Vulnerability details
CVE-2026-27459
Red Hat Exploit IntelligenceRed Hat Ansible Automation Platform 2Red Hat Ansible Automation Platform Ansible Core 2Red Hat Ceph Storage 7Red Hat Ceph Storage 8Red Hat Ceph Storage 9
pyOpenSSL DTLS cookie callback buffer overflow
CVSS 4.0
7.2High
Official 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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.2High | 4.0 | CVEProject cvelistV5 (CNA) (GitHub_M) | CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U |
| 8.1High | 3.1 | CVEProject cvelistV5 (CNA) (redhat-SADP) | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Red Hat | Exploit Intelligence | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Ansible Automation Platform 2 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Ansible Automation Platform 2 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Ansible Automation Platform 2 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Ansible Automation Platform 2 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Ansible Automation Platform Ansible Core 2 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Ansible Automation Platform Ansible Core 2 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Ansible Automation Platform Ansible Core 2 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Ansible Automation Platform Ansible Core 2 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Ceph Storage 7 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Ceph Storage 8 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Ceph Storage 9 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat OpenShift AI (RHOAI) | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat OpenShift Container Platform 4 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat OpenStack Platform 18.0 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat OpenStack Platform 18.0 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat OpenStack Platform 18.0 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat OpenStack Platform 18.0 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat OpenStack Platform 18.0 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat OpenStack Platform 18.0 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat OpenStack Platform 18.0 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat OpenStack Platform 18.0 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat OpenStack Platform 18.0 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Satellite 6 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Update Infrastructure 4 for Cloud Providers | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Update Infrastructure 4 for Cloud Providers | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Update Infrastructure 5 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Update Infrastructure 5 | All | CVEProject cvelistV5 (CNA) |
| Red Hat | Red Hat Update Infrastructure 5 | All | CVEProject cvelistV5 (CNA) |
| pyca | pyopenssl | >= 22.0.0, < 26.0.0 | CVEProject cvelistV5 (CNA) |
References and advisories
26- https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4 x_refsource_CONFIRM
- https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408 x_refsource_MISC
- https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst x_refsource_MISC
- https://access.redhat.com/security/cve/CVE-2026-27459 vdb-entryx_refsource_REDHAT
- https://bugzilla.redhat.com/show_bug.cgi?id=2448503 issue-trackingx_refsource_REDHAT
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27459.json x_sadp-csaf-vex
- https://access.redhat.com/errata/RHSA-2026:13512 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:10754 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:14874 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:13508 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:14873 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:14835 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:13553 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:13545 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:59153 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:48758 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:7224 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:11916 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:11856 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:21017 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:24853 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:19375 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:22465 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:48085 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:11996 vendor-advisoryx_refsource_REDHAT
- https://access.redhat.com/errata/RHSA-2026:8437 vendor-advisoryx_refsource_REDHAT
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Details
- Published
- 2026-03-18
- Last updated
- 2026-09-11
- State
- Published
- Assigner (CNA)
- GitHub_M
Exploit prediction (EPSS)
0.74%
Probability of exploitation in 30 days
55.1%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')