Allocation of Resources Without Limits or Throttling Affecting open62541 package, versions [1.4.6,]
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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- published2 Jul 2026
- disclosed2 Jul 2026
- creditLorenzo Cannella
Introduced: 2 Jul 2026
CVE-2026-33592 (opens in a new tab)How to fix?
A fix was pushed into the master branch but not yet published.
Overview
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via the FindServers process. An attacker can cause the server to allocate excessive memory by sending a FindServersRequest with an unbounded serverUris field, delivering a very large string in multiple chunks without completing the request. This leads the server to buffer all chunks in RAM indefinitely until the SecureChannel times out, potentially resulting in resource exhaustion and denial of service. This is only exploitable if the attacker can access the Discovery Service pre-session, as the attack bypasses all encryption configuration.