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TI-2026-29578 Aliases CVE-2026-40924GHSA-m2cx-gpqf-qf74

Tekton Pipelines: HTTP Resolver Unbounded Response Body Read Enables Denial of Service via Memory Exhaustion

Priority MEDIUM 62CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
Low
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
Partial Red Hat: 7 without a fix

Attack profile from CVSS 3.1 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-400.

Summary

Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 1.0.0 and prior to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 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. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00318 24th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Partial pipeline (tektoncd): 1.0.2, 1.3.4, 1.6.2 +2github.com/tektoncd/pipeline (Go): 1.11.1, 1.0.2, 1.3.4 +2Red Hat: 7 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
backstagepipeline1.0.0 to before 1.0.2; 1.2.0 to before 1.3.4; 1.4.0 to before 1.6.2; 1.7.0 to before 1.9.3; 1.10.0 to before 1.11.11.0.2, 1.3.4, 1.6.2, 1.9.3, 1.11.1Patch availableCNA
—github.com/tektoncd/pipeline (Go)1.10.0 to before 1.11.11.11.1Patch availableGHSA-m2cx-gpqf-qf74
—github.com/tektoncd/pipeline (Go)1.0.0 to before 1.0.21.0.2Patch availableGHSA-m2cx-gpqf-qf74
—github.com/tektoncd/pipeline (Go)1.2.0 to before 1.3.41.3.4Patch availableGHSA-m2cx-gpqf-qf74
—github.com/tektoncd/pipeline (Go)1.4.0 to before 1.6.21.6.2Patch availableGHSA-m2cx-gpqf-qf74
—github.com/tektoncd/pipeline (Go)1.7.0 to before 1.9.31.9.3Patch availableGHSA-m2cx-gpqf-qf74
  • pipeline Vendorbackstage Affected 1.0.0 to before 1.0.2; 1.2.0 to before 1.3.4; 1.4.0 to before 1.6.2; 1.7.0 to before 1.9.3; 1.10.0 to before 1.11.1 Fixed in 1.0.2, 1.3.4, 1.6.2, 1.9.3, 1.11.1 Patch available CNA
  • github.com/tektoncd/pipeline (Go) Vendor— Affected 1.10.0 to before 1.11.1 Fixed in 1.11.1 Patch available GHSA-m2cx-gpqf-qf74
  • github.com/tektoncd/pipeline (Go) Vendor— Affected 1.0.0 to before 1.0.2 Fixed in 1.0.2 Patch available GHSA-m2cx-gpqf-qf74
  • github.com/tektoncd/pipeline (Go) Vendor— Affected 1.2.0 to before 1.3.4 Fixed in 1.3.4 Patch available GHSA-m2cx-gpqf-qf74
  • github.com/tektoncd/pipeline (Go) Vendor— Affected 1.4.0 to before 1.6.2 Fixed in 1.6.2 Patch available GHSA-m2cx-gpqf-qf74
  • github.com/tektoncd/pipeline (Go) Vendor— Affected 1.7.0 to before 1.9.3 Fixed in 1.9.3 Patch available GHSA-m2cx-gpqf-qf74

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:linuxfoundation:tekton_pipelines:*:*:*:*:*:go:*:*before 1.11.1Vulnerablebackstage
  • cpe:2.3:a:linuxfoundation:tekton_pipelines:*:*:*:*:*:go:*:* Versions before 1.11.1 Vulnerable ·backstage

Remediation

  • Fix · CNA pipeline (tektoncd) Fixed in 1.0.2, 1.3.4, 1.6.2, 1.9.3, 1.11.1
  • Fix · GHSA-m2cx-gpqf-qf74 github.com/tektoncd/pipeline (Go) Fixed in 1.11.1 Advisory →
  • Fix · GHSA-m2cx-gpqf-qf74 github.com/tektoncd/pipeline (Go) Fixed in 1.0.2 Advisory →
  • Fix · GHSA-m2cx-gpqf-qf74 github.com/tektoncd/pipeline (Go) Fixed in 1.3.4 Advisory →
  • Fix · GHSA-m2cx-gpqf-qf74 github.com/tektoncd/pipeline (Go) Fixed in 1.6.2 Advisory →
  • Fix · GHSA-m2cx-gpqf-qf74 github.com/tektoncd/pipeline (Go) Fixed in 1.9.3 Advisory →

Vendor assessments

Red Hat

Red Hat rating: Moderate. Red Hat's page for this CVE →

ProductStatusPlan or fix
Builds for Red Hat OpenShiftAffectedNo fix yet: Fix deferred
OpenShift LightspeedAffectedNo fix yet: Fix deferred
OpenShift PipelinesAffectedNo fix yet: Fix deferred
OpenShift ServerlessAffectedNo fix yet: Fix deferred
Red Hat OpenShift AI (RHOAI)AffectedNo fix yet: Fix deferred
Red Hat OpenShift Virtualization 4AffectedNo fix yet: Fix deferred
Red Hat Trusted Artifact SignerAffectedNo fix yet: Fix deferred

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40924
  2. 2026-10-03 Alias added: GHSA-m2cx-gpqf-qf74

References

Exploit 1

Advisory 1

Other 2

  • TI-2026-29590 Tekton Pipelines: Git Resolver Unsanitized Revision Parameter Enables git Argument Injection Leading to RCE CVSS 3.1HIGH 8.5
  • TI-2023-18894 Pipelines do not validate child UIDs CVSS 3.1MEDIUM 4.3
  • TI-2026-25632 Tekton Pipelines git resolver has path traversal that allows reading arbitrary files from the resolver pod CVSS 3.1CRITICAL 9.6
  • TI-2026-28976 Tekton Pipelines: Git resolver API mode leaks system-configured API token to user-controlled serverURL CVSS 3.1HIGH 7.7
  • TI-2026-25468 Tekton Pipelines: Controller can panic when setting long resolver names in TaskRun/PipelineRun CVSS 3.1MEDIUM 6.5
  • TI-2026-20651 Tekton Pipelines: VerificationPolicy regex pattern bypass via substring matching CVSS 3.1MEDIUM 6.5
See all 7 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences