CVE-2026-40923Public exploitNetwork attack vector

Authenticated internal-state tampering via unnormalized mount paths

Published Apr 21, 2026 · Updated Apr 21, 2026

Path traversal in Tekton Pipelines allows remote authenticated users to read or alter internal execution state through crafted volume mounts. The v1 and v1beta1 validators compare the raw mountPath with strings.HasPrefix without cleaning dot-dot components, so an allowed /tekton/home prefix resolves into a restricted /tekton path at runtime. Task or TaskRun creation permission is required; exploitation can forge trusted results, expose or modify step scripts, or disrupt entrypoint coordination.

CVSS severity5.4
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Path traversal in Tekton Pipelines allows remote authenticated users to read or alter internal execution state through crafted volume mounts. The v1 and v1beta1 validators compare the raw mountPath with strings.HasPrefix without cleaning dot-dot components, so an allowed /tekton/home prefix resolves into a restricted /tekton path at runtime. Task or TaskRun creation permission is required; exploitation can forge trusted results, expose or modify step scripts, or disrupt entrypoint coordination.

The record

CVE
CVE-2026-40923
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
Tekton
Product
Tekton Pipelines
Classifications
CWE-22, T1565.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Tekton · Tekton Pipelinesversion=< 1.11.1

Published CVSS scores

5.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1565.001Stored Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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