Riskcovery

CVE-2026-48736

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

State
Published
Severity
6.9 Medium
Published
Jul 14, 2026
Updated
Jul 15, 2026
Reserved
May 22, 2026

Read the record on cve.org

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.

Scores

CVSSScoreVectorSource
4.06.9 MediumCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:NGitHub_M

Weaknesses

  • CWE-184 Incomplete List of Disallowed Inputs
  • CWE-918 Server-Side Request Forgery (SSRF)

Affected Products

ProductVersions
symfonysymfony
  • >= 5.4.0, < 5.4.53Affected
  • >= 6.0.0-BETA1, < 6.4.41Affected
  • >= 7.0.0-BETA1, < 7.4.13Affected
  • >= 8.0.0-BETA1, < 8.0.13Affected
http-clientsymfony
  • >= 5.4.0, < 5.4.53Affected
http-foundationsymfony
  • >= 6.0.0-BETA1, < 6.4.41Affected
  • >= 7.0.0-BETA1, < 7.4.13Affected
  • >= 8.0.0-BETA1, < 8.0.13Affected

References

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