7.5High
CVE-2026-29181OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)
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.
Weakness (CWE):
CWE-770
Data: CVE.org, NVD, CISA KEV, FIRST EPSS, Ubuntu. Published as the sources state it, in English.
Affected products and versions
| Vendor | Product | Versions | |
|---|---|---|---|
| cert manager | 1.19 | — | |
| cluster observability operator | 1.5 | — | |
| logging | 6.6 | — | |
| multicluster engine | 2.11 | — | |
| multicluster engine | 2.8 | — | |
| open-telemetry | opentelemetry-go | >= 1.36.0, < 1.41.0 | |
| opentelemetry | opentelemetry | 1.36.0 – < 1.41.0 | |
| Red Hat | cert-manager Operator for Red Hat OpenShift | all versions | |
| Red Hat | Cert Manager support for Red Hat OpenShift release 1.19 | all versions | |
| Red Hat | Cluster Observability Operator 1.5.0 | all versions | |
| Red Hat | Logging Subsystem for Red Hat OpenShift 6.6 | all versions | |
| Red Hat | Multicluster Engine for Kubernetes | all versions | |
| Red Hat | multicluster engine for Kubernetes 2.11 | all versions | |
| Red Hat | multicluster engine for Kubernetes 2.8 | all versions | |
| Red Hat | Red Hat Advanced Cluster Management for Kubernetes 2 | all versions |
References and patches
- https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-mh2q-q3fh-2475 ExploitVendor Advisory
- https://access.redhat.com/errata/RHSA-2026:25271
- https://access.redhat.com/errata/RHSA-2026:47735
- https://access.redhat.com/errata/RHSA-2026:61314
- https://access.redhat.com/errata/RHSA-2026:63140
- https://access.redhat.com/errata/RHSA-2026:66521
- https://access.redhat.com/security/cve/CVE-2026-29181
- https://bugzilla.redhat.com/show_bug.cgi?id=2456252
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29181.json
CPE matches (NVD) (1)
cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:go:*:*≥ 1.36.0 < 1.41.0