CVE-2026-48784

Symfony: UrlGenerator Dot-Segment Encoding Skips Every Other Chained `../` or `./` → Generated URL Collapses Off-Route Under RFC 3986 Normalization

MEDIUM

6.1

CVSS Score

Published: July 14, 2026 at 07:04 PM UTC

Updated: July 15, 2026 at 03:04 PM UTC

3 products affected across 2 vendorsSymfonySymfonyRouting

Using symfony by symfony?

Get instant alerts when new vulnerabilities affect symfony - before attackers find them.

Real-time alertsTrack your software stackFree plan available

Start Free Sign In

Severity

MEDIUM6.1

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 5.4.53, 6.4.41, 7.4.13, and 8.0.13, UrlGenerator::doGenerate() used strtr() dot-segment encoding that skipped every other chained ../ or ./ segment, allowing attacker-controlled route parameters to generate URLs that collapse to a different path under RFC 3986 normalization. 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%

v < 5.4.536.0.0 ≤ v < 6.4.417.0.0 ≤ v < 7.4.138.0.0 ≤ v < 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

Routing · Symfony

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

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

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (5)

x_refsource_CONFIRMPatchVendor Advisory

Source: cverecord

https://github.com/symfony/symfony/security/advisories/GHSA-h5x3-xfc9-m39h

x_refsource_MISCPatch

Source: cverecord

https://github.com/symfony/symfony/commit/4b63c3a3f7af04ecd79c89a594b0b02a01990b1d

x_refsource_MISCProductRelease Notes

Source: cverecord

https://github.com/symfony/symfony/releases/tag/v5.4.53

x_refsource_MISCProductRelease Notes

Source: cverecord

https://github.com/symfony/symfony/releases/tag/v6.4.41

x_refsource_MISCProductRelease Notes

Source: cverecord

https://github.com/symfony/symfony/releases/tag/v7.4.13

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

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

CVSS

6.1MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: NONE
User Interaction: REQUIRED
Scope: CHANGED
Confidentiality: LOW
Integrity: LOW
Availability: NONE

Vector?

Quick Info

StatusANALYZED

CWE

CWE-172CWE-601

Get alerted

Stop reading CVE feeds looking for your own stack

Track the products you run and VulnTracker tells you when a new CVE affects them — with what is known about fixing it, and nothing about the rest.

Create account Sign in

Free plan, no card