CVE-2026-41178 OpenTelemetry-Go's baggage parsing no longer caps raw header length
Medium 5.3
Published
Updated
Check this codebase for CVE-2026-41178 and fix it if it is affected.
What it is: CVE-2026-41178 is a medium-severity denial of service vulnerability in open-telemetry go.opentelemetry.io/otel/baggage, published on 4 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41178 exists.
Affected packages and fixed versions:
- go.opentelemetry.io/otel/baggage (Go): affected from 1.41.0; fixed in 1.42.0
- go.opentelemetry.io/otel/baggage (Go): affected from 1.41.0; fixed in 1.42.0
- go.opentelemetry.io/otel/baggage (Go): affected from 1.43.0; fixed in 1.44.0
- go.opentelemetry.io/otel/baggage (Go): affected from 1.43.0; fixed in 1.44.0
- go.opentelemetry.io/otel (Go): affected from 1.41.0; fixed in 1.42.0, 1.44.0
- go.opentelemetry.io/otel/propagation (Go): affected from 1.41.0; fixed in 1.42.0
- go.opentelemetry.io/otel/propagation (Go): affected from 1.41.0; fixed in 1.42.0
- go.opentelemetry.io/otel/propagation (Go): affected from 1.43.0; fixed in 1.44.0
- go.opentelemetry.io/otel/propagation (Go): affected from 1.43.0; fixed in 1.44.0
Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.
Reference: https://insights.sbomify.com/CVE-2026-41178/ (Markdown: https://insights.sbomify.com/CVE-2026-41178/index.md)
Attackers can cause denial of service by sending oversized baggage headers to applications using the affected OpenTelemetry-Go library.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41178?
CVE-2026-41178 is a medium-severity denial of service vulnerability in open-telemetry go.opentelemetry.io/otel/baggage, published on 4 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
OpenTelemetry-Go is the Go implementation of OpenTelemetry. Versions 1.41.0 and 1.43.0 removed raw-length rejection and it causes `Parse` to process arbitrarily large/invalid baggage headers and log errors, enabling DoS via oversized inputs. Versions 1.42.0 and 1.44.0 fix the issue.
Weakness: CWE-789
Which versions are affected by CVE-2026-41178?
9 open source packages ship an affected version, including go.opentelemetry.io/otel/baggage, go.opentelemetry.io/otel and go.opentelemetry.io/otel/propagation. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
go.opentelemetry.io/otel/baggage Go | From 1.41.0 | 1.42.0 |
go.opentelemetry.io/otel/baggage Go | From 1.41.0 | 1.42.0 |
go.opentelemetry.io/otel/baggage Go | From 1.43.0 | 1.44.0 |
go.opentelemetry.io/otel/baggage Go | From 1.43.0 | 1.44.0 |
go.opentelemetry.io/otel Go | From 1.41.0 | 1.42.0, 1.44.0 |
go.opentelemetry.io/otel/propagation Go | From 1.41.0 | 1.42.0 |
3 more packages
go.opentelemetry.io/otel/propagation Go | From 1.41.0 | 1.42.0 |
go.opentelemetry.io/otel/propagation Go | From 1.43.0 | 1.44.0 |
go.opentelemetry.io/otel/propagation Go | From 1.43.0 | 1.44.0 |
Linux distribution packages (30)
openshift Red Hat:openshift:4.22::el8 | All versions | 0:4.22.0-202609141614.p2.g160626b.assembly.stream.el8 |
openshift-hyperkube Red Hat:openshift:4.22::el8 | All versions | 0:4.22.0-202609141614.p2.g160626b.assembly.stream.el8 |
openshift Red Hat:openshift:4.22::el9 | All versions | 0:4.22.0-202609141614.p2.g160626b.assembly.stream.el9 |
openshift-hyperkube Red Hat:openshift:4.22::el9 | All versions | 0:4.22.0-202609141614.p2.g160626b.assembly.stream.el9 |
openshift-kube-apiserver Red Hat:openshift:4.22::el9 | All versions | 0:4.22.0-202609141614.p2.g160626b.assembly.stream.el9 |
openshift-kube-controller-manager Red Hat:openshift:4.22::el9 | All versions | 0:4.22.0-202609141614.p2.g160626b.assembly.stream.el9 |
openshift-kube-scheduler Red Hat:openshift:4.22::el9 | All versions | 0:4.22.0-202609141614.p2.g160626b.assembly.stream.el9 |
openshift-kubelet Red Hat:openshift:4.22::el9 | All versions | 0:4.22.0-202609141614.p2.g160626b.assembly.stream.el9 |
apptainer SUSE:Linux Enterprise Module for HPC 15 SP7 | All versions | 1.5.3-150600.4.40.1 |
apptainer SUSE:Linux Enterprise Module for Package Hub 15 SP7 | All versions | 1.5.3-150600.4.40.1 |
google-cloud-sap-agent SUSE:Linux Enterprise Module for Public Cloud 12 | All versions | 3.15-6.78.1 |
google-cloud-sap-agent SUSE:Linux Enterprise Server 16.0 | All versions | 3.15-160000.3.1 |
google-cloud-sap-agent SUSE:Linux Enterprise Server for SAP applications 16.0 | All versions | 3.15-160000.3.1 |
apptainer openSUSE:Leap 16.0 | All versions | 1.5.3-bp160.3.1 |
coredns openSUSE:Leap 16.0 | All versions | 1.14.7-bp160.1.1 |
google-cloud-sap-agent openSUSE:Leap 16.0 | All versions | 3.15-160000.3.1 |
amazon-cloudwatch-agent openSUSE:Tumbleweed | All versions | 1.300071.0-2.1 |
apptainer openSUSE:Tumbleweed | All versions | 1.5.3-3.1 |
azure-storage-azcopy openSUSE:Tumbleweed | All versions | 10.32.7-1.1 |
buildpacks-cli openSUSE:Tumbleweed | All versions | 0.40.9-1.1 |
cadvisor openSUSE:Tumbleweed | All versions | 0.60.5-2.1 |
coredns openSUSE:Tumbleweed | All versions | 1.14.7-1.1 |
distribution openSUSE:Tumbleweed | All versions | 3.1.1-5.1 |
google-osconfig-agent openSUSE:Tumbleweed | All versions | 20260918.01-1.1 |
helm openSUSE:Tumbleweed | All versions | 4.2.4-1.1 |
helm3 openSUSE:Tumbleweed | All versions | 3.21.3-6.1 |
helmsman openSUSE:Tumbleweed | All versions | 4.0.5-1.1 |
kubernetes1.34 openSUSE:Tumbleweed | All versions | 1.34.11-2.1 |
kubernetes1.35 openSUSE:Tumbleweed | All versions | 1.35.8-2.1 |
kubernetes1.36 openSUSE:Tumbleweed | All versions | 1.36.4-2.1 |
Products include Opentelemetry Opentelemetry.
How do I fix CVE-2026-41178?
Upgrade go.opentelemetry.io/otel/baggage to a fixed version for your release line: 1.42.0 or 1.44.0.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-41178 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-41178 exists.
Other vulnerabilities in open-telemetry go.opentelemetry.io/otel/baggage
- CVE-2026-29181 OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)
- CVE-2023-47108 DoS vulnerability in otelgrpc (uncontrolled resource consumption) due to unbound cardinality metrics
- CVE-2023-45142 OpenTelemetry-Go Contrib has DoS vulnerability in otelhttp due to unbound cardinality metrics
- CVE-2023-43810 opentelemetry-instrumentation Denial of Service vulnerability due to unbound cardinality metrics
- CVE-2026-39883 opentelemetry-go: BSD kenv command not using absolute path enables PATH hijacking
Sources
Also known as CLEANSTART-2026-DD18561, CLEANSTART-2026-EC67398, CLEANSTART-2026-FG42108, CLEANSTART-2026-FN36797, CLEANSTART-2026-KF71007, CLEANSTART-2026-LN60743 and 1033 more.