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2026-11-04-9: The "private_ranges" Trusted Proxies Shortcut Trusts Clients Presenting an IPv4-Mapped, 6to4, Teredo or NAT64 Address as Reverse Proxies

unknown Affects symfony/framework-bundle, symfony/http-foundation, symfony/symfony. Feed 2026.11.09.1, updated 2026-11-08.

The "private_ranges" Trusted Proxies Shortcut Trusts Clients Presenting an IPv4-Mapped, 6to4, Teredo or NAT64 Address as Reverse Proxies

Package
symfony/framework-bundle Composer
Affected versions
>=7.1.0 and <7.2.0 or >=7.2.0 and <7.3.0 or >=7.3.0 and <7.4.0 or >=7.4.0 and <7.4.23 or >=8.0.0 and <8.1.0 or >=8.1.0 and <8.1.11
Fixed in
7.4.23, 8.1.11
Severity
unknown
Exploitation
not on CISA KEV
Source
friendsofphp

References

The "private_ranges" Trusted Proxies Shortcut Trusts Clients Presenting an IPv4-Mapped, 6to4, Teredo or NAT64 Address as Reverse Proxies

Package
symfony/http-foundation Composer
Affected versions
>=7.2.0 and <7.3.0 or >=7.3.0 and <7.4.0 or >=7.4.0 and <7.4.23 or >=8.0.0 and <8.1.0 or >=8.1.0 and <8.1.11
Fixed in
7.4.23, 8.1.11
Severity
unknown
Exploitation
not on CISA KEV
Source
friendsofphp

References

The "private_ranges" Trusted Proxies Shortcut Trusts Clients Presenting an IPv4-Mapped, 6to4, Teredo or NAT64 Address as Reverse Proxies

Package
symfony/symfony Composer
Affected versions
>=7.1.0 and <7.2.0 or >=7.2.0 and <7.3.0 or >=7.3.0 and <7.4.0 or >=7.4.0 and <7.4.23 or >=8.0.0 and <8.1.0 or >=8.1.0 and <8.1.11
Fixed in
7.4.23, 8.1.11
Severity
unknown
Exploitation
not on CISA KEV
Source
friendsofphp

References

NVD recordsymfony/framework-bundle advisoriessymfony/http-foundation advisoriessymfony/symfony advisories

Am I affected?

Find out in one command. phpwarden checks your composer.lock against this advisory and 20,000+ others, ranked by real-world exploitation (CISA KEV + EPSS). Free, offline, open data.

# PHP projects (recommended)
composer require --dev phpwarden/phpwarden
# then
vendor/bin/phpwarden deps composer.lock

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pipx install phpwarden   &&   phpwarden deps composer.lock

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