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CVE-2026-48736

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

HIGH
8.6
CVSS Score
Published: July 14, 2026 at 07:09 PM UTC
Updated: July 16, 2026 at 03:30 AM UTC
4 products affected across 2 vendorsSymfonySymfonyHTTP Client

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Severity
HIGH8.6
Exploit prediction
EPSS 0.6%
SSVC
No known exploit

Description

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

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Symfony· Sensiolabsdrupal
95%
5.4.0 ≤ v < 5.4.436.4.0 ≤ v < 6.4.417.0.0 ≤ v < 7.4.138.0.0 ≤ v < 8.0.13
Affected range stops below 5.4.43, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.41, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.4.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.13, so it looks safe — our inference, not a vendor statement
HTTP Client· Symfony
60%
v < 5.4.53
Affected range stops below 5.4.53, so it looks safe — our inference, not a vendor statement
HTTP Foundation· Symfony
60%
v < 6.4.41v < 7.4.13v < 8.0.13
Affected range stops below 6.4.41, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.4.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.13, so it looks safe — our inference, not a vendor statement
Symfony· Symfonycomposer
60%
v < 5.4.53v < 6.4.41v < 7.4.13v < 8.0.13
Affected range stops below 5.4.53, so it looks safe — our inference, not a vendor statement
Affected range stops below 6.4.41, so it looks safe — our inference, not a vendor statement
Affected range stops below 7.4.13, so it looks safe — our inference, not a vendor statement
Affected range stops below 8.0.13, so it looks safe — our inference, not a vendor statement

References (6)

x_refsource_CONFIRMPatchVendor Advisory
Source: cverecord
https://github.com/symfony/symfony/security/advisories/GHSA-38cx-cq6f-5755
x_refsource_MISCPatch
Source: cverecord
https://github.com/symfony/symfony/commit/82765368cf74177c36613575182f168a2eb765b2
x_refsource_MISCPatch
Source: cverecord
https://github.com/symfony/symfony/commit/85b831555be8ea1f43bf01078afe87bc4c92f65e
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/symfony/symfony/releases/tag/v5.4.53
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/symfony/symfony/releases/tag/v6.4.41
x_refsource_MISCRelease Notes
Source: cverecord
https://github.com/symfony/symfony/releases/tag/v7.4.13

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.6HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusANALYZED
CWE
CWE-184CWE-918

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