Generation of Predictable Numbers or Identifiers Affecting libcurl package, versions [0,]
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-CONAN-LIBCURL-12632970
- published12 Sept 2025
- disclosed12 Sept 2025
- creditCalvin Ruocco
Introduced: 12 Sep 2025
NewCVE-2025-10148 (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 Generation of Predictable Numbers or Identifiers via the websocket component due to using a fixed 32 bit mask that persisted and was used throughout the entire connection instead of updating it for each new outgoing frame as the specification says. An attacker can manipulate traffic between communicating parties by exploiting the use of the fixed mask, potentially causing a proxy to cache maliciously crafted HTTP content that could later be served to other users.
Notes:
This is only exploitable if the libcurl-using application is communicating through such a (defective) proxy that confuses a WebSocket communication for HTTP traffic. Further, to trigger the problem it requires the traffic to be done using clear text HTTP / WebSocket (
ws://) and not over TLS (wss://);This flaw also affects the curl command line tool.