CVE-2026-47256 open-telemetry CVE debrief

Who should care

Defenders responsible for OpenTelemetry deployments, especially those using the Sentry exporter, should assess exposure to this vulnerability and prioritize upgrading to version 0.154.0 or later.

Why it matters

CVE-2026-47256 is a vulnerability in OpenTelemetry's Sentry exporter that allows an attacker to redirect exported telemetry by manipulating the service.name resource attribute. Defenders should prioritize verifying exposure in OpenTelemetry deployments, especially those using the Sentry exporter, and upgrade to version 0.154.0 or later.

• Verify exposure in OpenTelemetry deployments using the Sentry exporter
• Upgrade to OpenTelemetry version 0.154.0 or later to prevent telemetry redirection
• Monitor for suspicious activity in Sentry organizations

Technical summary

The OpenTelemetry Sentry exporter is vulnerable to a URL manipulation attack due to improper validation of the service.name resource attribute. This allows an attacker to redirect exported telemetry and potentially access sensitive endpoints within the configured Sentry organization. The vulnerability is caused by the Sentry exporter reading the remote OTLP sender-controlled service.name resource attribute and interpolating it into a Sentry API URL without proper validation. This can lead to unauthorized access to administrative, organization, member, or key endpoints within the configured Sentry organization.

Defensive priority

Defenders should prioritize verifying exposure in OpenTelemetry deployments, especially those using the Sentry exporter, and upgrade to version 0.154.0 or later.

Recommended defensive actions

• Verify OpenTelemetry deployments using the Sentry exporter and assess exposure to this vulnerability
• Upgrade to OpenTelemetry version 0.154.0 or later
• Monitor for suspicious activity in Sentry organizations
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability is caused by the Sentry exporter reading the remote OTLP sender-controlled service.name resource attribute and interpolating it into a Sentry API URL without proper validation. This allows an attacker to manipulate the URL and potentially access administrative, organization, member, or key endpoints within the configured Sentry organization.

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.