CVE-2026-40924Public exploitNetwork attack vector

Cluster-wide resolver DoS via unbounded HTTP body read

Published Apr 21, 2026 · Updated Apr 21, 2026

Resource exhaustion in affected Tekton Pipelines releases allows remote authenticated users to crash cluster-wide resolution services. FetchHttpResource passes an attacker-controlled response body to io.ReadAll without a byte limit, exhausting the resolver pod's memory. Creating a TaskRun or PipelineRun that uses the HTTP resolver is required; repeated requests sustain the pod's crash loop and disable every shared resolver type.

CVSS severity6.5
Medium
EPSS probability0.32%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in affected Tekton Pipelines releases allows remote authenticated users to crash cluster-wide resolution services. FetchHttpResource passes an attacker-controlled response body to io.ReadAll without a byte limit, exhausting the resolver pod's memory. Creating a TaskRun or PipelineRun that uses the HTTP resolver is required; repeated requests sustain the pod's crash loop and disable every shared resolver type.

The record

CVE
CVE-2026-40924
Published
Apr 21, 2026
Updated
Apr 21, 2026
Vendor
Tekton
Product
Tekton Pipelines
Classifications
CWE-400, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 21, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 21, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 1.11.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Tekton · Tekton Pipelinesversion=< 1.11.1

Published CVSS scores

6.5GitHubCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation DoS

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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