Vulnerabilities
Vulnerable Software

Vulnerability Details CVE-2026-48736

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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.005
EPSS Ranking 37.0%
CVSS Severity
CVSS v3 Score 8.6
Products affected by CVE-2026-48736


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