Integer Overflow or Wraparound Affecting ko package, versions <0.18.1-r17
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.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Integer Overflow or Wraparound vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-CHAINGUARDLATEST-KO-17037164
- published29 May 2026
- disclosed22 May 2026
Introduced: 22 May 2026
NewCVE-2026-39834 (opens in a new tab)How to fix?
Upgrade Chainguard ko to version 0.18.1-r17 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream ko package and not the ko package as distributed by Chainguard.
See How to fix? for Chainguard relevant fixed versions and status.
When writing data larger than 4GB in a single Write call on an SSH channel, an integer overflow in the internal payload size calculation caused the write loop to spin indefinitely, sending empty packets without making progress. The size comparison now uses int64 to prevent truncation.