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{"bugzilla": {"description": "github.com/tektoncd/pipeline: Tekton Pipelines: Security bypass due to regular expression matching flaw", "id": "2460159", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460159"}, "csaw": false, "cvss3": {"cvss3_base_score": "6.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N", "status": "draft"}, "cwe": "CWE-625", "details": ["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."], "name": "CVE-2026-25542", "package_state": [{"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-controller-rhel9", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-git-cloner-rhel9", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-image-bundler-rhel9", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-image-processing-rhel9", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-rhel9-operator", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-waiters-rhel9", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_builds:1", "fix_state": "Fix deferred", "package_name": "openshift-builds/openshift-builds-webhook-rhel9", "product_name": "Builds for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:openshift_lightspeed", "fix_state": "Not affected", "package_name": "openshift-lightspeed/openshift-mcp-server-rhel9", "product_name": "OpenShift Lightspeed"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines/pipelines-chains-controller-rhel8", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines/pipelines-chains-controller-rhel9", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines/pipelines-cli-tkn-rhel8", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines/pipelines-cli-tkn-rhel9", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-controller-rhel8", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-controller-rhel9", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-entrypoint-rhel8", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-entrypoint-rhel9", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-events-rhel8", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Not affected", "package_name": "openshift-pipelines/pipelines-events-rhel9", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines/pipelines-git-init-rhel8", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines/pipelines-git-init-rhel9", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines/pipelines-hub-api-rhel8", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines/pipelines-hub-api-rhel9", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines/pipelines-manual-approval-gate-controller-rhel8", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines/pipelines-manual-approval-gate-controller-rhel9", "product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:openshift_pipelines:1", "fix_state": "Fix deferred", "package_name": "openshift-pipelines/pipelines-manual-approval-gate-webhook-rhel8", "product_name": "OpenShift Pipelines"}, {"cpe": 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"product_name": "OpenShift Pipelines"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Fix deferred", "package_name": "openshift-serverless-1/kn-client-kn-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:serverless:1", "fix_state": "Fix deferred", "package_name": "openshift-serverless-1/kn-plugin-func-func-util-rhel9", "product_name": "OpenShift Serverless"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Out of support scope", "package_name": "rhoai/odh-ml-pipelines-api-server-v2-rhel8", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Out of support scope", "package_name": "rhoai/odh-ml-pipelines-driver-rhel8", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Out of support scope", "package_name": "rhoai/odh-ml-pipelines-launcher-rhel8", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Out of support scope", "package_name": "rhoai/odh-ml-pipelines-persistenceagent-v2-rhel8", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:openshift_ai", "fix_state": "Out of support scope", "package_name": "rhoai/odh-ml-pipelines-scheduledworkflow-v2-rhel8", "product_name": "Red Hat OpenShift AI (RHOAI)"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Out of support scope", "package_name": "container-native-virtualization/kubevirt-ssp-operator-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Out of support scope", "package_name": "container-native-virtualization/kubevirt-tekton-tasks-create-datavolume-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Out of support scope", "package_name": "container-native-virtualization/kubevirt-tekton-tasks-disk-virt-customize-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Out of support scope", "package_name": "container-native-virtualization/kubevirt-template-validator-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:trusted_artifact_signer:1", "fix_state": "Out of support scope", "package_name": "rhtas/ec-rhel9", "product_name": "Red Hat Trusted Artifact Signer"}], "public_date": "2026-04-21T16:05:43Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-25542\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-25542\nhttps://github.com/tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207362a\nhttps://github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0.43.0,1.11.0]"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "pipeline", "source": "cna", "vendor": "tektoncd"}, "product": "pipeline", "vendor": "tektoncd"}], "analysis": {"en": {"generated_at": "2026-04-28T21:30:02.771084+00:00", "value": {"mitigation_remediation": ["Upgrade Tekton Pipelines to version 1.12.0 or later, where the pattern matching logic has been corrected to enforce exact matches or proper anchoring.", "If an upgrade is not immediately possible, modify existing VerificationPolicy patterns to include explicit start (^) and end ($) anchors so that only exact matches will succeed.", "Audit all current VerificationPolicy configurations and verify that the applied keys and verification modes match the intended specifications, and monitor for any unexpected changes to policy application."], "summary": {"action": "Apply patch", "impact": "RegEx pattern bypass causing unintended policy match"}, "threat_synthesis": {"affected_systems": "The vulnerability affects Tekton Pipelines versions 0.43.0 through 1.11.0 released by the TektonCD project. Any cluster running a version in this range and relying on VerificationPolicies for resource validation is impacted.", "description_and_impact": "Tekton Pipelines uses regular expression matching in its VerificationPolicy to validate resource source strings against defined patterns. The Go function used, regexp.MatchString, reports a match when the pattern appears anywhere in the target string. Consequently, unanchored patterns can be circumvented when an attacker controls a source string that contains the trusted pattern as a substring, allowing the policy to falsely approve the resource. This flaw can result in a pipeline configuration being verified under an incorrect set of keys or modes, potentially enabling the execution of malicious or unauthorized code within the CI/CD workflow.", "risk_and_exploitability": "The CVSS score of 6.5 indicates medium severity. The EPSS score of 0.00032 indicates a very low exploitation probability, suggesting that the likelihood of attack is low. The vulnerability is not listed in the CISA KEV catalog. The likely attack vector involves an attacker who can supply or influence pipeline resource definitions, inserting a source string that contains the trusted pattern as a substring. By doing so, the attacker can cause an unintended policy match and alter the verification mode or keys applied to the pipeline. The exploitation requires the ability to modify or author a resource within the cluster, which may be achievable through privileged user or compromised CI tooling."}}}}, "created": "2026-04-21T17:30:37.395010+00:00", "updated": "2026-04-28T21:30:26.136080+00:00", "vendors": ["tektoncd", "tektoncd$PRODUCT$pipeline"]}