High severity · published Apr 7, 2026
CVE-2026-29181
OpenTelemetry-Go multi-value `baggage` header extraction causes excessive allocations (remote dos amplification)
7.5
CVSS
0.8%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.8% · higher than 56% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
OP
opentelemetry-go · open-telemetry
>= 1.36.0, < 1.41.0 · source: vendor
OP
Opentelemetry · Opentelemetry
1.36.0 before 1.41.0 · source: NVD
CM
Cert Manager support for Red Hat OpenShift release 1.19 · Red Hat
All versions, or not specified · source: CISA
CO
Cluster Observability Operator 1.5.0 · Red Hat
All versions, or not specified · source: CISA
LS
Logging Subsystem for Red Hat OpenShift 6.6 · Red Hat
All versions, or not specified · source: CISA
ME
Multicluster Engine for Kubernetes · Red Hat
All versions, or not specified · source: CISA
RH
Red Hat Advanced Cluster Management for Kubernetes 2 · Red Hat
All versions, or not specified · source: CISA
CO
cert-manager Operator for Red Hat OpenShift · Red Hat
All versions, or not specified · source: CISA
ME
multicluster engine for Kubernetes 2.11 · Red Hat
All versions, or not specified · source: CISA
ME
multicluster engine for Kubernetes 2.8 · Red Hat
All versions, or not specified · source: CISA
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-29181
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-29181
Exploit
https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-mh2q-q3fh-2475
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:25271
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:47735
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:61314
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:63140
access.redhat.com
https://access.redhat.com/errata/RHSA-2026:66521
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