CVE-2026-40924
Tekton Pipelines: HTTP Resolver Unbounded Response Body Read Enables Denial of Service via Memory Exhaustion
Description
Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Prior to 1.11.1, the HTTP resolver's FetchHttpResource function calls io.ReadAll(resp.Body) with no response body size limit. Any tenant with permission to create TaskRuns or PipelineRuns that reference the HTTP resolver can point it at an attacker-controlled HTTP server that returns a very large response body within the 1-minute timeout window, causing the tekton-pipelines-resolvers pod to be OOM-killed by Kubernetes. Because all resolver types (Git, Hub, Bundle, Cluster, HTTP) run in the same pod, crashing this pod denies resolution service to the entire cluster. Repeated exploitation causes a sustained crash loop. The same vulnerable code path is reached by both the deprecated pkg/resolution/resolver/http and the current pkg/remoteresolution/resolver/http implementations. This vulnerability is fixed in 1.11.1.
INFO
Published Date :
April 21, 2026, 9:16 p.m.
Last Modified :
April 27, 2026, 6:06 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Tekton Pipelines to version 1.11.1 or later.
- Ensure TaskRuns and PipelineRuns do not reference attacker-controlled HTTP servers.
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-2026-40924.
| URL | Resource |
|---|---|
| https://github.com/tektoncd/pipeline/releases/tag/v1.11.1 | Release Notes |
| https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74 | Exploit Vendor Advisory |
| https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74 | Exploit Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40924 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-2026-40924
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).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40924 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-40924 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.
-
Initial Analysis by [email protected]
Apr. 27, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:linuxfoundation:tekton_pipelines:*:*:*:*:*:go:*:* versions up to (excluding) 1.11.1 Added Reference Type GitHub, Inc.: https://github.com/tektoncd/pipeline/releases/tag/v1.11.1 Types: Release Notes Added Reference Type CISA-ADP: https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74 Types: Exploit, Vendor Advisory Added Reference Type GitHub, Inc.: https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74 Types: Exploit, Vendor Advisory -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Apr. 22, 2026
Action Type Old Value New Value Added Reference https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74 -
New CVE Received by [email protected]
Apr. 21, 2026
Action Type Old Value New Value Added Description Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Prior to 1.11.1, the HTTP resolver's FetchHttpResource function calls io.ReadAll(resp.Body) with no response body size limit. Any tenant with permission to create TaskRuns or PipelineRuns that reference the HTTP resolver can point it at an attacker-controlled HTTP server that returns a very large response body within the 1-minute timeout window, causing the tekton-pipelines-resolvers pod to be OOM-killed by Kubernetes. Because all resolver types (Git, Hub, Bundle, Cluster, HTTP) run in the same pod, crashing this pod denies resolution service to the entire cluster. Repeated exploitation causes a sustained crash loop. The same vulnerable code path is reached by both the deprecated pkg/resolution/resolver/http and the current pkg/remoteresolution/resolver/http implementations. This vulnerability is fixed in 1.11.1. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H Added CWE CWE-400 Added Reference https://github.com/tektoncd/pipeline/releases/tag/v1.11.1 Added Reference https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74