Vulnerability-Lookup

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

Vulnerability from cvelistv5 – Published: 2026-04-21 16:05 – Updated: 2026-04-21 16:48

Title

Tekton Pipelines: VerificationPolicy regex pattern bypass via substring matching

Summary

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.

Severity ?

6.5 (Medium)


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

CWE

CWE-185 - Incorrect Regular Expression

Assigner

GitHub_M

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

	Vendor	Product	Version
	tektoncd	pipeline	Affected: >= 0.43.0, <= 1.11.0

Show details on NVD website

JSON

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FKIE_CVE-2026-25542

Vulnerability from fkie_nvd - Published: 2026-04-21 17:16 - Updated: 2026-04-22 21:24

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

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    }
  ],
  "id": "CVE-2026-25542",
  "lastModified": "2026-04-22T21:24:26.997",
  "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"
      }
    ]
  },
  "published": "2026-04-21T17:16:24.213",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207362a"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-185"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

GHSA-RMX9-2PP3-XHCR

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

Summary

Tekton Pipelines has VerificationPolicy regex pattern bypass via substring matching

Details

Summary

The Trusted Resources verification system matches a resource source string (refSource.URI) against spec.resources[].pattern using Go's regexp.MatchString. In Go, regexp.MatchString reports a match if the pattern matches anywhere in the input string. As a result, common unanchored patterns—including examples found in Tekton documentation—can be bypassed by attacker-controlled source strings that contain the trusted pattern as a substring. This may cause an unintended policy match and alter which verification mode or keys are applied.

Affected Component

Repository: https://github.com/tektoncd/pipeline
Commit: 0133513db03dadb3cb08301d6b0330badcb63830
Call site: pkg/trustedresources/verify.go:118–137 (getMatchedPolicies)

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. For example, a pattern such as https://github.com/tektoncd/catalog.git would match an attacker-controlled source like 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.

Reproduction

Canonical (Demonstrates Vulnerability)

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

Expected (secure): Capability not reached; canonical does not emit vulnerability markers.
Actual (vulnerable): Capability reached; canonical emits vulnerability markers.
Canonical markers (mandatory): [CALLSITE_HIT] + [PROOF_MARKER]

Negative Control

bash ./run.sh control | tee /tmp/tekton-regex-001-control.log

Expected: Capability not reached under the same harness; control emits the control marker and does not emit vulnerability markers.
Control markers (mandatory): [CALLSITE_HIT] + [NC_MARKER]

Verification

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 Fix

It is recommended to make matching safe-by-default by requiring full-string matches, or by validating patterns and clearly documenting substring semantics. Possible approaches include:

Anchor patterns before matching — e.g., wrap pattern as ^(?:pattern)$ when not already anchored.
Introduce a separate field for exact match vs. regex match semantics.
Document substring semantics explicitly and update all documentation examples to include anchors.

A fix is considered accepted when, under the same harness, the canonical test still hits [CALLSITE_HIT] but does not emit [PROOF_MARKER].

Workarounds

Anchor all VerificationPolicy resource patterns so they must match the full source string. For example:

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

Proof Bundle

Bundle: poc.zip
Convention: The 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: ./poc/poc-F-TEKTON-REGEX-001/canonical.log, ./poc/poc-F-TEKTON-REGEX-001/control.log, ./poc/poc-F-TEKTON-REGEX-001/witness.txt
Integrity verification: Compare shasum -a 256 for canonical.log, control.log, fix.patch, and test source against witness.txt.

Note: If a supported integration uses verified HTTPS app-links or universal links only, provide the supported tag or branch and retesting on that pin can be arranged.

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": "1.11.0"
            }
          ],
          "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": null,
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThe Trusted Resources verification system matches a resource source string (`refSource.URI`) against `spec.resources[].pattern` using Go\u0027s `regexp.MatchString`. In Go, `regexp.MatchString` reports a match if the pattern matches **anywhere** in the input string. As a result, common unanchored patterns\u2014including examples found in Tekton documentation\u2014can be bypassed by attacker-controlled source strings that contain the trusted pattern as a substring. This may cause an unintended policy match and alter which verification mode or keys are applied.\n\n## Affected Component\n\n- **Repository:** \u003chttps://github.com/tektoncd/pipeline\u003e\n- **Commit:** `0133513db03dadb3cb08301d6b0330badcb63830`\n- **Call site:** `pkg/trustedresources/verify.go:118\u2013137` (`getMatchedPolicies`)\n\n## Impact\n\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. For example, a pattern such as `https://github.com/tektoncd/catalog.git` would match an attacker-controlled source like `https://evil.com/?x=https://github.com/tektoncd/catalog.git`.\n\n**Affected:** Deployments using Trusted Resources verification with unanchored `VerificationPolicy` patterns, where an attacker can influence the `refSource.URI` value used for policy matching.\n\n**Not affected:** Deployments that anchor all patterns (`^...$`) or otherwise enforce full-string matching; deployments where attackers cannot influence `refSource.URI`.\n\n## Reproduction\n\n### Canonical (Demonstrates Vulnerability)\n\n```bash\nunzip -q -o poc.zip -d /tmp/poc-tekton-regex-001\ncd /tmp/poc-tekton-regex-001/poc-F-TEKTON-REGEX-001\nbash ./run.sh canonical | tee /tmp/tekton-regex-001-canonical.log\n```\n\n- **Expected (secure):** Capability not reached; canonical does not emit vulnerability markers.\n- **Actual (vulnerable):** Capability reached; canonical emits vulnerability markers.\n- **Canonical markers (mandatory):** `[CALLSITE_HIT]` + `[PROOF_MARKER]`\n\n### Negative Control\n\n```bash\nbash ./run.sh control | tee /tmp/tekton-regex-001-control.log\n```\n\n- **Expected:** Capability not reached under the same harness; control emits the control marker and does not emit vulnerability markers.\n- **Control markers (mandatory):** `[CALLSITE_HIT]` + `[NC_MARKER]`\n\n### Verification\n\n```bash\ngrep -n \u0027\\[PROOF_MARKER\\]\u0027 /tmp/tekton-regex-001-canonical.log \\\n  \u0026\u0026 grep -n \u0027\\[NC_MARKER\\]\u0027 /tmp/tekton-regex-001-control.log \\\n  \u0026\u0026 ! grep -n \u0027\\[PROOF_MARKER\\]\u0027 /tmp/tekton-regex-001-control.log\n```\n\n## Suggested Fix\n\nIt is recommended to make matching safe-by-default by requiring full-string matches, or by validating patterns and clearly documenting substring semantics. Possible approaches include:\n\n1. **Anchor patterns before matching** \u2014 e.g., wrap `pattern` as `^(?:pattern)$` when not already anchored.\n2. **Introduce a separate field** for exact match vs. regex match semantics.\n3. **Document substring semantics explicitly** and update all documentation examples to include anchors.\n\nA fix is considered accepted when, under the same harness, the canonical test still hits `[CALLSITE_HIT]` but **does not** emit `[PROOF_MARKER]`.\n\n## Workarounds\n\nAnchor all `VerificationPolicy` resource patterns so they must match the full source string. For example:\n\n```yaml\npattern: \"^https://github\\\\.com/tektoncd/catalog\\\\.git$\"\n```\n\n## Proof Bundle\n\n- **Bundle:** [poc.zip](https://github.com/user-attachments/files/24833926/poc.zip)\n- **Convention:** The 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:** `./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- **Integrity verification:** Compare `shasum -a 256` for `canonical.log`, `control.log`, `fix.patch`, and test source against `witness.txt`.\n\n\u003e **Note:** If a supported integration uses verified HTTPS app-links or universal links only, provide the supported tag or branch and retesting on that pin can be arranged.",
  "id": "GHSA-rmx9-2pp3-xhcr",
  "modified": "2026-04-21T16:25:19Z",
  "published": "2026-04-21T16:25:19Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr"
    },
    {
      "type": "WEB",
      "url": "https://github.com/tektoncd/pipeline/commit/2c398711e6e9e232180508f0648425a8ea34dc9e"
    },
    {
      "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

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.

Detection rules are retrieved from Rulezet.

Action not permitted

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

FKIE_CVE-2026-25542

GHSA-RMX9-2PP3-XHCR

Summary

Affected Component

Impact

Reproduction

Canonical (Demonstrates Vulnerability)

Negative Control

Verification

Suggested Fix

Workarounds

Proof Bundle

Tags

Sightings

Nomenclature