Bug 2460292 (CVE-2026-40938)

Summary:	CVE-2026-40938 github.com/tektoncd/pipeline: Tekton Pipelines: Arbitrary code execution and secret exfiltration via malicious git commands
Product:	[Other] Security Response	Reporter:	OSIDB Bzimport <bzimport>
Component:	vulnerability	Assignee:	Product Security DevOps Team <prodsec-dev>
Status:	NEW ---	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	anpicker, bbrownin, bparees, dfreiber, dhanak, drosa, drow, dsimansk, eborisov, fdeutsch, hasun, jburrell, jfula, jkoehler, jowilson, kingland, kverlaen, lball, lphiri, mnovotny, ngough, nyancey, ometelka, oramraz, ptisnovs, sausingh, smullick, stirabos, syedriko, thason, veshanka, vkumar, xdharmai
Target Milestone:	---	Keywords:	Security
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Hardware:	All
OS:	Linux
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Doc Text:	A flaw was found in Tekton Pipelines, a system for declaring continuous integration/continuous delivery (CI/CD) pipelines. An authenticated user, able to submit `ResolutionRequest` objects, can exploit a vulnerability by injecting malicious commands into the git resolver's revision parameter. This allows for the execution of unauthorized programs on the resolver pod. Successful exploitation can lead to the exfiltration of all cluster-wide secrets, resulting in significant information disclosure.	Story Points:	---
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oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description OSIDB Bzimport 2026-04-21 21:02:39 UTC

Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. From 1.0.0 to before 1.11.0, 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. This vulnerability is fixed in 1.11.1.