CVE-2026-27459 (GCVE-0-2026-27459)

Vulnerability from cvelistv5 – Published: 2026-03-17 23:34 – Updated: 2026-07-20 12:04
VLAI
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.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
  • CWE-120 - Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
Assigner
References
URL Tags
https://github.com/pyca/pyopenssl/security/adviso… x_refsource_CONFIRM
https://github.com/pyca/pyopenssl/commit/57f09bb4… x_refsource_MISC
https://github.com/pyca/pyopenssl/blob/358cbf29c4… 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/v… 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-2026:7224 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-2026:11916 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
Impacted products
Vendor Product Version
pyca pyopenssl Affected: >= 22.0.0, < 26.0.0
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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
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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
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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
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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
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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
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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
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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
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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
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Red Hat RHUI 4 for RHEL 8 Unaffected: 0:24.1.0-2.el8ui , < * (rpm)
    cpe:/a:redhat:rhui:4::el8
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Red Hat Red Hat Ansible Automation Platform 2.5 Unaffected: 1777398315 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.5::el8
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Red Hat Red Hat Ansible Automation Platform 2.5 Unaffected: 1777403872 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.5::el8
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Red Hat Red Hat Ansible Automation Platform 2.6 Unaffected: 1777390240 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.6::el9
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Red Hat Red Hat Ansible Automation Platform 2.6 Unaffected: 1777296732 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.6::el9
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Red Hat Red Hat Ansible Automation Platform 2.6 Unaffected: 1777391447 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.6::el9
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Red Hat Red Hat Ansible Automation Platform 2.6 Unaffected: 1777299023 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.6::el9
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Red Hat Red Hat Ansible Automation Platform 2.6 Unaffected: 1777387242 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.6::el9
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Red Hat Red Hat Ansible Automation Platform 2.6 Unaffected: 1777390333 , < * (rpm)
    cpe:/a:redhat:ansible_automation_platform:2.6::el9
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Red Hat Red Hat Hardened Images Unaffected: 26.0.0-1.1.hum1 , < * (rpm)
    cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat Quay 3.1 Unaffected: 1776736910 , < * (rpm)
    cpe:/a:redhat:quay:3.10::el8
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Red Hat Red Hat Quay 3.12 Unaffected: 1776752646 , < * (rpm)
    cpe:/a:redhat:quay:3.12::el8
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Red Hat Red Hat Quay 3.14 Unaffected: 1779689392 , < * (rpm)
    cpe:/a:redhat:quay:3.14::el8
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Red Hat Red Hat Quay 3.15 Unaffected: 1780891395 , < * (rpm)
    cpe:/a:redhat:quay:3.15::el8
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Red Hat Red Hat Quay 3.16 Unaffected: 1779204086 , < * (rpm)
    cpe:/a:redhat:quay:3.16::el9
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Red Hat Red Hat Quay 3.17 Unaffected: 1779922205 , < * (rpm)
    cpe:/a:redhat:quay:3.17::el9
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Red Hat Red Hat Quay 3.9 Unaffected: 1776782369 , < * (rpm)
    cpe:/a:redhat:quay:3.9::el8
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Red Hat Red Hat Trusted Artifact Signer 1.4 Unaffected: 1775815407 , < * (rpm)
    cpe:/a:redhat:trusted_artifact_signer:1.4::el9
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Red Hat Red Hat Ansible Automation Platform 2     cpe:/a:redhat:ansible_automation_platform:2
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Red Hat Red Hat Ansible Automation Platform Ansible Core 2     cpe:/a:redhat:ansible_core:2
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Red Hat Red Hat Enterprise Linux 6     cpe:/o:redhat:enterprise_linux:6
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Red Hat Red Hat Enterprise Linux 7     cpe:/o:redhat:enterprise_linux:7
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Red Hat Red Hat Enterprise Linux 8     cpe:/o:redhat:enterprise_linux:8
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Red Hat Red Hat OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat OpenShift Container Platform 4     cpe:/a:redhat:openshift:4
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Red Hat Red Hat OpenStack Platform 17.1     cpe:/a:redhat:openstack:17.1
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Red Hat Red Hat OpenStack Platform 18.0     cpe:/a:redhat:openstack:18.0
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Red Hat Red Hat Satellite 6     cpe:/a:redhat:satellite:6
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Show details on NVD website

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{\"lang\": \"en\", \"value\": \"RHSA-2026:19375: Red Hat Quay 3.16\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:22465: Red Hat Quay 3.17\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:11916: Red Hat Quay 3.1\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:11996: Red Hat Quay 3.9\"}, {\"lang\": \"en\", \"value\": \"RHSA-2026:8437: Red Hat Trusted Artifact Signer 1.4\"}], \"x_adpType\": \"supplier\", \"datePublic\": \"2026-03-17T23:34:28.483Z\", \"references\": [{\"url\": \"https://access.redhat.com/security/cve/CVE-2026-27459\", \"tags\": [\"vdb-entry\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://bugzilla.redhat.com/show_bug.cgi?id=2448503\", \"name\": \"RHBZ#2448503\", \"tags\": [\"issue-tracking\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27459.json\", \"tags\": [\"x_sadp-csaf-vex\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:13512\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:10754\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14874\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:13508\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14873\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:14835\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:13553\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:13545\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:7224\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": 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\"en\", \"value\": \"To mitigate this flaw, ensure the callback provided to the set_cookie_generate_callback function strictly limits the returned cookie string or byte sequence to under 256 bytes.\"}], \"x_generator\": {\"engine\": \"sadp-cli 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in pyOpenSSL. 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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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-120\", \"description\": \"CWE-120: Buffer Copy without Checking Size of Input (\u0027Classic Buffer Overflow\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-03-17T23:34:28.483Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-27459\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-20T12:04:52.880Z\", \"dateReserved\": \"2026-02-19T17:25:31.100Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-03-17T23:34:28.483Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
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    }
  }
}



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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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Detection rules are retrieved from Rulezet.

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