CVE-2026-48736
Fixed in a distro release EPSS <1%CVSS 6.9
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.
Products: symfony, symfony http-client, symfony http-foundation
Fixed upstream
| Ecosystem | Package | Fixed in |
|---|---|---|
| Packagist | symfony/http-client | 5.4.53 |
| Packagist | symfony/http-foundation | 6.4.41 |
| Packagist | symfony/http-foundation | 7.4.13 |
| Packagist | symfony/http-foundation | 8.0.13 |
| Packagist | symfony/symfony | 5.4.53 |
| Packagist | symfony/symfony | 6.4.41 |
| Packagist | symfony/symfony | 7.4.13 |
| Packagist | symfony/symfony | 8.0.13 |
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Chainguard | nextcloud-server-31 | no fix |
| Chainguard | nextcloud-server-32 | 32.0.11-r2 |
| Chainguard | nextcloud-server-33 | 33.0.5-r4 |
| Chainguard | nextcloud-server-34 | 34.0.1-r0 |
| Debian 12 | symfony | 5.4.53+dfsg-0+deb12u1 |
| Debian 13 | symfony | 6.4.41+dfsg-0+deb13u1 |
| Debian 14 | symfony | 7.4.13+dfsg-1 |
| Ubuntu 16.04 LTS | symfony | no fix |
| Ubuntu 25.10 | symfony | no fix |
| Ubuntu 26.04 LTS | symfony | no fix |
| Ubuntu 26.10 | symfony | no fix |
| Ubuntu Pro 18.04 LTS | symfony | no fix |
| Ubuntu Pro 20.04 LTS | symfony | no fix |
| Ubuntu Pro 22.04 LTS | symfony | no fix |
| Ubuntu Pro 24.04 LTS | symfony | no fix |
| Wolfi | nextcloud-server-32 | 32.0.11-r2 |
| Wolfi | nextcloud-server-33 | 33.0.5-r4 |