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01 Record

CVE-2026-3125

SSRF vulnerability in opennextjs-cloudflare via /cdn-cgi/ path normalization bypass

HighPUBLISHEDCNA: cloudflare
CNA base score7.7 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N

02 Description

SSRF vulnerability in opennextjs-cloudflare via /cdn-cgi/ path normalization bypass

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.37% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 31.4% of scored records. A rank, not a probability.
NVD base score
7.7 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:N/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
NVD analysis status
Analyzed. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-03-04 18:14Z7 MO AGO
Last updated
2026-03-04 18:58Z7 MO AGO
Reserved
2026-02-24
Assigning CNA
cloudflare
Record state
PUBLISHED
Severity
High (CVSS 7.7)
CNA CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:H/SI:N/SA:N
Weaknesses
  • CWE-706Use of Incorrectly-Resolved Name or ReferenceClass
  • CWE-918Server-Side Request Forgery (SSRF)Base
Data version
5.2
Document digest
cfe62538632c50610e6869690794f7a1229e328ca93d48246e56744b7bf07c65

05 Affected products

VendorProductVersionsPlatforms
opennextjs@opennextjs/cloudflare0 to < 1.17.1Cloudflare Workers

06 References

07 Remediation

Server-side updates to Cloudflare's Workers platform to block backslash path normalization bypasses for /cdn-cgi requests. The update automatically mitigates the issue for all existing and any future sites deployed to Cloudflare Workers.

In addition to the platform level fix, root cause fix https://github.com/opennextjs/opennextjs-cloudflare/pull/1147 has been implemented to the Cloudflare adapter for Open Next. The patched version of the adapter is found at @opennextjs/cloudflare@1.17.1 ( https://www.npmjs.com/package/@opennextjs/cloudflare https://www.npmjs.com/package/@opennextjs/cloudflare )

Dependency update https://github.com/opennextjs/opennextjs-cloudflare/pull/1150 to the Next.js template used with create-cloudflare (c3) to use the fixed version of the Cloudflare adapter for Open Next.