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

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Summary

CVECVE-2026-48736
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-14 20:17:09 UTC
Updated2026-07-16 03:12:24 UTC
DescriptionSymfony 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.

Risk And Classification

Primary CVSS: v4.0 6.9 MEDIUM from [email protected]

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/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

EPSS: 0.004570000 probability, percentile 0.368080000 (date 2026-07-15)

Problem Types: CWE-184 | CWE-918 | CWE-184 CWE-184: Incomplete List of Disallowed Inputs | CWE-918 CWE-918: Server-Side Request Forgery (SSRF)

VersionSourceTypeScoreSeverityVector
4.0[email protected]Secondary6.9MEDIUMCVSS: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/C...
4.0CNADECLARED6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:L/SA:N
3.1[email protected]Primary8.6HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
Present
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
None
Sub Conf.
High
Sub Integrity
Low
Sub Availability
None

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/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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Sensiolabs Symfony All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Symfony Symfony affected >= 5.4.0, < 5.4.53 Not specified
CNA Symfony Symfony affected >= 6.0.0-BETA1, < 6.4.41 Not specified
CNA Symfony Symfony affected >= 7.0.0-BETA1, < 7.4.13 Not specified
CNA Symfony Symfony affected >= 8.0.0-BETA1, < 8.0.13 Not specified
CNA Symfony Http-client affected >= 5.4.0, < 5.4.53 Not specified
CNA Symfony Http-foundation affected >= 6.0.0-BETA1, < 6.4.41 Not specified
CNA Symfony Http-foundation affected >= 7.0.0-BETA1, < 7.4.13 Not specified
CNA Symfony Http-foundation affected >= 8.0.0-BETA1, < 8.0.13 Not specified

References

ReferenceSourceLinkTags
github.com/symfony/symfony/releases/tag/v5.4.53 [email protected] github.com Release Notes
github.com/symfony/symfony/releases/tag/v6.4.41 [email protected] github.com Release Notes
github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2 [email protected] github.com Patch
github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65e [email protected] github.com Patch
github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755 [email protected] github.com Patch, Vendor Advisory
github.com/symfony/symfony/releases/tag/v7.4.13 [email protected] github.com Release Notes
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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