Resource Exhaustion Affecting actions-runner package, versions <2.334.0-r2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-CHAINGUARDLATEST-ACTIONSRUNNER-16799842
- published22 May 2026
- disclosed29 May 2026
Introduced: 22 May 2026
NewCVE-2026-45149 (opens in a new tab)How to fix?
Upgrade Chainguard actions-runner to version 2.334.0-r2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream actions-runner package and not the actions-runner package as distributed by Chainguard.
See How to fix? for Chainguard relevant fixed versions and status.
The brace-expansion library generates arbitrary strings containing a common prefix and suffix. From 5.0.0 to before 5.0.6, the max option was being applied too late. When expanding a single large numeric range like {1..10000000}, the sequence generation loop generates all 10 million intermediate elements before the max limit is applied With max=10, the output is correctly limited to 10 items, but the process still allocates ~505 MB and spends ~800ms building the full intermediate array. This vulnerability is fixed in 5.0.6.