CVE catalog
CVE-2026-27448
pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled ex
- Severity
- Medium · CVSS 5.4
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N - Published
- Source
- [NVD] · [CVE record]
- EPSS
- 0.25% · Oct 25, 2026
pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 0.14.0 and prior to version 26.0.0, if a user provided callback to `set_tlsext_servername_callback` raised an unhandled exception, this would result in a connection being accepted. If a user was relying on this callback for any security-sensitive behavior, this could allow bypassing it. Starting in version 26.0.0, unhandled exceptions now result in rejecting the connection.
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 | pyopenssl | sid | 26.4.0-1 | fixed |
| Debian | pyopenssl | forky | 26.4.0-1 | fixed |
| Debian | pyopenssl | trixie | 25.0.0-1+deb13u1 | fixed |
| Debian | pyopenssl | bookworm | 23.0.0-1 | vulnerable |
| Pip | pyopenssl | Not reported | 26.0.0 | fixed |
| Cpe | pyopenssl | Not reported | Not reported | vulnerable |
| Cpe | pyopenssl | Not reported | 23.2.0-1ubuntu0.1 | fixed |
| Cpe | python-openssl-doc | Not reported | 23.2.0-1ubuntu0.1 | fixed |
| Cpe | python3-openssl | Not reported | 23.2.0-1ubuntu0.1 | fixed |
| PyPI | pyopenssl | Not reported | 26.0.0 | fixed |
| PyPI | pyopenssl | Not reported | 26.0.0 | fixed |
| Suse | python3-pyOpenSSL | linux enterprise micro 5.3 | 21.0.0-150400.22.1 | fixed |
| Suse | python3-pyOpenSSL | linux enterprise micro 5.4 | 21.0.0-150400.22.1 | fixed |
| Suse | python3-pyOpenSSL | linux enterprise micro 5.5 | 21.0.0-150400.22.1 | fixed |
| Suse | python3-pyOpenSSL | linux enterprise module for basesystem 15 sp7 | 21.0.0-150400.22.1 | fixed |
| Suse | venv-salt-minion | manager client tools for rhel, liberty and clones 9-client-tools | 3006.0-1.76.1 | fixed |
| Suse | venv-salt-minion | multi linux manager tools sle-15 | 3006.0-150002.5.19.1 | fixed |
| Suse | venv-salt-minion | multi linux manager tools sle-micro-5 | 3006.0-150002.5.19.1 | fixed |
| Ubuntu | pyopenssl | 22.04 | 20.0.1-1 | vulnerable |
| Ubuntu | pyopenssl | 22.04 | 21.0.0-1 | vulnerable |
| Ubuntu | pyopenssl | 22.04 | 21.0.0-1ubuntu0.1 | fixed |
| Ubuntu | pyopenssl | 24.04 | 23.0.0-1 | vulnerable |
| Ubuntu | pyopenssl | 24.04 | 23.2.0-1 | vulnerable |
| Ubuntu | pyopenssl | 24.04 | 23.2.0-1ubuntu0.1 | fixed |
| Ubuntu | pyopenssl | 25.10 | 25.0.0-1 | vulnerable |
| Ubuntu | pyopenssl | 25.10 | 25.0.0-1ubuntu0.1 | fixed |
| Ubuntu | pyopenssl | pro | 19.0.0-1 | vulnerable |
| Ubuntu | pyopenssl | pro | 19.0.0-1build1 | vulnerable |
| Ubuntu | pyopenssl | pro | 19.0.0-1ubuntu0.1~esm1 | fixed |
| Ubuntu | pyopenssl | pro | 19.0.0-1 | vulnerable |
| Ubuntu | pyopenssl | pro | 19.0.0-1build1 | vulnerable |
| Ubuntu | pyopenssl | pro | 19.0.0-1ubuntu0.1~esm1 | fixed |
| Ubuntu | pyopenssl | 22.04 | 20.0.1-1 | vulnerable |
| Ubuntu | pyopenssl | 22.04 | 21.0.0-1 | vulnerable |
| Ubuntu | pyopenssl | 22.04 | 21.0.0-1ubuntu0.1 | fixed |
| Ubuntu | pyopenssl | 24.04 | 23.0.0-1 | vulnerable |
| Ubuntu | pyopenssl | 24.04 | 23.2.0-1 | vulnerable |
| Ubuntu | pyopenssl | 24.04 | 23.2.0-1ubuntu0.1 | fixed |
| Ubuntu | pyopenssl | 25.10 | 25.0.0-1 | vulnerable |
| Ubuntu | pyopenssl | 25.10 | 25.0.0-1ubuntu0.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise server ltss extended security 12 sp5 | 17.1.0-4.32.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise micro 5.2 | 19.0.0-150300.3.3.1 | fixed |
| Suse | python-pyOpenSSL | linux micro 6.1 | 24.0.0-slfo.1.1_2.1 | fixed |
| Suse | python-pyOpenSSL | linux micro 6.0 | 24.0.0-2.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise module for public cloud 15 sp4 | 23.2.0-150400.3.13.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise module for python 3 15 sp7 | 23.2.0-150400.3.13.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise high performance computing 15 sp4-espos | 23.2.0-150400.3.13.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise high performance computing 15 sp4-ltss | 23.2.0-150400.3.13.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise high performance computing 15 sp5-espos | 23.2.0-150400.3.13.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise high performance computing 15 sp5-ltss | 23.2.0-150400.3.13.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise server 15 sp4-ltss | 23.2.0-150400.3.13.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise server 15 sp5-ltss | 23.2.0-150400.3.13.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise server 15 sp6-ltss | 23.2.0-150400.3.13.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise server for sap applications 15 sp4 | 23.2.0-150400.3.13.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise server for sap applications 15 sp5 | 23.2.0-150400.3.13.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise server for sap applications 15 sp6 | 23.2.0-150400.3.13.1 | fixed |
| Opensuse | python-pyOpenSSL | leap 15.6 | 23.2.0-150400.3.13.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise server 16.0 | 25.0.0-160000.3.1 | fixed |
| Suse | python-pyOpenSSL | linux enterprise server for sap applications 16.0 | 25.0.0-160000.3.1 | fixed |
| Opensuse | python-pyOpenSSL | leap 16.0 | 25.0.0-160000.3.1 | fixed |
| Opensuse | python-pyOpenSSL | tumbleweed | 26.0.0-1.1 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | pyopenssl | source | sid | 26.0.0-1 | not yet assigned | Not reported | Not reported |
| Debian | pyopenssl | source | forky | 26.0.0-1 | not yet assigned | Not reported | Not reported |
| Debian | pyopenssl | source | trixie | 25.0.0-1+deb13u1 | not yet assigned | Not reported | Not reported |
| Debian | pyopenssl | source | bookworm | (unfixed) | not yet assigned | Not reported | Not reported |
| Pip | pyopenssl | pip | Not reported | 26.0.0 | Not reported | Not reported | Not reported |
| Cpe | pyopenssl | cpe | Not reported | 23.2.0-1ubuntu0.1 | Not reported | Not reported | Not reported |
| Cpe | python-openssl-doc | cpe | Not reported | 23.2.0-1ubuntu0.1 | Not reported | Not reported | Not reported |
| Cpe | python3-openssl | cpe | Not reported | 23.2.0-1ubuntu0.1 | Not reported | Not reported | Not reported |
| PyPI | pyopenssl | PyPI | Not reported | 26.0.0 | Not reported | GHSA-VP96-HXJ8-P424 | Not reported |
| PyPI | pyopenssl | PyPI | Not reported | 26.0.0 | Not reported | Not reported | Not reported |
| Suse | python3-pyOpenSSL | rpm | linux enterprise micro 5.3 | 21.0.0-150400.22.1 | Not reported | SUSE-SU-2026:3424-1 | Not reported |
| Suse | python3-pyOpenSSL | rpm | linux enterprise micro 5.4 | 21.0.0-150400.22.1 | Not reported | SUSE-SU-2026:3424-1 | Not reported |
| Suse | python3-pyOpenSSL | rpm | linux enterprise micro 5.5 | 21.0.0-150400.22.1 | Not reported | SUSE-SU-2026:3424-1 | Not reported |
| Suse | python3-pyOpenSSL | rpm | linux enterprise module for basesystem 15 sp7 | 21.0.0-150400.22.1 | Not reported | SUSE-SU-2026:3424-1 | Not reported |
| Suse | venv-salt-minion | rpm | manager client tools for rhel, liberty and clones 9-client-tools | 3006.0-1.76.1 | Not reported | SUSE-EL-9-CLIENT-TOOLS-2026-2255 | Not reported |
| Suse | venv-salt-minion | rpm | multi linux manager tools sle-15 | 3006.0-150002.5.19.1 | Not reported | SUSE-RU-2026:2769-1 | Not reported |
| Suse | venv-salt-minion | rpm | multi linux manager tools sle-micro-5 | 3006.0-150002.5.19.1 | Not reported | SUSE-RU-2026:2769-1 | Not reported |
| Ubuntu | pyopenssl | deb | 22.04 | 21.0.0-1ubuntu0.1 | Not reported | USN-8115-1 | Not reported |
| Ubuntu | pyopenssl | deb | 24.04 | 23.2.0-1ubuntu0.1 | Not reported | USN-8115-1 | Not reported |
| Ubuntu | pyopenssl | deb | 25.10 | 25.0.0-1ubuntu0.1 | Not reported | USN-8115-1 | Not reported |
| Ubuntu | pyopenssl | deb | pro | 19.0.0-1ubuntu0.1~esm1 | Not reported | USN-8335-1 | Not reported |
| Ubuntu | pyopenssl | deb | pro | 19.0.0-1ubuntu0.1~esm1 | Not reported | UBUNTU-CVE-2026-27448 | Not reported |
| Ubuntu | pyopenssl | deb | 22.04 | 21.0.0-1ubuntu0.1 | Not reported | UBUNTU-CVE-2026-27448 | Not reported |
| Ubuntu | pyopenssl | deb | 24.04 | 23.2.0-1ubuntu0.1 | Not reported | UBUNTU-CVE-2026-27448 | Not reported |
| Ubuntu | pyopenssl | deb | 25.10 | 25.0.0-1ubuntu0.1 | Not reported | UBUNTU-CVE-2026-27448 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise server ltss extended security 12 sp5 | 17.1.0-4.32.1 | Not reported | SUSE-SU-2026:1582-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise micro 5.2 | 19.0.0-150300.3.3.1 | Not reported | SUSE-SU-2026:1416-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux micro 6.1 | 24.0.0-slfo.1.1_2.1 | Not reported | SUSE-SU-2026:20954-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux micro 6.0 | 24.0.0-2.1 | Not reported | SUSE-SU-2026:20960-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise module for public cloud 15 sp4 | 23.2.0-150400.3.13.1 | Not reported | SUSE-SU-2026:1192-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise module for python 3 15 sp7 | 23.2.0-150400.3.13.1 | Not reported | SUSE-SU-2026:1192-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise high performance computing 15 sp4-espos | 23.2.0-150400.3.13.1 | Not reported | SUSE-SU-2026:1192-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise high performance computing 15 sp4-ltss | 23.2.0-150400.3.13.1 | Not reported | SUSE-SU-2026:1192-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise high performance computing 15 sp5-espos | 23.2.0-150400.3.13.1 | Not reported | SUSE-SU-2026:1192-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise high performance computing 15 sp5-ltss | 23.2.0-150400.3.13.1 | Not reported | SUSE-SU-2026:1192-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise server 15 sp4-ltss | 23.2.0-150400.3.13.1 | Not reported | SUSE-SU-2026:1192-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise server 15 sp5-ltss | 23.2.0-150400.3.13.1 | Not reported | SUSE-SU-2026:1192-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise server 15 sp6-ltss | 23.2.0-150400.3.13.1 | Not reported | SUSE-SU-2026:1192-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise server for sap applications 15 sp4 | 23.2.0-150400.3.13.1 | Not reported | SUSE-SU-2026:1192-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise server for sap applications 15 sp5 | 23.2.0-150400.3.13.1 | Not reported | SUSE-SU-2026:1192-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise server for sap applications 15 sp6 | 23.2.0-150400.3.13.1 | Not reported | SUSE-SU-2026:1192-1 | Not reported |
| Opensuse | python-pyOpenSSL | rpm | leap 15.6 | 23.2.0-150400.3.13.1 | Not reported | SUSE-SU-2026:1192-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise server 16.0 | 25.0.0-160000.3.1 | Not reported | SUSE-SU-2026:20930-1 | Not reported |
| Suse | python-pyOpenSSL | rpm | linux enterprise server for sap applications 16.0 | 25.0.0-160000.3.1 | Not reported | SUSE-SU-2026:20930-1 | Not reported |
| Opensuse | python-pyOpenSSL | rpm | leap 16.0 | 25.0.0-160000.3.1 | Not reported | OPENSUSE-SU-2026:20419-1 | Not reported |
| Opensuse | python-pyOpenSSL | rpm | tumbleweed | 26.0.0-1.1 | Not reported | OPENSUSE-SU-2026:10392-1 | Not reported |
Notes
[bookworm] pyopenssl: Minor issue
OpenFactory catalog packages
[Debian 12 (Bookworm)]
- [python3-openssl]Affected
Source package: [pyopenssl]
Details (2)
23.0.0-1· all · bookwormAffected
nvd · pyopenssl · debian · bookworm; nvd · pyopenssl · debian · 12
23.0.0-1· all · bookwormAffected
nvd · pyopenssl · debian · bookworm; nvd · pyopenssl · debian · 12
- [python-openssl-doc]Affected
Source package: [pyopenssl]
Details (2)
23.0.0-1· all · bookwormAffected
nvd · pyopenssl · debian · bookworm; nvd · pyopenssl · debian · 12
23.0.0-1· all · bookwormAffected
nvd · pyopenssl · debian · bookworm; nvd · pyopenssl · debian · 12
[openSUSE Tumbleweed]
- [python313-pyOpenSSL]Unknown
Source package: [python-pyOpenSSL]
Details (1)
26.4.0-1.1· noarch · tumbleweedUnknown · Fixed:
26.0.0-1.1Version impact unknown
nvd · python-pyOpenSSL · opensuse · tumbleweed
- [python314-pyOpenSSL]Unknown
Source package: [python-pyOpenSSL]
Details (1)
26.4.0-1.1· noarch · tumbleweedUnknown · Fixed:
26.0.0-1.1Version impact unknown
nvd · python-pyOpenSSL · opensuse · tumbleweed
[Debian 13 (Trixie)]
- [python3-openssl]Fixed
Source package: [pyopenssl]
Details (2)
25.0.0-1+deb13u1· all · trixieFixed · Fixed:
25.0.0-1+deb13u1nvd · pyopenssl · debian · 13
25.0.0-1+deb13u1· all · trixieFixed · Fixed:
25.0.0-1+deb13u1nvd · pyopenssl · debian · 13
- [python-openssl-doc]Fixed
Source package: [pyopenssl]
Details (2)
25.0.0-1+deb13u1· all · trixieFixed · Fixed:
25.0.0-1+deb13u1nvd · pyopenssl · debian · 13
25.0.0-1+deb13u1· all · trixieFixed · Fixed:
25.0.0-1+deb13u1nvd · pyopenssl · debian · 13
Observed:
References
- [https://ftp.suse.com/pub/projects/security/csaf/suse-ru-2026_2769-1.json]
- [https://nvd.nist.gov/vuln/detail/CVE-2026-27448]
- [https://osv.dev/vulnerability/DEBIAN-CVE-2026-27448]
- [https://osv.dev/vulnerability/GHSA-vp96-hxj8-p424]
- [https://osv.dev/vulnerability/SUSE-EL-9-CLIENT-TOOLS-2026-2255]
- [https://osv.dev/vulnerability/SUSE-RU-2026:2769-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:1192-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:1416-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:1582-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:20930-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:20954-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:20960-1]
- [https://osv.dev/vulnerability/SUSE-SU-2026:3424-1]
- [https://osv.dev/vulnerability/UBUNTU-CVE-2026-27448]
- [https://osv.dev/vulnerability/USN-8115-1]
- [https://osv.dev/vulnerability/USN-8335-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:10392-1]
- [https://osv.dev/vulnerability/openSUSE-SU-2026:20419-1]
- [https://security-tracker.debian.org/tracker/CVE-2026-27448]
- [https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27448.json]
- [https://ubuntu.com/security/notices/USN-8115-1]
- [https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1183.json]
[CERT-Bund public advisories] · [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] · [Ubuntu Security Notices (USN)]