Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Sensiolabs | Symfony | >= 5.4.0, < 5.4.43 |
Related Weaknesses (CWE)
References
- https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765Patch
- https://github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f6Patch
- https://github.com/symfony/symfony/releases/tag/v5.4.53Release Notes
- https://github.com/symfony/symfony/releases/tag/v6.4.41Release Notes
- https://github.com/symfony/symfony/releases/tag/v7.4.13Release Notes
- https://github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755PatchVendor Advisory
FAQ
What is CVE-2026-48736?
CVE-2026-48736 is a vulnerability with a CVSS score of 8.6 (HIGH). 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_SUBN...
How severe is CVE-2026-48736?
CVE-2026-48736 has been rated HIGH with a CVSS base score of 8.6/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-48736?
Check the references section above for vendor advisories and patch information. Affected products include: Sensiolabs Symfony.