CVE catalog
CVE-2026-63374
python-anyio: CVE-2026-63374
- Severity
- Critical · CVSS 9.3
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.29% · Oct 25, 2026
AnyIO is a high level asynchronous concurrency and networking framework that works on top of either Trio or asyncio. Prior to 4.14.2, connect_tcp() and TLSStream.wrap() can validate internationalized host names after the standard library converts them with IDNA 2003 instead of IDNA 2008. When a connection to a non-ASCII domain is hijacked or redirected, an attacker can obtain a legitimate certificate for the different ASCII hostname produced by IDNA 2003 and present it to the client, causing the malicious endpoint's certificate to validate. This issue is fixed in version 4.14.2.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | python-anyio | sid | 4.15.1-3 | fixed |
| Debian | python-anyio | forky | 4.15.1-3 | fixed |
| Debian | python-anyio | trixie | 4.8.0-3 | vulnerable |
| Debian | python-anyio | bookworm | 3.6.2-1 | vulnerable |
| PyPI | anyio | Not reported | 4.14.2 | fixed |
| PyPI | anyio | Not reported | 4.14.2 | fixed |
| Suse | python-anyio | linux enterprise module for public cloud 15 sp4 | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise module for public cloud 15 sp5 | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise module for public cloud 15 sp6 | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise module for python 3 15 sp7 | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise high performance computing 15 sp4-espos | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise high performance computing 15 sp4-ltss | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise high performance computing 15 sp5-espos | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise high performance computing 15 sp5-ltss | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise server 15 sp4-ltss | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise server 15 sp5-ltss | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise server 15 sp6-ltss | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise server for sap applications 15 sp4 | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise server for sap applications 15 sp5 | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise server for sap applications 15 sp6 | 4.1.0-150400.9.11.1 | fixed |
| Suse | python-anyio | linux enterprise server 16.0 | 4.8.0-160000.3.1 | fixed |
| Suse | python-anyio | linux enterprise server for sap applications 16.0 | 4.8.0-160000.3.1 | fixed |
| Opensuse | python-anyio | leap 16.0 | 4.8.0-160000.3.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | python-anyio | source | sid | 4.15.1-1 | not yet assigned | Not reported | [1148561] |
| Debian | python-anyio | source | forky | 4.15.1-1 | not yet assigned | Not reported | [1148561] |
| Debian | python-anyio | source | trixie | (unfixed) | not yet assigned | Not reported | [1148561] |
| Debian | python-anyio | source | bookworm | (unfixed) | not yet assigned | Not reported | [1148561] |
| PyPI | anyio | PyPI | Not reported | 4.14.2 | Not reported | GHSA-82R6-8W77-94W6 | Not reported |
| PyPI | anyio | PyPI | Not reported | 4.14.2 | Not reported | PYSEC-2026-4025 | Not reported |
| Suse | python-anyio | rpm | linux enterprise module for public cloud 15 sp4 | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise module for public cloud 15 sp5 | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise module for public cloud 15 sp6 | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise module for python 3 15 sp7 | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise high performance computing 15 sp4-espos | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise high performance computing 15 sp4-ltss | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise high performance computing 15 sp5-espos | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise high performance computing 15 sp5-ltss | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise server 15 sp4-ltss | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise server 15 sp5-ltss | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise server 15 sp6-ltss | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise server for sap applications 15 sp4 | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise server for sap applications 15 sp5 | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise server for sap applications 15 sp6 | 4.1.0-150400.9.11.1 | Not reported | SUSE-SU-2026:4416-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise server 16.0 | 4.8.0-160000.3.1 | Not reported | SUSE-SU-2026:24208-1 | Not reported |
| Suse | python-anyio | rpm | linux enterprise server for sap applications 16.0 | 4.8.0-160000.3.1 | Not reported | SUSE-SU-2026:24208-1 | Not reported |
| Opensuse | python-anyio | rpm | leap 16.0 | 4.8.0-160000.3.1 | Not reported | OPENSUSE-SU-2026:22060-1 | Not reported |
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-anyio]Affected
Source package: [python-anyio]
Details (2)
3.6.2-1· all · bookwormAffected
dsa · python-anyio · debian · bookworm; dsa · python-anyio · debian · 12
3.6.2-1· all · bookwormAffected
dsa · python-anyio · debian · bookworm; dsa · python-anyio · debian · 12
[Debian 13 (Trixie)]
- [python3-anyio]Affected
Source package: [python-anyio]
Details (2)
4.8.0-3· all · trixieAffected
dsa · python-anyio · debian · 13
4.8.0-3· all · trixieAffected
dsa · python-anyio · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-su-2026_4416-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-63374]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-63374]
- [https://osv.dev/vulnerability/PYSEC-2026-4025]
- [https://osv.dev/vulnerability/SUSE-SU-2026:24208-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:4416-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:22060-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-63374]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-63374.json]
[Debian Security Tracker] · [FIRST EPSS] · [GitHub Advisory Database] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]