Resource Exhaustion Affecting actions-runner package, versions <2.334.0-r2


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

Social Trends
EPSS
0.28% (20th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-ACTIONSRUNNER-16799842
  • published22 May 2026
  • disclosed29 May 2026

Introduced: 22 May 2026

CVE-2026-45149  (opens in a new tab)
CWE-400  (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.

CVSS Base Scores

version 3.1