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Incomplete List of Disallowed Inputs

CVE-2026-48736

Medium
6.9/10

Summary

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. In versions 5.4.x prior to 5.4.53, 6.4.x prior to 6.4.41, 7.x prior to 7.4.13 and 8.x prior to 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.

  • LOW
  • NETWORK
  • NONE
  • CHANGED
  • NONE
  • NONE
  • HIGH
  • NONE

CWE-184 - Incomplete List of Disallowed Inputs

The product implements a protection mechanism that relies on a list of inputs (or properties of inputs) that are not allowed by policy or otherwise require other action to neutralize before additional processing takes place, but the list is incomplete, leading to resultant weaknesses.

References

Advisory Timeline

  • Published