (CWE)
EPSS
Base Score:
0.46