Out-of-bounds Write Affecting open62541/open62541 package, versions [1.5.0-rc1,1.5.0-rc2)
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 applications- Snyk IDSNYK-UNMANAGED-OPEN62541OPEN62541-15248313
- published8 Feb 2026
- disclosed5 Feb 2026
- creditAndrew Fasano
Introduced: 5 Feb 2026
CVE-2026-1301 (opens in a new tab)How to fix?
Upgrade open62541/open62541 to version 1.5.0-rc2 or higher.
Overview
Affected versions of this package are vulnerable to Out-of-bounds Write in the decoder process when PubSub and JSON are enabled. An attacker can corrupt memory and cause a crash by sending a crafted JSON message before authentication.