Description
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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| pyca | pyopenssl | >= 0.14.0, < 26.0.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | pyopenssl | 26.0.0-1 | — |
| Debian 13 | pyopenssl | 25.0.0-1+deb13u1 | — |
| Debian 12 | pyopenssl | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 25.10 | pyopenssl | 25.0.0-1ubuntu0.1 | — |
| Ubuntu 24.04 LTS | pyopenssl | 23.2.0-1ubuntu0.1 | — |
| Ubuntu 22.04 LTS | pyopenssl | 21.0.0-1ubuntu0.1 | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 20.04 LTS | pyopenssl | 19.0.0-1ubuntu0.1~esm1 | USN-8335-1 |
| Ubuntu Pro 18.04 LTS | pyopenssl | 17.5.0-1ubuntu1+esm1 | USN-8335-1 |
| Ubuntu Pro 16.04 LTS | pyopenssl | 0.15.1-2ubuntu0.2+esm1 | USN-8335-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat Hardened Images 1 | pyOpenSSL +2 | 26.0.0-1.1.hum1 | RHSA-2026:7224 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 15 SP7 | python3-pyOpenSSL | 21.0.0-150400.22.1 | SUSE-SU-2026:3424-1 |
| SLES 15 SP6 | python-pyOpenSSL | 23.2.0-150400.3.13.1 | SUSE-SU-2026:1192-1 |
| SLES 15 SP5 | python-pyOpenSSL | 23.2.0-150400.3.13.1 | SUSE-SU-2026:1192-1 |
| SLES 15 SP4 | python-pyOpenSSL | 23.2.0-150400.3.13.1 | SUSE-SU-2026:1192-1 |
| SLES 12 SP5 | python-pyOpenSSL | 17.1.0-4.32.1 | SUSE-SU-2026:1582-1 |
Show 17 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 3 | python-pyOpenSSL | 23.2.0-150400.3.13.1 | SUSE-SU-2026:1192-1 |
| SLES for SAP 16.0 | python-pyOpenSSL | 25.0.0-160000.3.1 | SUSE-SU-2026:20930-1 |
| SLES for SAP 15 SP6 | python-pyOpenSSL | 23.2.0-150400.3.13.1 | SUSE-SU-2026:1192-1 |
| SLES for SAP 15 SP5 | python-pyOpenSSL | 23.2.0-150400.3.13.1 | SUSE-SU-2026:1192-1 |
| SLES for SAP 15 SP4 | python-pyOpenSSL | 23.2.0-150400.3.13.1 | SUSE-SU-2026:1192-1 |
| SLES 16.0 | python-pyOpenSSL | 25.0.0-160000.3.1 | SUSE-SU-2026:20930-1 |
| SLE Micro 6.1 | python-pyOpenSSL | 24.0.0-slfo.1.1_2.1 | SUSE-SU-2026:20954-1 |
| SLE Micro 6.0 | python-pyOpenSSL | 24.0.0-2.1 | SUSE-SU-2026:20960-1 |
| SLE Micro 5.5 | python3-pyOpenSSL | 21.0.0-150400.22.1 | SUSE-SU-2026:3424-1 |
| SLE Micro 5.4 | python3-pyOpenSSL | 21.0.0-150400.22.1 | SUSE-SU-2026:3424-1 |
| SLE Micro 5.3 | python3-pyOpenSSL | 21.0.0-150400.22.1 | SUSE-SU-2026:3424-1 |
| SLE Micro 5.2 | python-pyOpenSSL | 19.0.0-150300.3.3.1 | SUSE-SU-2026:1416-1 |
| SLE HPC 15 SP5 | python-pyOpenSSL | 23.2.0-150400.3.13.1 | SUSE-SU-2026:1192-1 |
| SLE HPC 15 SP4 | python-pyOpenSSL | 23.2.0-150400.3.13.1 | SUSE-SU-2026:1192-1 |
| SUSE Multi Linux Manager Tools SLE-Micro-5 | venv-salt-minion | 3006.0-150002.5.19.1 | SUSE-RU-2026:2769-1 |
| SUSE Multi Linux Manager Tools SLE-15 | venv-salt-minion | 3006.0-150002.5.19.1 | SUSE-RU-2026:2769-1 |
| SUSE Manager Client Tools for RHEL, Liberty and Clones 9 | venv-salt-minion | 3006.0-1.76.1 | SUSE-EL-9-CLIENT-TOOLS-2026-2255 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | python-pyOpenSSL | 26.0.0-1.1 | openSUSE-SU-2026:10392-1 |
| openSUSE Leap 16.0 | python-pyOpenSSL | 25.0.0-160000.3.1 | openSUSE-SU-2026:20419-1 |
| openSUSE Leap 15.6 | python-pyOpenSSL | 23.2.0-150400.3.13.1 | SUSE-SU-2026:1192-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | py3-openssl | 26.1.0-r0 | — |
| Alpine v3.23 | py3-openssl | 26.1.0-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | pyOpenSSL | 24.2.1-2 | — |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 9 | python3-pyOpenSSL | 19.0.0-1.0.3.el9 | ELSA-2026-50324 |
| Oracle Linux 9 | python39-oci-sdk +1 | 2.187.0-1.0.5.el9 | ELSA-2026-604898 |
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | airflow-3 | 3.1.8-r8 | — |
| Wolfi rolling | az | 2.84.0-r3 | — |
| Wolfi rolling | datadog-agent-7.72-core-integrations | No fix yet | — |
| Wolfi rolling | datadog-agent-7.73-core-integrations | 7.73.3-r23 | — |
| Wolfi rolling | datadog-agent-7.77-core-integrations | 7.77.3-r5 | — |
| Wolfi rolling | ggshield | 1.51.0-r1 | — |
| Wolfi rolling | mitmproxy | 12.2.1-r0 | — |
| Wolfi rolling | py3-cassandra-medusa | 0.27.0-r5 | — |
| Wolfi rolling | superset-6.0 | 6.0.0-r4 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | pyopenssl | >= 0.14.0, < 26.0.0 | 26.0.0 | GHSA-vp96-hxj8-p424 |
| PyPI | pyopenssl | >= 0.14, < 26.0.0 | 26.0.0 | PYSEC-2026-2268 |
Advisories 16
- WID-SEC-2026-1183 Red Hat Hardened Images RPMs (jq und pyOpenSSL): Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 12, 2026
- ELSA-2026-604898 Important: python-oci-sdk security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Oct 21, 2026
- RHSA-2026:7224 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 10, 2026
- SUSE-SU-2026:3424-1 Security update for python3-pyOpenSSL SUSE / openSUSE Security Updates · Jul 31, 2026
- SUSE-EL-9-CLIENT-TOOLS-2026-2255 Security update 5.0.8 for Multi-Linux Manager Salt Bundle SUSE / openSUSE Security Updates · Jul 24, 2026
- SUSE-RU-2026:2769-1 Recommended update 5.1.4 for Multi-Linux Manager Salt Bundle SUSE / openSUSE Security Updates · Jul 21, 2026
- ELSA-2026-50324 Moderate: pyOpenSSL security update (Oracle Linux 9) Oracle Linux Security Advisories (ELSA) · Jun 24, 2026
- USN-8335-1 pyopenssl vulnerability Ubuntu Security Notices (USN) · May 28, 2026
- SUSE-SU-2026:1582-1 Security update for python-pyOpenSSL SUSE / openSUSE Security Updates · Apr 25, 2026
- SUSE-SU-2026:1416-1 Security update for python-pyOpenSSL SUSE / openSUSE Security Updates · Apr 17, 2026
- SUSE-SU-2026:20954-1 Security update for python-pyOpenSSL SUSE / openSUSE Security Updates · Apr 8, 2026
- SUSE-SU-2026:20960-1 Security update for python-pyOpenSSL SUSE / openSUSE Security Updates · Apr 8, 2026
- SUSE-SU-2026:1192-1 Security update for python-pyOpenSSL SUSE / openSUSE Security Updates · Apr 8, 2026
- SUSE-SU-2026:20930-1 Security update for python-pyOpenSSL SUSE / openSUSE Security Updates · Apr 2, 2026
- openSUSE-SU-2026:20419-1 Security update for python-pyOpenSSL SUSE / openSUSE Security Updates · Mar 29, 2026
- openSUSE-SU-2026:10392-1 python311-pyOpenSSL-26.0.0-1.1 on GA media SUSE / openSUSE Security Updates · Mar 20, 2026