CVE-2026-25542

Tekton Pipelines: VerificationPolicy regex pattern bypass via substring matching

MEDIUM

6.5

CVSS Score

Published: April 21, 2026 at 04:05 PM UTC

Updated: October 26, 2026 at 10:10 PM UTC

2 products affected across 2 vendorsTekton PipelinesPipeline

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Severity

MEDIUM6.5

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. From 0.43.0 to 1.11.0, trusted resources verification policies match a resource source string (refSource.URI) against spec.resources[].pattern using regexp.MatchString. In Go, regexp.MatchString reports a match if the pattern matches anywhere in the string, so common unanchored patterns (including examples in tekton documentation) can be bypassed by attacker-controlled source strings that contain the trusted pattern as a substring. This can cause an unintended policy match and change which verification mode/keys apply.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Tekton Pipelines · Linuxfoundationgo

95%

0.43.0 ≤ v < 1.11.0

Pipeline · Tektoncdgo

90%

0.43.0 ≤ v < 1.0.21.10.0 ≤ v < 1.11.11.2.0 ≤ v < 1.3.41.4.0 ≤ v < 1.6.21.7.0 ≤ v < 1.9.3

Affected range stops below 1.0.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.11.1, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.3.4, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.6.2, so it looks safe — our inference, not a vendor statement

Affected range stops below 1.9.3, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_CONFIRMExploitVendor Advisory

Source: cverecord

https://github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr

x_refsource_MISCPatch

Source: cverecord

https://github.com/tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207362a

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMGitHub_M

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: NONE
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-185

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