Vulnerability-Lookup

CVE-2026-25542 (GCVE-0-2026-25542)

Vulnerability from cvelistv5 – Published: 2026-04-21 16:05 – Updated: 2026-05-22 16:06

Title

Tekton Pipelines: VerificationPolicy regex pattern bypass via substring matching

Summary

Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 0.43.0 and prior to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1, 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. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.

Severity

6.5 (Medium)


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

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-04-21 16:48 UTC

CWE

CWE-185 - Incorrect Regular Expression

Assigner

GitHub_M mitre root

References

2 references

URL	Tags
https://github.com/tektoncd/pipeline/security/adv…	x_refsource_CONFIRM
https://github.com/tektoncd/pipeline/commit/b8905…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
tektoncd	pipeline	Affected: >= 0.43.0, < 1.0.2 Affected: >= 1.2.0, < 1.3.4 Affected: >= 1.4.0, < 1.6.2 Affected: >= 1.7.0, < 1.9.3 Affected: >= 1.10.0, < 1.11.1	guessed

Show details on NVD website

JSON

To clipboard

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CLEANSTART-2026-GR84261 (CVE-2026-33818)

Vulnerability from cleanstart – Published: 2026-09-01 11:17 – Updated: 2026-09-18 11:59 – Source website

Withdrawn 2026-09-18

Summary

Security fixes in tekton-chains-fips 0.24.0-r1

Details

Package tekton-chains-fips version 0.24.0-r1 fixes 26 vulnerabilities: CVE-2026-33818, CVE-2026-46600, CVE-2026-56853, CVE-2026-56858, CVE-2026-56859...

References

URL

Type

https://github.com/tektoncd/chains

WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "tekton-chains-fips"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.24.0-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.24.0-r1"
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "Package tekton-chains-fips version 0.24.0-r1 fixes 26 vulnerabilities: CVE-2026-33818, CVE-2026-46600, CVE-2026-56853, CVE-2026-56858, CVE-2026-56859...",
  "id": "CLEANSTART-2026-GR84261",
  "modified": "2026-09-18T11:59:01.768079Z",
  "published": "2026-09-01T11:17:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/chains"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "summary": "Security fixes in tekton-chains-fips 0.24.0-r1",
  "upstream": [
    "CVE-2026-33818",
    "CVE-2026-46600",
    "CVE-2026-56853",
    "CVE-2026-56858",
    "CVE-2026-56859",
    "CVE-2026-56860",
    "CVE-2026-56862",
    "CVE-2026-39821",
    "ghsa-gcjh-h69q-9w9g",
    "ghsa-pmwq-pjrm-6p5r",
    "CVE-2026-22703",
    "CVE-2026-49478",
    "CVE-2026-48702",
    "CVE-2025-66564",
    "CVE-2026-25542",
    "CVE-2026-33022",
    "CVE-2026-2303",
    "CVE-2026-39883",
    "ghsa-hrxh-6v49-42gf",
    "CVE-2026-56864",
    "CVE-2026-56865",
    "ghsa-259r-337f-4rfw",
    "ghsa-3fxj-6jh8-hvhx",
    "ghsa-9g5q-2w5x-hmxf",
    "ghsa-rjr7-jggh-pgcp",
    "CVE-2026-41178"
  ],
  "withdrawn": "2026-09-18T11:59:01.768079Z"
}

CLEANSTART-2026-HA54107 (GHSA-GCJH-H69Q-9W9G)

Vulnerability from cleanstart – Published: 2026-09-01 11:17 – Updated: 2026-09-18 11:59 – Source website

Withdrawn 2026-09-18

Summary

Security fixes in tekton-chains 0.25.2-r1

Details

Package tekton-chains version 0.25.2-r1 fixes 23 vulnerabilities: ghsa-gcjh-h69q-9w9g, ghsa-pmwq-pjrm-6p5r, CVE-2026-49478, CVE-2026-48702, CVE-2026-49834...

References

URL

Type

https://github.com/tektoncd/chains

WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "tekton-chains"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.25.2-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.25.2-r1"
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "Package tekton-chains version 0.25.2-r1 fixes 23 vulnerabilities: ghsa-gcjh-h69q-9w9g, ghsa-pmwq-pjrm-6p5r, CVE-2026-49478, CVE-2026-48702, CVE-2026-49834...",
  "id": "CLEANSTART-2026-HA54107",
  "modified": "2026-09-18T11:59:01.768079Z",
  "published": "2026-09-01T11:17:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/chains"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "summary": "Security fixes in tekton-chains 0.25.2-r1",
  "upstream": [
    "ghsa-gcjh-h69q-9w9g",
    "ghsa-pmwq-pjrm-6p5r",
    "CVE-2026-49478",
    "CVE-2026-48702",
    "CVE-2026-49834",
    "CVE-2026-54787",
    "CVE-2026-39984",
    "CVE-2026-49835",
    "CVE-2026-40161",
    "CVE-2026-40938",
    "CVE-2026-25542",
    "CVE-2026-40923",
    "CVE-2026-40924",
    "CVE-2026-2303",
    "CVE-2026-39883",
    "ghsa-hrxh-6v49-42gf",
    "CVE-2026-56864",
    "CVE-2026-56865",
    "ghsa-259r-337f-4rfw",
    "ghsa-3fxj-6jh8-hvhx",
    "ghsa-9g5q-2w5x-hmxf",
    "ghsa-rjr7-jggh-pgcp",
    "CVE-2026-41178"
  ],
  "withdrawn": "2026-09-18T11:59:01.768079Z"
}

CLEANSTART-2026-NJ73427 (CVE-2026-39821)

Vulnerability from cleanstart – Published: 2026-09-01 11:17 – Updated: 2026-09-18 11:59 – Source website

Withdrawn 2026-09-18

Summary

Security fixes in tekton-chains-fips 0.25.2-r1

Details

Package tekton-chains-fips version 0.25.2-r1 fixes 31 vulnerabilities: CVE-2026-39821, CVE-2026-33818, CVE-2026-46600, CVE-2026-56853, CVE-2026-56858...

References

URL

Type

https://github.com/tektoncd/chains

WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "tekton-chains-fips"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.25.2-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.25.2-r1"
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "Package tekton-chains-fips version 0.25.2-r1 fixes 31 vulnerabilities: CVE-2026-39821, CVE-2026-33818, CVE-2026-46600, CVE-2026-56853, CVE-2026-56858...",
  "id": "CLEANSTART-2026-NJ73427",
  "modified": "2026-09-18T11:59:01.768079Z",
  "published": "2026-09-01T11:17:16Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/chains"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "summary": "Security fixes in tekton-chains-fips 0.25.2-r1",
  "upstream": [
    "CVE-2026-39821",
    "CVE-2026-33818",
    "CVE-2026-46600",
    "CVE-2026-56853",
    "CVE-2026-56858",
    "CVE-2026-56859",
    "CVE-2026-56860",
    "CVE-2026-56862",
    "ghsa-gcjh-h69q-9w9g",
    "ghsa-pmwq-pjrm-6p5r",
    "CVE-2026-49478",
    "CVE-2026-48702",
    "CVE-2026-54787",
    "CVE-2026-49834",
    "CVE-2026-49835",
    "CVE-2026-39984",
    "CVE-2026-40161",
    "CVE-2026-40938",
    "CVE-2026-25542",
    "CVE-2026-40923",
    "CVE-2026-40924",
    "CVE-2026-2303",
    "CVE-2026-39883",
    "ghsa-hrxh-6v49-42gf",
    "CVE-2026-56865",
    "CVE-2026-56864",
    "ghsa-259r-337f-4rfw",
    "ghsa-rjr7-jggh-pgcp",
    "ghsa-3fxj-6jh8-hvhx",
    "ghsa-9g5q-2w5x-hmxf",
    "CVE-2026-41178"
  ],
  "withdrawn": "2026-09-18T11:59:01.768079Z"
}

CLEANSTART-2026-VQ84921 (CVE-2026-25542)

Vulnerability from cleanstart – Published: 2026-09-18 09:44 – Updated: 2026-08-14 12:25 – Source website

Summary

Security fix for CVE-2026-25542 applied in: tekton-chains 0.25.2-r1, tekton-chains-fips 0.24.0-r1, tekton-chains-fips 0.25.2-r1

Details

CVE-2026-25542 affects multiple packages. This issue is resolved in later releases. See references for individual vulnerability details.

References

URL

Type

	https://github.com/cleanstart-dev/cleanstart-secu…	ADVISORY
	https://osv.dev/vulnerability/CVE-2026-25542	WEB
	https://nvd.nist.gov/vuln/detail/CVE-2026-25542	WEB

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "tekton-chains"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.25.2-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "tekton-chains-fips"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.24.0-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "CleanStart",
        "name": "tekton-chains-fips"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.25.2-r1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "credits": [],
  "database_specific": {},
  "details": "CVE-2026-25542 affects multiple packages. This issue is resolved in later releases. See references for individual vulnerability details.",
  "id": "CLEANSTART-2026-VQ84921",
  "modified": "2026-08-14T12:25:42Z",
  "published": "2026-09-18T09:44:09.623202Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/cleanstart-dev/cleanstart-security-advisories/tree/main/advisories/2026/CLEANSTART-2026-VQ84921.json"
    },
    {
      "type": "WEB",
      "url": "https://osv.dev/vulnerability/CVE-2026-25542"
    },
    {
      "type": "WEB",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25542"
    }
  ],
  "related": [],
  "schema_version": "1.7.3",
  "summary": "Security fix for CVE-2026-25542 applied in: tekton-chains 0.25.2-r1, tekton-chains-fips 0.24.0-r1, tekton-chains-fips 0.25.2-r1",
  "upstream": [
    "CVE-2026-25542"
  ]
}

FKIE_CVE-2026-25542

Vulnerability from fkie_nvd - Published: 2026-04-21 17:16 - Updated: 2026-06-17 10:24

Severity

6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207362a	Patch
	security-advisories@github.com	https://github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr	Exploit, Vendor Advisory

Impacted products

	Vendor	Product	Version
	linuxfoundation	tekton_pipelines	*

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "pipeline",
          "vendor": "tektoncd",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 0.43.0, \u003c 1.0.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.2.0, \u003c 1.3.4"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.4.0, \u003c 1.6.2"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.7.0, \u003c 1.9.3"
            },
            {
              "status": "affected",
              "version": "\u003e= 1.10.0, \u003c 1.11.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:linuxfoundation:tekton_pipelines:*:*:*:*:*:go:*:*",
              "matchCriteriaId": "CBCD7D1F-1C53-41D3-B631-219678FDA581",
              "versionEndExcluding": "1.11.0",
              "versionStartIncluding": "0.43.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 0.43.0 and prior to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1, 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. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue."
    }
  ],
  "id": "CVE-2026-25542",
  "lastModified": "2026-06-17T10:24:49.533",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-25542",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-04-21T16:48:04.873157Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2026-04-21T17:16:24.213",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207362a"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-185"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

GHSA-RMX9-2PP3-XHCR

Vulnerability from github – Published: 2026-04-21 16:25 – Updated: 2026-05-22 16:05

Summary

Tekton Pipelines has VerificationPolicy regex pattern bypass via substring matching

Details

hey guys,

triage contract this is a first-screen summary; deterministic proof is in the proof bundle (canonical.log/control.log/witness.txt).

summary 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.

pins - repo: https://github.com/tektoncd/pipeline - commit: 0133513db03dadb3cb08801d6b0330badcb63830 - callsite: pkg/trustedresources/verify.go:118-137 (getMatchedPolicies)

severity MEDIUM (provisional CVSS 5.3–6.5) (signing request tampering)

repro (canonical) - command: unzip -q -o poc.zip -d poc && cd poc/poc-F-TEKTON-REGEX-001 && make canonical - expected: cap not reached; canonical does not emit the vulnerability markers. - actual: cap reached; canonical emits the vulnerability markers. - canonical markers (mandatory): [CALLSITE_HIT] + [PROOF_MARKER]

negative control - command: unzip -q -o poc.zip -d poc && cd poc/poc-F-TEKTON-REGEX-001 && make control - expected: cap not reached under the same harness; control emits the control marker and does not emit the vulnerability markers. - control markers (mandatory): [CALLSITE_HIT] + [NC_MARKER]

fix consider making matching safe-by-default by requiring full-string matches (or validating patterns and documenting substring semantics clearly). one option is to anchor patterns before matching (e.g., wrap pattern as ^(?:pattern)$ when not already anchored), or to provide a separate field for exact match vs regex match. fix accepted when: under the same harness, canonical still hits [CALLSITE_HIT] but does not emit [PROOF_MARKER].

proof bundle pointers - bundle: poc.zip - bundle convention: zip extracts under a single top-level folder (poc-F-TEKTON-REGEX-001/) to avoid collisions - contains: canonical.log, control.log, witness.txt - extracted paths: after extraction, see ./poc/poc-F-TEKTON-REGEX-001/canonical.log, ./poc/poc-F-TEKTON-REGEX-001/control.log, ./poc/poc-F-TEKTON-REGEX-001/witness.txt - verify: compare shasum -a 256 for canonical.log/control.log/fix.patch/test source against witness.txt - supported-mode note: if your supported integration uses verified https app-links/universal links only, provide the supported tag/branch and we can retest on that pin.

poc.zip

impact an attacker can craft a trusted resources source string that embeds a trusted substring and still matches an unanchored verificationpolicy spec.resources[].pattern, even if the policy is intended to constrain matches to a specific trusted source. this occurs because regexp.MatchString succeeds on substring matches, so patterns like https://github.com/tektoncd/catalog.git match attacker-controlled sources such as https://evil.com/?x=https://github.com/tektoncd/catalog.git.

affected: deployments using trusted resources verification with unanchored verificationpolicy patterns, where an attacker can influence the refSource.URI value used for policy matching.

not affected: deployments that anchor all patterns (^...$) or otherwise enforce full-string matching; deployments where attackers cannot influence refSource.URI.

steps to reproduce

unzip -q -o poc.zip -d /tmp/poc-tekton-regex-001
cd /tmp/poc-tekton-regex-001/poc-F-TEKTON-REGEX-001
bash ./run.sh canonical | tee /tmp/tekton-regex-001-canonical.log
bash ./run.sh control | tee /tmp/tekton-regex-001-control.log
grep -n '\\[PROOF_MARKER\\]' /tmp/tekton-regex-001-canonical.log && grep -n '\\[NC_MARKER\\]' /tmp/tekton-regex-001-control.log && ! grep -n '\\[PROOF_MARKER\\]' /tmp/tekton-regex-001-control.log

suggested patch options: - make matching safe-by-default by anchoring patterns before matching (or by validating and rejecting unanchored patterns). - document the substring semantics explicitly and update documentation examples to include anchors.

workarounds anchor verificationpolicy resource patterns so they must match the full source string. example:

^https://github.com/tektoncd/catalog\\.git$

best, oleh

Severity

6.5 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/tektoncd/pipeline"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.43.0"
            },
            {
              "fixed": "1.0.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/tektoncd/pipeline"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.2.0"
            },
            {
              "fixed": "1.3.4"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/tektoncd/pipeline"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.4.0"
            },
            {
              "fixed": "1.6.2"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/tektoncd/pipeline"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.7.0"
            },
            {
              "fixed": "1.9.3"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/tektoncd/pipeline"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.10.0"
            },
            {
              "fixed": "1.11.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-25542"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-185"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-04-21T16:25:19Z",
    "nvd_published_at": "2026-04-21T17:16:24Z",
    "severity": "MODERATE"
  },
  "details": "hey guys,\n\ntriage contract\nthis is a first-screen summary; deterministic proof is in the proof bundle (canonical.log/control.log/witness.txt).\n\nsummary\ntrusted 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.\n\npins\n- repo: https://github.com/tektoncd/pipeline\n- commit: 0133513db03dadb3cb08801d6b0330badcb63830\n- callsite: pkg/trustedresources/verify.go:118-137 (getMatchedPolicies)\n\nseverity\nMEDIUM (provisional CVSS 5.3\u20136.5) (signing request tampering)\n\nrepro (canonical)\n- command: unzip -q -o poc.zip -d poc \u0026\u0026 cd poc/poc-F-TEKTON-REGEX-001 \u0026\u0026 make canonical\n- expected: cap not reached; canonical does not emit the vulnerability markers.\n- actual: cap reached; canonical emits the vulnerability markers.\n- canonical markers (mandatory): [CALLSITE\\_HIT] + [PROOF\\_MARKER]\n\nnegative control\n- command: unzip -q -o poc.zip -d poc \u0026\u0026 cd poc/poc-F-TEKTON-REGEX-001 \u0026\u0026 make control\n- expected: cap not reached under the same harness; control emits the control marker and does not emit the vulnerability markers.\n- control markers (mandatory): [CALLSITE\\_HIT] + [NC\\_MARKER]\n\nfix\nconsider making matching safe-by-default by requiring full-string matches (or validating patterns and documenting substring semantics clearly). one option is to anchor patterns before matching (e.g., wrap `pattern` as `^(?:pattern)$` when not already anchored), or to provide a separate field for exact match vs regex match.\nfix accepted when: under the same harness, canonical still hits [CALLSITE\\_HIT] but does not emit [PROOF\\_MARKER].\n\nproof bundle pointers\n- bundle: poc.zip\n- bundle convention: zip extracts under a single top-level folder (poc-F-TEKTON-REGEX-001/) to avoid collisions\n- contains: canonical.log, control.log, witness.txt\n- extracted paths: after extraction, see ./poc/poc-F-TEKTON-REGEX-001/canonical.log, ./poc/poc-F-TEKTON-REGEX-001/control.log, ./poc/poc-F-TEKTON-REGEX-001/witness.txt\n- verify: compare shasum -a 256 for canonical.log/control.log/fix.patch/test source against witness.txt\n- supported-mode note: if your supported integration uses verified https app-links/universal links only, provide the supported tag/branch and we can retest on that pin.\n\n[poc.zip](https://github.com/user-attachments/files/24833926/poc.zip)\n\n---\n\nimpact\nan attacker can craft a trusted resources source string that embeds a trusted substring and still matches an unanchored verificationpolicy `spec.resources[].pattern`, even if the policy is intended to constrain matches to a specific trusted source. this occurs because `regexp.MatchString` succeeds on substring matches, so patterns like `https://github.com/tektoncd/catalog.git` match attacker-controlled sources such as `https://evil.com/?x=https://github.com/tektoncd/catalog.git`.\n\naffected: deployments using trusted resources verification with unanchored verificationpolicy patterns, where an attacker can influence the `refSource.URI` value used for policy matching.\n\nnot affected: deployments that anchor all patterns (`^...$`) or otherwise enforce full-string matching; deployments where attackers cannot influence `refSource.URI`.\n\nsteps to reproduce\n```bash\nunzip -q -o poc.zip -d /tmp/poc-tekton-regex-001\ncd /tmp/poc-tekton-regex-001/poc-F-TEKTON-REGEX-001\nbash ./run.sh canonical | tee /tmp/tekton-regex-001-canonical.log\nbash ./run.sh control | tee /tmp/tekton-regex-001-control.log\ngrep -n \u0027\\\\[PROOF_MARKER\\\\]\u0027 /tmp/tekton-regex-001-canonical.log \u0026\u0026 grep -n \u0027\\\\[NC_MARKER\\\\]\u0027 /tmp/tekton-regex-001-control.log \u0026\u0026 ! grep -n \u0027\\\\[PROOF_MARKER\\\\]\u0027 /tmp/tekton-regex-001-control.log\n```\n\nsuggested patch options:\n- make matching safe-by-default by anchoring patterns before matching (or by validating and rejecting unanchored patterns).\n- document the substring semantics explicitly and update documentation examples to include anchors.\n\nworkarounds\nanchor verificationpolicy resource patterns so they must match the full source string. example:\n\n- `^https://github.com/tektoncd/catalog\\\\.git$`\n\nbest,\noleh",
  "id": "GHSA-rmx9-2pp3-xhcr",
  "modified": "2026-05-22T16:05:24Z",
  "published": "2026-04-21T16:25:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-25542"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/pipeline/commit/2c398711e6e9e232180508f0648425a8ea34dc9e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207362a"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/tektoncd/pipeline"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/pipeline/releases/tag/v1.11.0"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Tekton Pipelines has VerificationPolicy regex pattern bypass via substring matching"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-25542 (GCVE-0-2026-25542)

CLEANSTART-2026-GR84261 (CVE-2026-33818)

CLEANSTART-2026-HA54107 (GHSA-GCJH-H69Q-9W9G)

CLEANSTART-2026-NJ73427 (CVE-2026-39821)

CLEANSTART-2026-VQ84921 (CVE-2026-25542)

FKIE_CVE-2026-25542

GHSA-RMX9-2PP3-XHCR

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Related by attack behaviour