# CVE-2026-40924: Tekton Pipelines DoS via unbounded memory allocation in HTTP resolver

Source: https://junglewise.ai/threats/cve-2026-40924-tekton-pipelines-dos-via-unbounded-memory-allocation-in-http  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-04-21. Updated: 2026-05-22  
License: CC BY 4.0 with a link back

CVE-2026-40924 · Severity: medium · CVSS 6.5 · Published 2026-04-21

Tekton Pipelines is a framework for creating continuous integration and delivery (CI/CD) systems on Kubernetes. A vulnerability in the component that fetches remote resources via HTTP allows a user with basic permissions to crash the entire resolution service for the cluster. By pointing the system at a malicious server that sends a massive amount of data, an attacker can exhaust the system's memory, causing a denial-of-service that prevents all users from running their pipelines.

Technologies: [github.com/tektoncd/pipeline (Go)](https://junglewise.ai/threats/technologies/github-com-tektoncd-pipeline), [Linuxfoundation Tekton Pipelines](https://junglewise.ai/threats/technologies/tekton-pipelines), [Tekton Pipelines](https://junglewise.ai/threats/technologies/pipelines). Vendors: [Go](https://junglewise.ai/threats/vendors/go), [Linuxfoundation](https://junglewise.ai/threats/vendors/linuxfoundation), [Tekton](https://junglewise.ai/threats/vendors/tekton).

## Quick answers

**Is CVE-2026-40924 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-40924 being exploited in the wild.

**How severe is CVE-2026-40924?** Medium severity, with a CVSS score of 6.5, published 21 April 2026.

**Which products and versions are affected?** github.com/tektoncd/pipeline (Go) <= 1.11.0, SEMVER:introduced=1.0.0,fixed=1.0.2,introduced=1.1.0,fixed=1.3.4,introduced=1.4.0,fixed=1.6.2,introduced=1.7.0,fixed=1.9.3,introduced=1.10.0,fixed=1.11.1, SEMVER:introduced=1.10.0,fixed=1.11.1; Tekton Pipelines >= 1.10.0, < 1.11.1; >= 1.0.0, < 1.0.2; >= 1.2.0, < 1.3.4; >= 1.4.0, < 1.6.2; >= 1.7.0, < 1.9.3.

**Is there a fix for CVE-2026-40924?** Yes. github.com/tektoncd/pipeline (Go): upgrade to 1.11.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-40924 attacked?** It is attacked over the network, in a software library.

**Am I affected by CVE-2026-40924?** Check whether you run github.com/tektoncd/pipeline (Go), Linuxfoundation Tekton Pipelines or Tekton Pipelines at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- github.com/tektoncd/pipeline (Go): upgrade to 1.11.1 or later

  ```sh
  go get github.com/tektoncd/pipeline@v1.11.1
  ```


## Technical details

The vulnerability exists in the HTTP resolver's FetchHttpResource function, which uses io.ReadAll(resp.Body) without a size limit. An attacker with 'create' permissions for TaskRuns or PipelineRuns can specify a URL pointing to a malicious HTTP server. If this server returns a response body larger than the memory limit of the tekton-pipelines-resolvers pod (typically 4 GiB) within the 1-minute request timeout, the pod will be OOM-killed by Kubernetes. Because all resolver types (Git, Hub, Bundle, Cluster, HTTP) share the same pod, this results in a cluster-wide denial of service for resource resolution. The issue is fixed in versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 by implementing a 1 MiB response body limit.

## Affected products

- Tekton CD Tekton Pipelines >= 1.0.0, < 1.0.2; >= 1.1.0, < 1.3.4; >= 1.4.0, < 1.6.2; >= 1.7.0, < 1.9.3; >= 1.10.0, < 1.11.1

## Identifiers

- CVE-2026-40924
- GHSA-m2cx-gpqf-qf74
- GO-2026-5486

## Timeline

- 2026-04-21: disclosed
- 2026-04-21: patched
- 2026-04-21: advisory

## References

- [https://github.com/tektoncd/pipeline/releases/tag/v1.11.1](https://github.com/tektoncd/pipeline/releases/tag/v1.11.1)
- [https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74](https://github.com/tektoncd/pipeline/security/advisories/GHSA-m2cx-gpqf-qf74)

## Related threats

- [Tekton Pipelines argument injection in Git resolver revision parameter](https://junglewise.ai/threats/cve-2026-40938-tekton-pipelines-argument-injection-in-git-resolver-revision)
- [Tekton Pipelines path traversal in VolumeMount validation](https://junglewise.ai/threats/cve-2026-40923-tekton-pipelines-path-traversal-in-volumemount-validation)
- [Tekton Pipelines credential exfiltration in Git resolver API mode](https://junglewise.ai/threats/cve-2026-40161-tekton-pipelines-credential-exfiltration-in-git-resolver-api-mode)
- [Tekton Pipelines regex bypass in trusted resources verification](https://junglewise.ai/threats/cve-2026-25542-tekton-pipelines-regex-bypass-in-trusted-resources-verification)
- [Tekton Pipelines path traversal in git resolver](https://junglewise.ai/threats/cve-2026-33211-tekton-pipelines-path-traversal-in-git-resolver)