CVE-2026-29181
OpenTelemetry-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.
INFO
Published Date :
April 7, 2026, 9:17 p.m.
Last Modified :
July 24, 2026, 11:10 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-29181
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 3.1 | HIGH | 0b0ca135-0b70-47e7-9f44-1890c2a1c46c |
Solution
- Update OpenTelemetry-Go to 1.41.0 or later.
- Monitor resource utilization after update.
- Review baggage header processing logic.
- Implement stricter header value limits.
Public PoC/Exploit Available at Github
CVE-2026-29181 has a 4 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-29181.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-29181 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-29181
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
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Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-29181 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-29181 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Translated by [email protected]
Jul. 24, 2026
Action Type Old Value New Value Added Translation Title: opentelemetry-go de open-telemetry, Description: OpenTelemetry-Go es la implementación en Go de OpenTelemetry. Desde la versión 1.36.0 hasta la 1.40.0, la extracción de encabezados 'baggage' con múltiples valores analiza cada par campo-valor del encabezado de forma independiente y agrega los miembros a través de los valores. Esto permite a un atacante amplificar el uso de CPU y las asignaciones de memoria enviando muchas líneas de encabezado 'baggage', incluso cuando cada valor individual está dentro del límite de análisis de 8192 bytes por valor. Esta vulnerabilidad está corregida en la versión 1.41.0. -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 20, 2026
Action Type Old Value New Value Changed Affected [{'cpes': ['cpe:/a:redhat:multicluster_engine:2.11::el9'], 'vendor': 'Red Hat', 'product': 'multicluster engine for Kubernetes 2.11', 'versions': [{'status': 'unaffected', 'version': '1780917881', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'multicluster-engine/hypershift-addon-rhel9-operator', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/assisted-service-9-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unknown'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/managedcluster-import-controller-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/multicloud-manager-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/placement-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/registration-operator-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/registration-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/work-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:acm:2'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2', 'packageName': 'rhacm2/multicluster-observability-rhel9-operator', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unknown'}] [{'cpes': ['cpe:/a:redhat:multicluster_engine:2.11::el9'], 'vendor': 'Red Hat', 'product': 'multicluster engine for Kubernetes 2.11.0', 'versions': [{'status': 'unaffected', 'version': '1780917881', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'multicluster-engine/hypershift-addon-rhel9-operator', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/assisted-service-9-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unknown'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/managedcluster-import-controller-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/multicloud-manager-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/placement-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/registration-operator-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/registration-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/work-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:acm:2'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2', 'packageName': 'rhacm2/multicluster-observability-rhel9-operator', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unknown'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jul. 15, 2026
Action Type Old Value New Value Changed Affected [{'cpes': ['cpe:/a:redhat:multicluster_engine:2.11::el9'], 'vendor': 'Red Hat', 'product': 'multicluster engine for Kubernetes 2.11', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'defaultStatus': 'affected'}] [{'cpes': ['cpe:/a:redhat:multicluster_engine:2.11::el9'], 'vendor': 'Red Hat', 'product': 'multicluster engine for Kubernetes 2.11', 'versions': [{'status': 'unaffected', 'version': '1780917881', 'lessThan': '*', 'versionType': 'rpm'}], 'packageName': 'multicluster-engine/hypershift-addon-rhel9-operator', 'collectionURL': 'https://catalog.redhat.com/software/containers/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/assisted-service-9-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unknown'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/managedcluster-import-controller-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/multicloud-manager-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/placement-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/registration-operator-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/registration-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'packageName': 'multicluster-engine/work-rhel9', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:acm:2'], 'vendor': 'Red Hat', 'product': 'Red Hat Advanced Cluster Management for Kubernetes 2', 'packageName': 'rhacm2/multicluster-observability-rhel9-operator', 'collectionURL': 'https://access.redhat.com/downloads/content/package-browser/', 'defaultStatus': 'unknown'}] -
CVE Modified by 0b0ca135-0b70-47e7-9f44-1890c2a1c46c
Jun. 30, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:/a:redhat:multicluster_engine:2.11::el9'], 'vendor': 'Red Hat', 'product': 'multicluster engine for Kubernetes 2.11', 'defaultStatus': 'affected'}, {'cpes': ['cpe:/a:redhat:multicluster_engine'], 'vendor': 'Red Hat', 'product': 'Multicluster Engine for Kubernetes', 'defaultStatus': 'affected'}] Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-770 Added Reference https://access.redhat.com/errata/RHSA-2026:25271 Added Reference https://access.redhat.com/security/cve/CVE-2026-29181 Added Reference https://bugzilla.redhat.com/show_bug.cgi?id=2456252 Added Reference https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-29181.json -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-29181', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'yes'}, {'technicalImpact': 'partial'}], 'version': '2.0.3', 'timestamp': '2026-04-08T15:36:53.783712Z'} -
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'open-telemetry', 'product': 'opentelemetry-go', 'versions': [{'status': 'affected', 'version': '>= 1.36.0, < 1.41.0'}]}] -
Initial Analysis by [email protected]
Apr. 14, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:opentelemetry:opentelemetry:*:*:*:*:*:go:*:* versions from (including) 1.36.0 up to (excluding) 1.41.0 Added Reference Type GitHub, Inc.: https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-mh2q-q3fh-2475 Types: Exploit, Vendor Advisory -
New CVE Received by [email protected]
Apr. 07, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-770 Added Reference https://github.com/open-telemetry/opentelemetry-go/security/advisories/GHSA-mh2q-q3fh-2475