CVE-2026-40938

Estado: ModificadaAlta (8.5)—
Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 1.0.0 and prior to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1, the git resolver's revision parameter is passed directly as a positional argument to git fetch without any validation that it does not begin with a - character. Because git parses flags from mixed positional arguments, an attacker can inject arbitrary git fetch flags such as --upload-pack=<binary>.
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Combined with the validateRepoURL function explicitly permitting URLs that begin with / (local filesystem paths), a tenant who can submit ResolutionRequest objects can chain these two behaviors to execute an arbitrary binary on the resolver pod. The tekton-pipelines-resolvers ServiceAccount holds cluster-wide get/list/watch on all Secrets, so code execution on the resolver pod enables full cluster-wide secret exfiltration. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.
CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
Puntuación base: 8.5
Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.90%
Percentil entre todas las CVEs puntuadas: 58
Fecha de la puntuación: 6/10/2026
EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).
🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.
ExplotaciónT1210 Exploitation of Remote Serviceslateral movement85 %
Impacto principalT1059 Command and Scripting Interpreterexecution90 %
Impacto secundarioT1098.003 Additional Cloud Rolespersistence · privilege escalation70 %
Impacto secundarioT1552.007 Container APIcredential access85 %
Ataque remoto que requiere privilegios (PR:L) contra servicio Kubernetes: inyección de flags en git fetch permite ejecución binaria en resolver pod. Exfiltración de secretos cluster-wide via ServiceAccount comprometida.
Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.
🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Privileged Account Management User Account Management Network Segmentation Disable or Remove Feature or Program Vulnerability Scanning Threat Intelligence Program
Tecnologías afectadas (1)

Linuxfoundation — Tekton Pipelines
CWE

CWE-88
CWE-88
Referencias

JSON original (NVD)

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  "published": "2026-04-21T21:16:46.283",
  "references": [
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      "tags": [
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      "source": "security-advisories@github.com",
      "description": [
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          "value": "CWE-88"
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          "value": "CWE-88"
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      "value": "Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 1.0.0 and prior to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1, the git resolver's revision parameter is passed directly as a positional argument to git fetch without any validation that it does not begin with a - character. Because git parses flags from mixed positional arguments, an attacker can inject arbitrary git fetch flags such as --upload-pack=<binary>. Combined with the validateRepoURL function explicitly permitting URLs that begin with / (local filesystem paths), a tenant who can submit ResolutionRequest objects can chain these two behaviors to execute an arbitrary binary on the resolver pod. The tekton-pipelines-resolvers ServiceAccount holds cluster-wide get/list/watch on all Secrets, so code execution on the resolver pod enables full cluster-wide secret exfiltration. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue."
    }
  ],
  "lastModified": "2026-08-24T13:18:32.270",
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        {
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}