Packagist/symfony/http-client CVE-2026-48736: medium, EPSS 0.57%

Symfony: IpUtils::PRIVATE_SUBNETS Omits IPv6 Transition Forms (6to4, NAT64, Teredo, IPv4-compatible): SSRF Bypass in NoPrivateNetworkHttpClient

Action: Upgrade symfony/http-client to 5.4.53 or later.

composer require symfony/http-client:5.4.53

Affected

Fixed versions

Sources

• osv: GHSA-38cx-cq6f-5755
• https://github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755
• https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2
• https://github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65e
• https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-client/CVE-2026-48736.yaml
• https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/http-foundation/CVE-2026-48736.yaml
• https://github.com/FriendsOfPHP/security-advisories/blob/master/symfony/symfony/CVE-2026-48736.yaml
• https://github.com/symfony/symfony
• https://symfony.com/cve-2026-48736

CVE-2026-48736 · published 2026-06-15T17:31:28Z · modified 2026-09-10T03:51:07.914923830Z · JSON