CVE-2026-25542
Description
A flaw was found in Tekton Pipelines. An attacker can bypass trusted resource verification policies by crafting a malicious source string that contains a trusted pattern as a substring. This is due to the regexp.MatchString function in Go matching patterns anywhere within a string, rather than requiring an exact match. This vulnerability can lead to unintended policy matches, allowing an attacker to alter verification modes or keys and potentially compromise the integrity of Continuous Integration/Continuous Delivery (CI/CD) pipelines.
Statement
A Moderate security bypass flaw exists in Tekton Pipelines, impacting Red Hat products utilizing Tekton for CI/CD operations. An attacker can bypass trusted resource verification policies by crafting a malicious source string that exploits the regexp.MatchString function's behavior of matching patterns anywhere within a string. This can lead to unintended policy matches, potentially compromising the integrity of CI/CD pipelines in affected OpenShift Virtualization, Konflux, OpenShift Builds, Hosted OpenShift Clusters, OpenShift Pipelines, Red Hat OpenShift AI, Red Hat Trusted Artifact Signer, and OpenShift Serverless deployments.
Mitigation
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 6.5 | N/A | 6.5 |
| Attack Vector | Network | N/A | Network |
| Attack Complexity | Low | N/A | Low |
| Privileges Required | Low | N/A | Low |
| User Interaction | None | N/A | None |
| Scope | Unchanged | N/A | Unchanged |
| Confidentiality | None | N/A | None |
| Integrity Impact | High | N/A | High |
| Availability Impact | None | N/A | None |
Vector
Red Hat: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
cve.org: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Understanding the Weakness (CWE)
Access Control
Technical Impact: Bypass Protection Mechanism
Frequently Asked Questions
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