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CVE-2026-63349— AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups

Quick assessment

Affected
agronholm anyio
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. In 4.14.0, AnyIO accepts the POSIX extra_groups argument in anyio.run_process() and anyio.open_process(), but open_process() forwards the group

CVSS 7.0 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
agronholm anyio >= 4.14.0, < 4.14.2 affected
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I. Basic Information for CVE-2026-63349

Vulnerability Information

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Vulnerability Title
AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups
Source: CVE Program / CVE List V5
Vulnerability Description
AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. In 4.14.0, AnyIO accepts the POSIX extra_groups argument in anyio.run_process() and anyio.open_process(), but open_process() forwards the group argument to the backend instead of extra_groups. A caller that supplies extra_groups=[] to clear inherited supplementary groups can therefore launch a child that retains the parent process groups, undermining a privilege-dropping boundary. If group is also supplied, the integer group value is passed where an iterable of supplementary groups is expected and the launch can fail with TypeError. This issue affects POSIX applications that rely on AnyIO subprocess helpers to launch less-privileged child processes. This issue is fixed in version 4.14.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:P/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
特权授予不正确
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
agronholm anyio >= 4.14.0, < 4.14.2 -

II. Public POCs for CVE-2026-63349

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III. Intelligence Information for CVE-2026-63349

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Patches & Fixes for CVE-2026-63349 (2)

Other References for CVE-2026-63349 (2)

IV. Related Vulnerabilities

Same product: anyio
Same vendor: agronholm
Same weakness: CWE-266

V. Comments for CVE-2026-63349

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