PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-11437 perfree CVE debrief

A vulnerability was found in perfree go-fastdfs-web up to 1.3.7. The function checkServer in the file /install/checkServer of the Installation Endpoint is affected, allowing for server-side request forgery (SSRF). The attack can be executed remotely. The exploit has been published and may be used.

Vendor
perfree
Product
go-fastdfs-web
CVSS
MEDIUM 5.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-06
Original CVE updated
2026-07-23
Advisory published
2026-06-06
Advisory updated
2026-07-23

Who should care

Users of perfree go-fastdfs-web up to 1.3.7 should be aware of this vulnerability and take necessary actions to mitigate the risk.

Technical summary

The vulnerability is caused by a flaw in the checkServer function of the /install/checkServer endpoint, which allows for SSRF. The CVSS score is 5.5 (MEDIUM).

Defensive priority

MEDIUM

Recommended defensive actions

  • Update to a version of go-fastdfs-web that is not vulnerable.
  • Implement additional security measures to prevent SSRF attacks.

Evidence notes

The vendor was contacted early about this disclosure but did not respond in any way.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11437 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11437

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

  • CVE-2026-11437 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11437

    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.