---
id: CVE-2026-29181
title: OpenTelemetry-Go is the Go implementation of OpenTelemetry
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
  ampli…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-770
vendor: opentelemetry
product: opentelemetry
affected:
  - 'opentelemetry >= 1.36.0, < 1.41.0'
patched:
  - opentelemetry 1.41.0
published: '2026-04-07'
updated: '2026-09-11'
sourceUpdated: '2026-09-11T13:17:25.487'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-29181'
references:
  - url: >-
      https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-mh2q-q3fh-2475
    label: security-advisories@github.com
  - url: 'https://access.redhat.com/errata/RHSA-2026:25271'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:47735'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:61314'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:63140'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/errata/RHSA-2026:66521'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://access.redhat.com/security/cve/CVE-2026-29181'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2456252'
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29181.json
    label: 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-29181'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-29181'
  - url: 'https://access.redhat.com/errata/RHSA-2026:68349'
  - url: 'https://access.redhat.com/errata/RHSA-2026:70870'
tags:
  - nvd
  - cve.org
  - exploit-available
  - csaf
  - vex
  - red-hat
exploitAvailable: true
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-04-08T15:36:53.783712Z'
epss: 0.0079
epssPercentile: 0.5479
ingestedAt: '2026-07-20T12:38:40.826Z'
---

## Overview

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.

## Affected

- `opentelemetry >= 1.36.0, < 1.41.0`

## Remediation

Upgrade past the affected range:

- `opentelemetry 1.41.0`

## Vendor advisories

- **RHSA-2026:61314** · Red Hat · fixed in: Cluster Observability Operator 1.5.0 · released 2026-08-31 · [advisory](https://access.redhat.com/errata/RHSA-2026:61314)
- **RHSA-2026:25271** · Red Hat · fixed in: multicluster engine for Kubernetes 2.11 · released 2026-06-11 · [advisory](https://access.redhat.com/errata/RHSA-2026:25271)
- **RHSA-2026:47735** · Red Hat · fixed in: multicluster engine for Kubernetes 2.8 · released 2026-07-29 · [advisory](https://access.redhat.com/errata/RHSA-2026:47735)
- **Red Hat VEX** · Important · affected: cert-manager Operator for Red Hat OpenShift, Multicluster Engine for Kubernetes, Red Hat Advanced Cluster Management for Kubernetes 2 · no fix planned: Red Hat Advanced Cluster Management for Kubernetes 2, cert-manager Operator for Red Hat OpenShift, Multicluster Engine for Kubernetes · updated 2026-09-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29181.json)
- **RHSA-2026:63140** · Red Hat · fixed in: Cert Manager support for Red Hat OpenShift release 1.19 · released 2026-09-03 · [advisory](https://access.redhat.com/errata/RHSA-2026:63140)
- **RHSA-2026:66521** · Red Hat · fixed in: Logging Subsystem for Red Hat OpenShift 6.6 · released 2026-09-10 · [advisory](https://access.redhat.com/errata/RHSA-2026:66521)
- **RHSA-2026:68349** · Red Hat · fixed in: Logging Subsystem for Red Hat OpenShift 6.2 · released 2026-09-16 · [advisory](https://access.redhat.com/errata/RHSA-2026:68349)
- **RHSA-2026:70870** · Red Hat · fixed in: Logging Subsystem for Red Hat OpenShift 6.5 · released 2026-09-23 · [advisory](https://access.redhat.com/errata/RHSA-2026:70870)