CVE-2026-27459 (GCVE-0-2026-27459)
Vulnerability from cvelistv5 – Published: 2026-03-17 23:34 – Updated: 2026-09-11 12:09
VLAI
EPSS
VEX
Title
pyOpenSSL DTLS cookie callback buffer overflow
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-18 19:52 UTC
CWE
- CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
26 references
Impacted products
50 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| pyca | pyopenssl |
Affected:
>= 22.0.0, < 26.0.0
|
guessed | |
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 8 |
Unaffected:
0:26.0.0-1.el8ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.5::el8 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.5 for RHEL 9 |
Unaffected:
0:26.0.0-1.el9ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.5::el9 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 |
Unaffected:
0:4.7.11-2.el9ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.6 for RHEL 9 |
Unaffected:
0:26.0.0-1.el9ap , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
||
| Red Hat | Red Hat Satellite 6.16 for RHEL 8 |
Unaffected:
0:24.1.0-2.el8pc , < *
(rpm)
cpe:/a:redhat:satellite:6.16::el8 cpe:/a:redhat:satellite_capsule:6.16::el8 |
||
| Red Hat | Red Hat Satellite 6.16 for RHEL 9 |
Unaffected:
0:24.1.0-2.el9pc , < *
(rpm)
cpe:/a:redhat:satellite:6.16::el9 cpe:/a:redhat:satellite_capsule:6.16::el9 |
||
| Red Hat | Red Hat Satellite 6.17 for RHEL 9 |
Unaffected:
0:25.1.0-0.3.el9pc , < *
(rpm)
cpe:/a:redhat:satellite:6.17::el9 cpe:/a:redhat:satellite_capsule:6.17::el9 |
||
| Red Hat | Red Hat Satellite 6.18 for RHEL 9 |
Unaffected:
0:26.0.0-2.el9pc , < *
(rpm)
cpe:/a:redhat:satellite:6.18::el9 cpe:/a:redhat:satellite_capsule:6.18::el9 |
||
| Red Hat | RHUI 4 for RHEL 8 |
Unaffected:
0:24.1.0-2.el8ui , < *
(rpm)
cpe:/a:redhat:rhui:4::el8 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.5 |
Unaffected:
1777398315 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.5::el8 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.5 |
Unaffected:
1777403872 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.5::el8 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.6 |
Unaffected:
1777390240 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.6 |
Unaffected:
1777296732 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.6 |
Unaffected:
1777391447 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.6 |
Unaffected:
1777299023 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.6 |
Unaffected:
1777387242 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.6 |
Unaffected:
1777390333 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.6::el9 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.7 |
Unaffected:
1787235693 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.7::el9 |
||
| Red Hat | Red Hat Ansible Automation Platform 2.7 |
Unaffected:
1787217531 , < *
(rpm)
cpe:/a:redhat:ansible_automation_platform:2.7::el9 |
||
| Red Hat | Red Hat Hardened Images |
Unaffected:
2.20.0-0.8.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
||
| Red Hat | Red Hat Hardened Images |
Unaffected:
26.0.0-1.1.hum1 , < *
(rpm)
cpe:/a:redhat:hummingbird:1 |
||
| Red Hat | Red Hat Quay 3.10 |
Unaffected:
1776736910 , < *
(rpm)
cpe:/a:redhat:quay:3.10::el8 |
||
| Red Hat | Red Hat Quay 3.12 |
Unaffected:
1776752646 , < *
(rpm)
cpe:/a:redhat:quay:3.12::el8 |
||
| Red Hat | Red Hat Quay 3.14 |
Unaffected:
1779689392 , < *
(rpm)
cpe:/a:redhat:quay:3.14::el8 |
||
| Red Hat | Red Hat Quay 3.15 |
Unaffected:
1780891395 , < *
(rpm)
cpe:/a:redhat:quay:3.15::el8 |
||
| Red Hat | Red Hat Quay 3.16 |
Unaffected:
1779204086 , < *
(rpm)
cpe:/a:redhat:quay:3.16::el9 |
||
| Red Hat | Red Hat Quay 3.17 |
Unaffected:
1779922205 , < *
(rpm)
cpe:/a:redhat:quay:3.17::el9 |
||
| Red Hat | Red Hat Quay 3.18 |
Unaffected:
1784987273 , < *
(rpm)
cpe:/a:redhat:quay:3.18::el9 |
||
| Red Hat | Red Hat Quay 3.9 |
Unaffected:
1776782369 , < *
(rpm)
cpe:/a:redhat:quay:3.9::el8 |
||
| Red Hat | Red Hat Trusted Artifact Signer 1.4 |
Unaffected:
1775815407 , < *
(rpm)
cpe:/a:redhat:trusted_artifact_signer:1.4::el9 |
||
| Red Hat | Confidential Compute Attestation |
cpe:/a:redhat:confidential_compute_attestation:1
|
||
| Red Hat | Exploit Intelligence |
cpe:/a:redhat:exploit_intelligence:0
|
||
| Red Hat | Lightspeed Core |
cpe:/a:redhat:lightspeed_core
|
||
| Red Hat | Red Hat Ansible Automation Platform 2 |
cpe:/a:redhat:ansible_automation_platform:2
|
||
| Red Hat | Red Hat Ansible Automation Platform Ansible Core 2 |
cpe:/a:redhat:ansible_core:2
|
||
| Red Hat | Red Hat Ceph Storage 7 |
cpe:/a:redhat:ceph_storage:7
|
||
| Red Hat | Red Hat Ceph Storage 8 |
cpe:/a:redhat:ceph_storage:8
|
||
| Red Hat | Red Hat Ceph Storage 9 |
cpe:/a:redhat:ceph_storage:9
|
||
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6
|
||
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7
|
||
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8
|
||
| Red Hat | Red Hat Hardened Images |
cpe:/a:redhat:hummingbird:1
|
||
| Red Hat | Red Hat OpenShift AI (RHOAI) |
cpe:/a:redhat:openshift_ai
|
||
| Red Hat | Red Hat OpenShift Container Platform 4 |
cpe:/a:redhat:openshift:4
|
||
| Red Hat | Red Hat OpenStack Platform 17.1 |
cpe:/a:redhat:openstack:17.1
|
||
| Red Hat | Red Hat OpenStack Platform 18.0 |
cpe:/a:redhat:openstack:18.0
|
||
| Red Hat | Red Hat Satellite 6 |
cpe:/a:redhat:satellite:6
|
||
| Red Hat | Red Hat Update Infrastructure 4 for Cloud Providers |
cpe:/a:redhat:rhui:4::el8
|
||
| Red Hat | Red Hat Update Infrastructure 5 |
cpe:/a:redhat:rhui:5::el9
|
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"product": "Red Hat Ansible Automation Platform 2.6",
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"product": "Red Hat Hardened Images",
"vendor": "Red Hat",
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"product": "Red Hat Hardened Images",
"vendor": "Red Hat",
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"cpes": [
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"vendor": "Red Hat",
"versions": [
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"status": "unaffected",
"version": "1776736910",
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{
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"cpes": [
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"packageName": "quay/quay-rhel8",
"product": "Red Hat Quay 3.12",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1776752646",
"versionType": "rpm"
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},
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
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"defaultStatus": "affected",
"packageName": "quay/quay-rhel8",
"product": "Red Hat Quay 3.14",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1779689392",
"versionType": "rpm"
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]
},
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
"cpe:/a:redhat:quay:3.15::el8"
],
"defaultStatus": "affected",
"packageName": "quay/quay-rhel8",
"product": "Red Hat Quay 3.15",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1780891395",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
"cpe:/a:redhat:quay:3.16::el9"
],
"defaultStatus": "affected",
"packageName": "quay/quay-rhel9",
"product": "Red Hat Quay 3.16",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1779204086",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
"cpe:/a:redhat:quay:3.17::el9"
],
"defaultStatus": "affected",
"packageName": "quay/quay-rhel9",
"product": "Red Hat Quay 3.17",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "1779922205",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://catalog.redhat.com/software/containers/",
"cpes": [
"cpe:/a:redhat:quay:3.18::el9"
],
"defaultStatus": "affected",
"packageName": "quay/quay-rhel9",
"product": "Red Hat Quay 3.18",
"vendor": "Red Hat",
"versions": [
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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