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Fencer Intel
high 8.5

CVE-2026-40938 json

Tekton Pipelines: Git Resolver Unsanitized Revision Parameter Enables git Argument Injection Leading to RCE

published 6mo ago modified 14d ago also EUVD-2026-24491 , GHSA-94jr-7pqp-xhcq , GO-2026-5272

cvss
8.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

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 git resolver's revision parameter is passed directly as a positional argument to git fetch without any validation that it does not begin with a - character. Because git parses flags from mixed positional arguments, an attacker can inject arbitrary git fetch flags such as --upload-pack=<binary>. Combined with the validateRepoURL function explicitly permitting URLs that begin with / (local filesystem paths), a tenant who can submit ResolutionRequest objects can chain these two behaviors to execute an arbitrary binary on the resolver pod. The tekton-pipelines-resolvers ServiceAccount holds cluster-wide get/list/watch on all Secrets, so code execution on the resolver pod enables full cluster-wide secret exfiltration. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.

Patch / fix

  • go github.com/tektoncd/pipeline 1.0.2, 1.3.4, 1.6.2, 1.9.3, 1.11.1
  • Red Hat Red Hat OpenShift Builds 1.7.3 1780373835, 1780373846, 1780373867, 1780374084, 1780374151, 1780374228, 1780480839
  • Red Hat Red Hat OpenShift Builds 1.8.1 1778682920, 1778682930, 1778682932, 1778683134, 1778683229, 1778683436
  • Red Hat Red Hat OpenShift Pipelines 1.21 1780645012, 1781686494, cli-1.21.1
  • govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1

opensuse advisories openSUSE-SU-2026:21483-1

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-40938 updated cvss 8.5

github.com/tektoncd/pipeline: Tekton Pipelines: Arbitrary code execution and secret exfiltration via malicious git commands

  • Red Hat OpenShift Pipelines openshift-pipelines/pipelines-nop-rhel9, openshift-pipelines/pipelines-opc-rhel9, openshift-pipelines/pipelines-events-rhel9, openshift-pipelines/pipelines-cli-tkn-rhel9, openshift-pipelines/pipelines-hub-api-rhel9, openshift-pipelines/pipelines-webhook-rhel9, +22 more
    affected: workaround, no fix available
  • Red Hat OpenShift Builds 1.7.3 openshift-builds/openshift-builds-waiters-rhel9 1780374228, openshift-builds/openshift-builds-webhook-rhel9 1780374084, openshift-builds/openshift-builds-rhel9-operator 1780480839, openshift-builds/openshift-builds-controller-rhel9 1780373846, openshift-builds/openshift-builds-git-cloner-rhel9 1780374151, openshift-builds/openshift-builds-image-bundler-rhel9 1780373867, +1 more
    fixed: fixed in 1.7.3 RHSA-2026:24359
  • Red Hat OpenShift Builds 1.8.3 openshift-builds 1778682920, openshift-builds 1778682930, openshift-builds 1778682932, openshift-builds 1778683134, openshift-builds 1778683229, openshift-builds 1778683436
    fixed: fixed in 1.8.0 RHSA-2026:17546
  • Red Hat OpenShift Builds 1.9.2 openshift-builds/openshift-builds-operator-bundle 1792762900, openshift-builds/openshift-builds-rhel10-operator 1792749358, openshift-builds/openshift-builds-rhel10-operator 1792859629
    fixed: fixed in 1.9.2 RHSA-2026:89041
  • Red Hat OpenShift Pipelines 1.21 serve-tkn-cli-1-21-serve-tkn-cli 1.21.1, openshift-pipelines/pipelines-rhel9-operator 1780645012, openshift-pipelines/pipelines-operator-bundle 1781686494
    fixed: vendor fix RHSA-2026:26538
  • Red Hat OpenShift Lightspeed openshift-lightspeed/openshift-mcp-server-rhel9 Red Hat OpenShift Pipelines openshift-pipelines/pipelines-nop-rhel8, openshift-pipelines/pipelines-events-rhel8, openshift-pipelines/pipelines-cli-tkn-rhel8, openshift-pipelines/pipelines-hub-api-rhel8, openshift-pipelines/pipelines-webhook-rhel8, openshift-pipelines/pipelines-git-init-rhel8, +20 more Red Hat OpenShift Serverless openshift-serverless-1/kn-client-kn-rhel9, openshift-serverless-1/kn-plugin-func-func-util-rhel9 Red Hat OpenShift AI (RHOAI) rhoai/odh-ml-pipelines-driver-rhel8, rhoai/odh-ml-pipelines-launcher-rhel8, rhoai/odh-ml-pipelines-api-server-v2-rhel8, rhoai/odh-ml-pipelines-persistenceagent-v2-rhel8, rhoai/odh-ml-pipelines-scheduledworkflow-v2-rhel8 Red Hat OpenShift Builds 1.7.3 openshift-builds/openshift-builds-operator-bundle 1780485589, openshift-builds/openshift-builds-shared-resource-rhel9 1780477299, openshift-builds/openshift-builds-shared-resource-webhook-rhel9 1780477295 Red Hat OpenShift Builds 1.8.3 openshift-builds 1778671008, openshift-builds 1778671009, openshift-builds 1778674829, openshift-builds 1778684489
    +4 more products
    Red Hat OpenShift Builds 1.9.2 openshift-builds/openshift-builds-waiters-rhel10 1792762119, openshift-builds/openshift-builds-waiters-rhel10 1792839475, openshift-builds/openshift-builds-webhook-rhel10 1792680944, openshift-builds/openshift-builds-webhook-rhel10 1792835571, openshift-builds/openshift-builds-operator-bundle 1792863311, openshift-builds/openshift-builds-controller-rhel10 1792680723, +11 more Red Hat OpenShift Pipelines 1.21 openshift-pipelines/pipelines-nop-rhel9 1780984035, openshift-pipelines/pipelines-opc-rhel9 1780572821, openshift-pipelines/pipelines-cache-rhel9 1780402306, openshift-pipelines/pipelines-events-rhel9 1780983714, openshift-pipelines/pipelines-hub-ui-rhel9 1780633047, openshift-pipelines/pipelines-cli-tkn-rhel9 1780922870, +30 more Red Hat OpenShift Virtualization 4 container-native-virtualization/kubevirt-ssp-operator-rhel9, container-native-virtualization/kubevirt-template-validator-rhel9, container-native-virtualization/kubevirt-tekton-tasks-create-datavolume-rhel9, container-native-virtualization/kubevirt-tekton-tasks-disk-virt-customize-rhel9 Red Hat Trusted Artifact Signer rhtas/ec-rhel9
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
total
Assessed
6mo ago

Exploit prediction

0.79% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/tektoncd/pipeline/security/advisories/GHSA-94jr-7pqp-xhcq referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CISA ADP 3.1 8.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
NVD 3.1 8.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CNA 3.1 8.5 CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H

Affected packages

ecosystem package affected fixed in
go github.com/tektoncd/pipeline
>=1.10.0, <1.11.1
>=1.7.0, <1.9.3
>=1.4.0, <1.6.2
>=1.2.0, <1.3.4
>=1.0.0, <1.0.2
>=1.1.0, <1.3.4
1.11.1
1.9.3
1.6.2
1.3.4
1.0.2

Affected products

  • tektoncd pipeline
  • Red Hat Red Hat OpenShift Builds 1.7.3
  • Red Hat Red Hat OpenShift Builds 1.8.1
  • Red Hat Red Hat OpenShift Pipelines 1.21
  • Red Hat OpenShift Lightspeed
  • Red Hat OpenShift Pipelines
  • Red Hat OpenShift Serverless
  • Red Hat Red Hat OpenShift AI (RHOAI)
  • Red Hat Red Hat OpenShift Virtualization 4
  • Red Hat Red Hat Trusted Artifact Signer

Classification

Weakness
  • CWE-88 Improper Neutralization of Argument Delimiters in a Command

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.