CVE-2026-25542

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.

CVSS v3.1 Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

EPSS — Exploit Prediction

0.0003

Probability of exploitation

0.10%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-185 CWE-185

Affected Products

Vendor	Product	Versions
linuxfoundation	tekton_pipelines	0.43.0 — 1.11.0

References

Advisories & Patches

https://github.com/tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207362a https://github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr

Exploits

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

Frequently Asked Questions

What is CVE-2026-25542? +

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. It has a CVSS v3.1 base score of 6.5 (MEDIUM).

How severe is CVE-2026-25542? +

CVE-2026-25542 has a CVSS v3.1 score of 6.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0003, placing it in the 0th percentile for exploitation probability.

What products are affected by CVE-2026-25542? +

CVE-2026-25542 affects products from linuxfoundation, specifically: tekton_pipelines. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2026-25542? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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