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4 vulnerabilities found for anyio by agronholm
CVE-2026-64847 (GCVE-0-2026-64847)
Vulnerability from nvd – Published: 2026-09-18 17:04 – Updated: 2026-09-18 18:07
VLAI
EPSS
VEX
Title
AnyIO process-pool workers can block indefinitely on undrained stderr
Summary
AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, AnyIO starts process-pool workers with standard error connected to a pipe that the parent never drains, even though the documented behavior redirects all three standard streams. Worker code that writes enough attacker-influenced data to sys.stderr can fill the pipe and block before returning the standard-output protocol response, causing the awaiting process-pool call to remain blocked indefinitely. Applications that run untrusted or faulty worker code capable of producing substantial standard-error output are affected. This issue is fixed in version 4.14.2.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 18:07 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/agronholm/anyio/security/advis… | x_refsource_CONFIRM |
| https://github.com/agronholm/anyio/pull/1207 | x_refsource_MISC |
| https://github.com/agronholm/anyio/commit/f1b7301… | x_refsource_MISC |
| https://github.com/agronholm/anyio/releases/tag/4.14.2 | x_refsource_MISC |
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CVE-2026-63349 (GCVE-0-2026-63349)
Vulnerability from nvd – Published: 2026-09-18 17:02 – Updated: 2026-09-18 17:02
VLAI
EPSS
VEX
Title
AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups
Summary
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.
Severity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/agronholm/anyio/security/advis… | x_refsource_CONFIRM |
| https://github.com/agronholm/anyio/pull/1209 | x_refsource_MISC |
| https://github.com/agronholm/anyio/commit/eb562e6… | x_refsource_MISC |
| https://github.com/agronholm/anyio/releases/tag/4.14.2 | x_refsource_MISC |
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CVE-2026-64847 (GCVE-0-2026-64847)
Vulnerability from cvelistv5 – Published: 2026-09-18 17:04 – Updated: 2026-09-18 18:07
VLAI
EPSS
VEX
Title
AnyIO process-pool workers can block indefinitely on undrained stderr
Summary
AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, AnyIO starts process-pool workers with standard error connected to a pipe that the parent never drains, even though the documented behavior redirects all three standard streams. Worker code that writes enough attacker-influenced data to sys.stderr can fill the pipe and block before returning the standard-output protocol response, causing the awaiting process-pool call to remain blocked indefinitely. Applications that run untrusted or faulty worker code capable of producing substantial standard-error output are affected. This issue is fixed in version 4.14.2.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-18 18:07 UTC
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/agronholm/anyio/security/advis… | x_refsource_CONFIRM |
| https://github.com/agronholm/anyio/pull/1207 | x_refsource_MISC |
| https://github.com/agronholm/anyio/commit/f1b7301… | x_refsource_MISC |
| https://github.com/agronholm/anyio/releases/tag/4.14.2 | x_refsource_MISC |
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CVE-2026-63349 (GCVE-0-2026-63349)
Vulnerability from cvelistv5 – Published: 2026-09-18 17:02 – Updated: 2026-09-18 17:02
VLAI
EPSS
VEX
Title
AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups
Summary
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.
Severity
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://github.com/agronholm/anyio/security/advis… | x_refsource_CONFIRM |
| https://github.com/agronholm/anyio/pull/1209 | x_refsource_MISC |
| https://github.com/agronholm/anyio/commit/eb562e6… | x_refsource_MISC |
| https://github.com/agronholm/anyio/releases/tag/4.14.2 | x_refsource_MISC |
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},
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"tags": [
"x_refsource_MISC"
],
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}
],
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"advisory": "GHSA-3w57-8xmc-8v26",
"discovery": "UNKNOWN"
},
"title": "AnyIO run_process/open_process ignores extra_groups and can retain parent supplementary groups"
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