CVE-2026-48736: 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…

PriorityP351high8.6CVSS 3.1

AVNACLPRNUINSCCHINAN

EPSS

0.46%

37.2th percentile

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.

Affected

20 ranges

Vendor	Product	Version range	Fixed in
sensiolabs	symfony	>= 5.4.0 < 5.4.43	5.4.43
sensiolabs	symfony	>= 6.4.0 < 6.4.41	6.4.41
sensiolabs	symfony	>= 7.0.0 < 7.4.13	7.4.13
sensiolabs	symfony	>= 8.0.0 < 8.0.13	8.0.13
symfony	http-client	—	—
symfony	http-client	>= 5.4.0 < 5.4.53	5.4.53
symfony	http-foundation	—	—
symfony	http-foundation	—	—
symfony	http-foundation	—	—
symfony	http-foundation	>= 6.4.0 < 6.4.41	6.4.41
symfony	http-foundation	>= 7.0.0 < 7.4.13	7.4.13
symfony	http-foundation	>= 8.0.0 < 8.0.13	8.0.13
symfony	symfony	—	—
symfony	symfony	—	—
symfony	symfony	—	—
symfony	symfony	—	—
symfony	symfony	>= 5.4.0 < 5.4.53	5.4.53
symfony	symfony	>= 6.4.0 < 6.4.41	6.4.41
symfony	symfony	>= 7.0.0 < 7.4.13	7.4.13
symfony	symfony	>= 8.0.0 < 8.0.13	8.0.13

CVSS provenance

nvdv3.18.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

nvdv4.06.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

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