Description
pyOpenSSL is a Python wrapper around the OpenSSL library. Starting in version 22.0.0 and prior to version 26.0.0, if a user provided callback to `set_cookie_generate_callback` returned a cookie value greater than 256 bytes, pyOpenSSL would overflow an OpenSSL provided buffer. Starting in version 26.0.0, cookie values that are too long are now rejected.
Metrics
CVSS 3.1 9.8/10
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| pyca | pyopenssl | >= 22.0.0, < 26.0.0 |
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 8 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 9 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 | — |
| Red Hat | Red Hat Satellite 6.16 for RHEL 8 | — |
| Red Hat | Red Hat Satellite 6.16 for RHEL 9 | — |
| Red Hat | Red Hat Satellite 6.17 for RHEL 9 | — |
| Red Hat | Red Hat Satellite 6.18 for RHEL 9 | — |
| Red Hat | RHUI 4 for RHEL 8 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.5 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.5 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.6 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.6 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.6 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.6 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.6 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.6 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.7 | — |
| Red Hat | Red Hat Ansible Automation Platform 2.7 | — |
| Red Hat | Red Hat Hardened Images | — |
| Red Hat | Red Hat Hardened Images | — |
| Red Hat | Red Hat Quay 3.10 | — |
| Red Hat | Red Hat Quay 3.12 | — |
| Red Hat | Red Hat Quay 3.14 | — |
| Red Hat | Red Hat Quay 3.15 | — |
| Red Hat | Red Hat Quay 3.16 | — |
| Red Hat | Red Hat Quay 3.17 | — |
| Red Hat | Red Hat Quay 3.18 | — |
| Red Hat | Red Hat Quay 3.9 | — |
| Red Hat | Red Hat Trusted Artifact Signer 1.4 | — |
| Red Hat | Confidential Compute Attestation | — |
| Red Hat | Exploit Intelligence | — |
| Red Hat | Lightspeed Core | — |
| Red Hat | Lightspeed Core | — |
| Red Hat | Lightspeed Core | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
| Red Hat | Red Hat Ansible Automation Platform 2 | — |
References
- https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rstRelease Notes
- https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408Patch
- https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4Vendor Advisory
- https://access.redhat.com/errata/RHSA-2026:10754
- https://access.redhat.com/errata/RHSA-2026:11856
- https://access.redhat.com/errata/RHSA-2026:11916
- https://access.redhat.com/errata/RHSA-2026:11996
- https://access.redhat.com/errata/RHSA-2026:13508
- https://access.redhat.com/errata/RHSA-2026:13512
- https://access.redhat.com/errata/RHSA-2026:13545
- https://access.redhat.com/errata/RHSA-2026:13553
- https://access.redhat.com/errata/RHSA-2026:14835
- https://access.redhat.com/errata/RHSA-2026:14873
- https://access.redhat.com/errata/RHSA-2026:14874
- https://access.redhat.com/errata/RHSA-2026:19375
- https://access.redhat.com/errata/RHSA-2026:21017
- https://access.redhat.com/errata/RHSA-2026:22465
- https://access.redhat.com/errata/RHSA-2026:24853
- https://access.redhat.com/errata/RHSA-2026:48085
- https://access.redhat.com/errata/RHSA-2026:48758
- https://access.redhat.com/errata/RHSA-2026:59153
- https://access.redhat.com/errata/RHSA-2026:7224
- https://access.redhat.com/errata/RHSA-2026:8437
- https://access.redhat.com/security/cve/CVE-2026-27459
- https://bugzilla.redhat.com/show_bug.cgi?id=2448503
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27459.json
Timeline
- Published
- Mar 18, 2026
- Last modified
- Sep 10, 2026
- NVD status
- Modified