Review reviewHigh

CVE-2026-29181

open-telemetry opentelemetry-go, multicluster engine for Kubernetes 2.11.0, multicluster engine for Kubernetes 2.8

OpenTelemetry-Go is the Go implementation of OpenTelemetry. From 1.36.0 to 1.40.0, multi-value baggage: header extraction parses each header field-value independently and aggregates members across values. This allows an attacker to amplify cpu and allocations by sending many baggage: header lines, even when each individual value is within the 8192-byte per-value parse limit. This vulnerability is fixed in 1.41.0.

CVSS: 7.5
EPSS: 0.57%
CISA KEV: Not listed
Published: 2026.04.08

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.57%

Technical severityCVSS 7.5

Vulnerability overview

Affected product and versions

Product: open-telemetry opentelemetry-go, multicluster engine for Kubernetes 2.11.0, multicluster engine for Kubernetes 2.8
Affected versions: >= >= 1.36.0, < 1.41.0, >= 1.36.0 < 1.41.0
Fixed versions: 1.41.0

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that open-telemetry opentelemetry-go, multicluster engine for Kubernetes 2.11.0, multicluster engine for Kubernetes 2.8 and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-770