CVE-2026-48736
HIGH severity · CVSS 8.6 · CWE-184
8.6CVSS HIGH
Summary
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.
Impact & exploitability
Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
Confidentiality impactHigh
Integrity impactNone
Availability impactNone
Exploit probability (EPSS)0%
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N
Affected products we track (1)
Recommendation
Apply the vendor fix promptly. Open any affected product above for its exact safe version.
Official patch: https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2 ↗
Additional information
- NVD record
- https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2Patch
- https://github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65ePatch
- https://github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755Patch
- https://github.com/symfony/symfony/releases/tag/v5.4.53
- https://github.com/symfony/symfony/releases/tag/v6.4.41
- https://github.com/symfony/symfony/releases/tag/v7.4.13