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CVE-2026-48736 Sensiolabs CVE debrief

The CVE record for CVE-2026-48736 was published on 2026-07-14T20:17:09.943Z and has not been modified since then. The NVD entry is currently Analyzed. This vulnerability affects Symfony framework versions 5.4.0 to 5.4.53, 6.4.0 to 6.4.41, 7.0.0 to 7.4.13, and 8.0.0 to 8.0.13, allowing attacker-supplied URLs to represent private IPv4 targets. The vulnerability is classified as a medium priority due to its CVSS score of 6.9.

Vendor
Sensiolabs
Product
Symfony
CVSS
MEDIUM 6.9
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-14
Original CVE updated
2026-07-16
Advisory published
2026-07-14
Advisory updated
2026-07-16

Who should care

Users of Symfony framework versions 5.4.0 to 5.4.53, 6.4.0 to 6.4.41, 7.0.0 to 7.4.13, and 8.0.0 to 8.0.13 should be aware of this vulnerability. Affected operators, platforms, vulnerability-management, and security teams should review and update affected systems and applications, monitor for suspicious activity, and implement compensating controls.

Technical summary

Symfony, a PHP framework for web and console applications, had a vulnerability in its NoPrivateNetworkHttpClient and IpUtils::PRIVATE_SUBNETS implementation. The issue allowed attacker-supplied URLs to represent private IPv4 targets, which were not blocked by IpUtils::isPrivateIp(). This vulnerability affected versions 5.4.0 to 5.4.53, 6.4.0 to 6.4.41, 7.0.0 to 7.4.13, and 8.0.0 to 8.0.13. The vulnerability is fixed in versions 5.4.53, 6.4.41, 7.4.13, and 8.0.13.

Defensive priority

Medium priority due to the CVSS score of 6.9 and the potential for attackers to exploit this vulnerability.

Recommended defensive actions

  • Update Symfony to version 5.4.53, 6.4.41, 7.4.13, or 8.0.13
  • Review and update affected systems and applications
  • Monitor for suspicious activity
  • Implement compensating controls
  • Verify inventory of systems and applications
  • Review relevant monitoring, detection, and logs for exposed assets
  • Track exceptions and retest remediated assets

Evidence notes

The CVE record and NVD entry provide information on the vulnerability and affected versions. The vendor, Sensiolabs, has provided patches and release notes for the affected versions. Evidence limits suggest that further verification is needed to confirm affected scope and severity. Defenders should verify inventory of systems and applications, review compensating controls, and monitor for suspicious activity. Additional review of vendor documentation and security advisories may be necessary to fully understand the vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-48736 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-48736

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-48736 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-48736

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.