CriticalFix available

Security update for python-anyio

Type: advisorySource: OSV1 source record

This update for python-anyio fixes the following issues: - CVE-2026-63374: : TLSStream IDNA 2003 host name encoding enables potential TLS certificate spoofing (bsc#1281476). - CVE-2026-64847: AnyIO process-pool workers can block indefinitely on undrained stderr (bsc#1281475).

Announced 2 Oct 2026Source revision 1

Original source ↗

SUSE-SU-2026:4416-1

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:SUSE-SU-2026:4416-1

python-anyio

Source reference: /affected/0/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/0/ranges
Prerequisites: Not stated in this record

python-anyio

Source reference: /affected/1/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/1/ranges
Prerequisites: Not stated in this record

python-anyio

Source reference: /affected/2/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/2/ranges
Prerequisites: Not stated in this record

python-anyio

Source reference: /affected/3/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/3/ranges
Prerequisites: Not stated in this record

python-anyio

Source reference: /affected/4/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/4/ranges
Prerequisites: Not stated in this record

python-anyio

Source reference: /affected/5/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/5/ranges
Prerequisites: Not stated in this record

python-anyio

Source reference: /affected/6/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/6/ranges
Prerequisites: Not stated in this record

python-anyio

Source reference: /affected/7/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/7/ranges
Prerequisites: Not stated in this record

python-anyio

Source reference: /affected/8/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/8/ranges
Prerequisites: Not stated in this record

python-anyio

Source reference: /affected/9/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/9/ranges
Prerequisites: Not stated in this record

python-anyio

Source reference: /affected/10/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/10/ranges
Prerequisites: Not stated in this record

python-anyio

Source reference: /affected/11/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/11/ranges
Prerequisites: Not stated in this record

python-anyio

Source reference: /affected/12/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/12/ranges
Prerequisites: Not stated in this record

python-anyio

Source reference: /affected/13/package/name

Affected versions: Not stated in this record
Fixed versions: 4.1.0-150400.9.11.1
Source reference: /affected/13/ranges
Prerequisites: Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

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    },
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]

Related CVEs: CVE-2026-63374
Source reference: /upstream
CVE-2026-64847
Source reference: /upstream

Publisher severity

No explicit severity was provided.

Linked CVE context

These ratings describe the referenced vulnerabilities and products. They are not a severity rating for every application using this dependency.

CVE-2026-63374 · Critical

anyio

Event: #71334 · Revision 1
Added to Heist Feed: Sun, 25 Oct 2026 22:45:49 GMT
Publisher date: Fri, 02 Oct 2026 09:18:08 GMT

Read the original announcement