CVE-2026-86590 Eclipse Foundation CVE debrief

Who should care

Defenders responsible for Eclipse Che instances, particularly those with exposed or internet-facing deployments, should assess their exposure and apply the vendor-provided patch. They should also monitor for potential exploitation attempts and review the operator-configured allowlist to ensure it is properly configured.

Why it matters

CVE-2026-86590 is a server-side request forgery (SSRF) vulnerability in Eclipse Che that allows an authenticated user to read responses from internal network addresses. Defenders should prioritize verifying exposure, applying the vendor-provided patch, and monitoring for potential exploitation attempts.

• Verify and apply the patch to prevent potential SSRF exploitation.
• Assess and restrict access to the affected endpoint to limit exposure.
• Monitor for potential internal network reconnaissance and data exfiltration attempts.
• Review and update the operator-configured allowlist to ensure it is properly configured.

Technical summary

The dashboard backend's POST /dashboard/api/data/resolver endpoint in Eclipse Che versions 7.79.0 through 7.121.0 passes a caller-supplied URL directly to an outbound HTTP GET request with no host filtering. This allows an authenticated user to exploit the server-side request forgery (SSRF) vulnerability to read responses from internal network addresses, including the cloud instance metadata service, loopback interfaces, RFC-1918 private ranges, and in-cluster Kubernetes services. The operator-configured allowlist is not consulted. The vulnerability is fixed in version 7.122.0, which adds private-address blocking, IPv4-mapped IPv6 bypass prevention, operator allowlist enforcement, and disables HTTP redirects on the outbound request.

Defensive priority

Defenders should prioritize verifying exposure and applying the vendor-provided patch.

Recommended defensive actions

• Verify if the Eclipse Che instance is exposed to the vulnerability by checking the version and configuration.
• Apply the vendor-provided patch to upgrade to version 7.122.0 or later.
• Monitor for potential exploitation attempts and internal network reconnaissance.
• Review and update the operator-configured allowlist to ensure it is properly configured.
• Assess and restrict access to the affected endpoint to limit exposure.
• Review compensating controls for exposed systems while remediation is scheduled and verified.
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability and its fix. The vulnerability was reported by a researcher and verified by the vendor. The fix was released in version 7.122.0, which adds private-address blocking, IPv4-mapped IPv6 bypass prevention, operator allowlist enforcement, and disables HTTP redirects on the outbound request. The evidence is limited to publicly available information and may not reflect the full scope of the vulnerability.

Sources and 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.