chore(deps): update dependency symfony/http-foundation to v7.4.13 [security]

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
symfony/http-foundation (source)	7.4.8 → 7.4.13

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

CVE-2026-48736 / GHSA-38cx-cq6f-5755

More information

Details

Description

Symfony\Component\HttpClient\NoPrivateNetworkHttpClient is documented as a decorator that blocks requests to private networks by default. The list of blocked subnets (Symfony\Component\HttpFoundation\IpUtils::PRIVATE_SUBNETS on 6.4+, a private constant in NoPrivateNetworkHttpClient on 5.4) enumerates RFC1918, loopback, link-local and IPv4-mapped IPv6 (::ffff:0:0/96) prefixes, but omits the remaining IPv6 transition forms that can embed a private IPv4 destination: 6to4 (2002::/16, RFC 3056), Teredo (2001::/32, RFC 4380), NAT64 (64:ff9b::/96, RFC 6052 and 64:ff9b:1::/48, RFC 8215) and IPv4-compatible IPv6 (::/96, RFC 4291 §2.5.5.1).

IpUtils::checkIp6() is a pure bitwise CIDR comparison against the constants list and never extracts the embedded IPv4, so an attacker who can supply a URL writes the loopback / RFC1918 IPv4 target as e.g. http://[2002:7f00:1::]/ (6to4 → 127.0.0.1), http://[64:ff9b::7f00:1]/ (NAT64 → 127.0.0.1), http://[::7f00:1]/ (IPv4-compatible → 127.0.0.1) or http://[2001::1]/ (Teredo). IpUtils::isPrivateIp() returns false and NoPrivateNetworkHttpClient dispatches the request.

Real-world reachability of the embedded IPv4 depends on the deploy's IPv6 routing (6to4 tunnel interface, upstream NAT64 gateway, kernel handling of IPv4-compatible addresses), but the security boundary the decorator promises — the dispatch decision — is crossed regardless of whether the packet ultimately lands on the embedded IPv4.

Resolution

The private-subnet list now includes ::/96, 2002::/16, 2001::/32, 64:ff9b::/96 and 64:ff9b:1::/48. Blanket blocking of these prefixes matches the policy applied by Chromium and Mozilla's Private Network Access; server-side HTTPS APIs are not legitimately published on these prefixes.

The patches for this issue are available here for branch 5.4 and here for branch 6.4 (and forward-ported to 7.4, 8.0 and 8.1).

Credits

Symfony would like to thank tonghuaroot for reporting the issue and Nicolas Grekas for providing the fix.

Severity

• CVSS Score: 6.3 / 10 (Medium)
• Vector String: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

References

• 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://symfony.com/cve-2026-48736
• https://github.com/advisories/GHSA-38cx-cq6f-5755

This data is provided by the GitHub Advisory Database (CC-BY 4.0).

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Release Notes

symfony/http-foundation (symfony/http-foundation)

v7.4.13

Compare Source

Changelog (symfony/http-foundation@v7.4.7...v7.4.13)

• security #cve-2026-48736 Block IPv6 transition forms in IpUtils::PRIVATE_SUBNETS (@​nicolas-grekas)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.08%. Comparing base (aee3661) to head (4dd6b94).

Additional details and impacted files

@@            Coverage Diff            @@
##                dev    #3068   +/-   ##
=========================================
  Coverage     97.08%   97.08%           
  Complexity     2531     2531           
=========================================
  Files           392      392           
  Lines         11555    11555           
=========================================
  Hits          11218    11218           
  Misses          337      337           

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