CVE-2026-29181
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
Product
Opentelemetry
PublishedApr 7, 2026
First seenApr 7, 2026
Weakness typeCWE-770Allocation of resources without limits
How to fix
Update
- opentelemetry opentelemetry1.41.0 or later
- go.opentelemetry.io/otel1.41.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| opentelemetry opentelemetry | 1.36.0 ≤ v < 1.41.0 | 1.41.0 |
| go.opentelemetry.io/otelGo | 1.36.0 ≤ v < 1.41.0 | 1.41.0 |
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