# CVE-2026-48736: symfony: Symfony is a PHP framework for web and console applications and a set of reusable PHP components

CVE-2026-48736 is fixed in symfony on 1 platform, first by DEBIAN-CVE-2026-48736, released June 24, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-48736
- Priority: High
- CVSS: 8.6 (high)
- EPSS: 0.0057
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 14, 2026

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | symfony Debian 12.15 (bookworm) | 5.4.53+dfsg-0+deb12u1 | [DEBIAN-CVE-2026-48736](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48736.md) | Jun 24, 2026 |
| Linux | symfony Debian 13.5 (trixie) | 6.4.41+dfsg-0+deb13u1 | [DEBIAN-CVE-2026-48736](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48736.md) | Jun 24, 2026 |
| Linux | symfony Debian 14 | 7.4.13+dfsg-1 | [DEBIAN-CVE-2026-48736](https://patchblox.com/security/data/fix/linux/debian-cve-2026-48736.md) | Jun 24, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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