CVE-2026-48736

medium

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.

References

https://github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755

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

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

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

https://github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65e

https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2

Details

Source: Mitre, NVD

Published: 2026-07-14

Updated: 2026-07-14

Risk Information

CVSS v2

Base Score: 7.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Severity: High

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical

CVSS v4

Base Score: 6.9

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

Severity: Medium

EPSS

EPSS: 0.00029