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Fencer Vulns
high 7.5

CVE-2026-29181 json

OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)

published 2026-04-07 7 mo ago modified 2026-09-17 52 d ago also EUVD-2026-19938 , GHSA-mh2q-q3fh-2475 , GO-2026-5506

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits
0
none known

Summary

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.

Patch / fix

  • go go.opentelemetry.io/otel 1.41.0
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.19 1788348594
  • Red Hat Cluster Observability Operator 1.5.0 1787593637
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.6 1788439505
  • Red Hat multicluster engine for Kubernetes 2.11 1780917881
  • Red Hat multicluster engine for Kubernetes 2.8 1784738758
  • govulncheck-vulndb SLES 16.0, SLES for SAP applications 16.0 0.0.20260727T201416-160000.1.1
  • containerized-data-importer SLE Module for Containers 15 SP7 1.64.0-150700.9.11.1

suse advisories SUSE-SU-2026:23216-1SUSE-SU-2026:23227-1SUSE-SU-2026:2493-1

  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260727T201416-160000.1.1
  • etcd openSUSE Tumbleweed 3.6.13-1.1

opensuse advisories openSUSE-SU-2026:21551-1openSUSE-SU-2026:11173-1

  • azurelinux-image-tools Azure Linux 3.0 1.3.0-1
  • etcd Azure Linux 3.0 3.5.30-2
  • ignition-flatcar Azure Linux 3.0 2.22.0-5

azure linux advisories AZL-82115AZL-82211AZL-84801

Azure Linux vulnerability data, Copyright (c) Microsoft Corporation, from https://github.com/microsoft/AzureLinuxVulnerabilityData via OSV, under the MIT licence; changed: normalised to fixed package versions per release. MIT

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-29181 updated cvss 7.5

github.com/open-telemetry/opentelemetry-go: OpenTelemetry-Go: Denial of Service via crafted multi-value baggage headers

  • Red Hat cert-manager Operator for Red Hat OpenShift cert-manager/jetstack-cert-manager-rhel9 Red Hat Multicluster Engine for Kubernetes multicluster-engine/work-rhel9, multicluster-engine/placement-rhel9, multicluster-engine/assisted-service-9-rhel9, multicluster-engine/multicloud-manager-rhel9, multicluster-engine/hypershift-rhel9-operator, multicluster-engine/registration-operator-rhel9, +3 more
    affected: no fix available
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/volsync-rhel9
    affected: no fix planned “Will not fix”
  • Red Hat OpenShift Container Platform 5 openshift5/ose-kube-rbac-proxy-rhel9
    affected: no fix available
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/multicluster-observability-rhel9-operator
    under investigation
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.17 cert-manager/cert-manager-operator-rhel9 1791788287, cert-manager/cert-manager-istio-csr-rhel9 1791378395
    fixed: vendor fix RHSA-2026:82336
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.19 cert-manager/cert-manager-istio-csr-rhel9 1788348594
    fixed: vendor fix RHSA-2026:63140
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.20 cert-manager/cert-manager-istio-csr-rhel9 1790223719, cert-manager/cert-manager-istio-csr-rhel9 1790589914
    fixed: vendor fix RHSA-2026:72475
  • Red Hat Cluster Observability Operator 1.5 cluster-observability-operator/cluster-observability-rhel9-operator 1787593637
    fixed: vendor fix RHSA-2026:61314
show 9 more
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.0 openshift-logging/cluster-logging-rhel9-operator 1791830134
    fixed: vendor fix RHSA-2026:83013
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.2 openshift-logging/cluster-logging-rhel9-operator 1789050399
    fixed: vendor fix RHSA-2026:68349
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.5 openshift-logging/cluster-logging-rhel9-operator 1789659166
    fixed: vendor fix RHSA-2026:70870
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.6 openshift-logging/cluster-logging-rhel9-operator 1788439505
    fixed: vendor fix RHSA-2026:66521
  • Red Hat multicluster engine for Kubernetes 2.8 multicluster-engine/hypershift-addon-rhel9-operator 1784738758
    fixed: vendor fix RHSA-2026:47735
  • Red Hat multicluster engine for Kubernetes 2.11 multicluster-engine/hypershift-addon-rhel9-operator 1780917881
    fixed: vendor fix RHSA-2026:25271
  • Red Hat Cluster Observability Operator 1.5 cluster-observability-operator/perses-rhel9 1787593946, cluster-observability-operator/thanos-rhel9 1787594087, cluster-observability-operator/korrel8r-rhel9 1787593952, cluster-observability-operator/prometheus-rhel9 1787593705, cluster-observability-operator/alertmanager-rhel9 1787593799, cluster-observability-operator/perses-rhel9-operator 1787593697, +18 more Red Hat Logging Subsystem for Red Hat OpenShift 6.0 openshift-logging/vector-rhel9 1791777198, openshift-logging/eventrouter-rhel9 1791500947, openshift-logging/logging-loki-rhel9 1791500729, openshift-logging/loki-rhel9-operator 1791499216, openshift-logging/opa-openshift-rhel9 1791500883, openshift-logging/loki-operator-bundle 1791504713, +3 more Red Hat Logging Subsystem for Red Hat OpenShift 6.2 openshift-logging/vector-rhel9 1789050538, openshift-logging/eventrouter-rhel9 1789050399, openshift-logging/logging-loki-rhel9 1789050556, openshift-logging/loki-rhel9-operator 1789050212, openshift-logging/opa-openshift-rhel9 1789050227, openshift-logging/loki-operator-bundle 1789053077, +3 more Red Hat Logging Subsystem for Red Hat OpenShift 6.5 openshift-logging/vector-rhel9 1789659541, openshift-logging/eventrouter-rhel9 1789659145, openshift-logging/logging-loki-rhel9 1789736915, openshift-logging/loki-rhel9-operator 1789736807, openshift-logging/opa-openshift-rhel9 1789659129, openshift-logging/loki-operator-bundle 1789737942, +3 more Red Hat Logging Subsystem for Red Hat OpenShift 6.6 openshift-logging/vector-rhel9 1788439747, openshift-logging/eventrouter-rhel9 1788375796, openshift-logging/logging-loki-rhel9 1788156390, openshift-logging/loki-rhel9-operator 1788154255, openshift-logging/opa-openshift-rhel9 1788153362, openshift-logging/loki-operator-bundle 1788158124, +3 more Red Hat Multicluster Engine for Kubernetes multicluster-engine/registration-rhel9
    +2 more products
    Red Hat multicluster engine for Kubernetes 2.8 multicluster-engine/hive-rhel9 1784896748, multicluster-engine/work-rhel9 1784136764, multicluster-engine/discovery-rhel9 1784306906, multicluster-engine/placement-rhel9 1784332158, multicluster-engine/console-mce-rhel9 1785078604, multicluster-engine/must-gather-rhel9 1784590739, +20 more Red Hat multicluster engine for Kubernetes 2.11 multicluster-engine/hive-rhel9 1780918072, multicluster-engine/work-rhel9 1780917940, multicluster-engine/discovery-rhel9 1780586101, multicluster-engine/placement-rhel9 1780918183, multicluster-engine/console-mce-rhel9 1780910888, multicluster-engine/must-gather-rhel9 1780876670, +25 more
    not affected: vulnerable code not present
  • Red Hat Advanced Cluster Management for Kubernetes 2 rhacm2/acm-must-gather-rhel9
    not affected: vulnerable code cannot be controlled by adversary
  • Red Hat OpenShift Container Platform 4 openshift4/ose-kube-rbac-proxy-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
7 mo ago

Exploit prediction

0.82% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-mh2q-q3fh-2475 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CISA ADP 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
go go.opentelemetry.io/otel
>=1.36.0, <1.41.0
1.41.0

Affected products

  • open-telemetry opentelemetry-go
  • Red Hat Cert Manager support for Red Hat OpenShift release 1.19
  • Red Hat Cluster Observability Operator 1.5.0
  • Red Hat Logging Subsystem for Red Hat OpenShift 6.6
  • Red Hat multicluster engine for Kubernetes 2.11
  • Red Hat multicluster engine for Kubernetes 2.8
  • Red Hat cert-manager Operator for Red Hat OpenShift
  • Red Hat Multicluster Engine for Kubernetes
  • Red Hat Red Hat Advanced Cluster Management for Kubernetes 2

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.