Incorrect Privilege Assignment Affecting anyio package, versions [4.14.0,4.14.2)
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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- published20 Sept 2026
- disclosed18 Sept 2026
- creditt4z1ge
Introduced: 18 Sep 2026
NewCVE-2026-63349 (opens in a new tab)How to fix?
Upgrade anyio to version 4.14.2 or higher.
Overview
anyio is a High level compatibility layer for multiple asynchronous event loop implementations
Affected versions of this package are vulnerable to Incorrect Privilege Assignment via the open_process() function in src/anyio/_core/_subprocesses.py, where the extra_groups parameter is silently ignored and replaced with the value of group when spawning a subprocess. An attacker with control over process invocation can cause the subprocess to run with unintended supplementary group memberships - either gaining privileges the caller intended to restrict, or losing privileges the caller intended to grant - because the wrong group list is forwarded to the backend.