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High, CVSS 7.5

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

CVE-2026-40938GHSA-94jr-7pqp-xhcq

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (github.com/tektoncd/pipeline 1.11.1, 1.9.3, 1.6.2, 1.3.4, 1.0.2), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • Go github.com/tektoncd/pipeline

    Affected
    >= 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
    Fixed in
    1.0.2, 1.11.1, 1.9.3, 1.6.2, 1.3.4

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
  • CVE-2026-40938: 0.79% estimated exploitation activity in the next 30 days; percentile 56.23 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

Summary 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. Details Root Cause 1 — Unvalidated revision parameter passed to git fetch pkg/resolution/resolver/git/repository.go:85: execGit invokes exec.CommandContext("git", ...) — no shell is used, so shell metacharacters cannot be injected. However, git itself parses flags…

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 1 · created ·

    Published from ghsa record GHSA-94jr-7pqp-xhcq

Agent brief

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# Patch Next advisory brief: CVE-2026-40938

Advisory: Tekton Pipeline: Git Resolver Unsanitized Revision Parameter Enables git Argument Injection Leading to RCE
IDs: CVE-2026-40938, GHSA-94jr-7pqp-xhcq
Record: https://patchnext.com/advisories/cve-2026-40938 (revision 1, source checked 26 Oct 2026, 15:27 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/tektoncd/pipeline 1.11.1, 1.9.3, 1.6.2, 1.3.4, 1.0.2. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/tektoncd/pipeline: affected >= 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; fixed in 1.0.2, 1.11.1, 1.9.3, 1.6.2, 1.3.4

## Suggested inspection (read-only)
- Go github.com/tektoncd/pipeline: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/tektoncd/pipeline.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-94jr-7pqp-xhcq (GitHub-reviewed advisory GHSA-94jr-7pqp-xhcq lists affected ranges: Go github.com/tektoncd/pipeline >=1.10.0 =1.7.0 =1.4.0 =1.2.0 =1.0.0 <1.0.2)

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