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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.

PUBLISHED Reserved 2026-05-22 | Published 2026-07-14 | Updated 2026-07-14 | Assigner GitHub_M




MEDIUM: 6.9CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N

Problem types

CWE-184: Incomplete List of Disallowed Inputs

CWE-918: Server-Side Request Forgery (SSRF)

Product status

>= 5.4.0, < 5.4.53
affected

>= 6.0.0-BETA1, < 6.4.41
affected

>= 7.0.0-BETA1, < 7.4.13
affected

>= 8.0.0-BETA1, < 8.0.13
affected

>= 5.4.0, < 5.4.53
affected

>= 6.0.0-BETA1, < 6.4.41
affected

>= 7.0.0-BETA1, < 7.4.13
affected

>= 8.0.0-BETA1, < 8.0.13
affected

References

github.com/...ymfony/security/advisories/GHSA-38cx-cq6f-5755

github.com/...ommit/82765368cf74177c36613575182f168a2eb765b2

github.com/...ommit/85b831555be8ea1f43bf01078afe87bc4c92f65e

github.com/symfony/symfony/releases/tag/v5.4.53

github.com/symfony/symfony/releases/tag/v6.4.41

github.com/symfony/symfony/releases/tag/v7.4.13

cve.org (CVE-2026-48736)

nvd.nist.gov (CVE-2026-48736)

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