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daily-triage/stale-pipeline-cache-masks-critical-dependency-vulnerability.md
Daily Triage Briefing

Stale Pipeline Cache Masks Critical Dependency Vulnerability in CI/CD

Impact Summary

A stale build cache in the CI/CD pipeline prevents dependency updates from being fetched, causing security scans to report false negatives. Engineers must invalidate the cache and re-run the pipeline to expose the vulnerable library.

SeveritySEV-3
StatusResolved simulation
PlatformCI/CD & Developer Platforms
Incident TypeCI/CD & Developer Platforms
Published1 Sept 2026
Technologies Involved
CI/CD

Simulation Label

Fictional simulation. This exercise is a bounded, invented training scenario for practising operational reasoning. No real organisation, incident, telemetry, credentials or production identifiers are involved or implied.

Operational Summary

Root Cause

Stale build cache prevented the CI/CD pipeline from fetching updated dependency metadata, leading to a false negative in security scanning.

Detection Method

Evidence-led guided investigation

Current Status

Resolved simulation

Affected Services

CI/CD

Incident Overview

You are on call for the Platform Engineering team. The nightly security scan for the payment-gateway service reported zero vulnerabilities.

However, the external vulnerability database published a critical CVE for a transitive dependency used by this service six hours ago. The pipeline logs show the build completed successfully in four minutes, significantly faster than the usual twelve-minute duration.

Investigation Options

Review the available operational moves and select the best immediate action.

A

Manually edit package-lock.json to remove the vulnerable library reference.

B

Invalidate the CI/CD build cache and trigger a fresh pipeline run.

C

Update the security scanning tool configuration to increase the timeout.

D

Restart the CI/CD runner agents to clear local memory.

Tags:CI/CD