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

Vulnerability from cvelistv5 – Published: 2026-03-17 23:34 – Updated: 2026-07-01 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.
Severity
7.2 (High)
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
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
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-2026:11916 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-2026:11996 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     cpe:/a:redhat:ansible_automation_platform:2.5::el8
    cpe:/a:redhat:ansible_automation_platform_developer:2.5::el8
    cpe:/a:redhat:ansible_automation_platform_inside:2.5::el8
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Red Hat RHUI 4 for RHEL 8     cpe:/a:redhat:rhui:4::el8
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Red Hat Red Hat Satellite 6.16 for RHEL 8     cpe:/a:redhat:satellite:6.16::el8
    cpe:/a:redhat:satellite_capsule:6.16::el8
    cpe:/a:redhat:satellite_utils:6.16::el8
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Red Hat Red Hat Ansible Automation Platform 2.5 for RHEL 9     cpe:/a:redhat:ansible_automation_platform:2.5::el9
    cpe:/a:redhat:ansible_automation_platform_developer:2.5::el9
    cpe:/a:redhat:ansible_automation_platform_inside:2.5::el9
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Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 9     cpe:/a:redhat:ansible_automation_platform:2.6::el9
    cpe:/a:redhat:ansible_automation_platform_developer:2.6::el9
    cpe:/a:redhat:ansible_automation_platform_inside:2.6::el9
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Red Hat Red Hat Satellite 6.16 for RHEL 9     cpe:/a:redhat:satellite:6.16::el9
    cpe:/a:redhat:satellite_capsule:6.16::el9
    cpe:/a:redhat:satellite_utils:6.16::el9
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Red Hat Red Hat Satellite 6.17 for RHEL 9     cpe:/a:redhat:satellite:6.17::el9
    cpe:/a:redhat:satellite_capsule:6.17::el9
    cpe:/a:redhat:satellite_utils:6.17::el9
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Red Hat Red Hat Satellite 6.18 for RHEL 9     cpe:/a:redhat:satellite:6.18::el9
    cpe:/a:redhat:satellite_capsule:6.18::el9
    cpe:/a:redhat:satellite_maintenance:6.18::el9
    cpe:/a:redhat:satellite_utils:6.18::el9
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Red Hat Red Hat Ansible Automation Platform 2.5     cpe:/a:redhat:ansible_automation_platform:2.5::el8
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Red Hat Red Hat Ansible Automation Platform 2.6     cpe:/a:redhat:ansible_automation_platform:2.6::el9
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Red Hat Red Hat Hardened Images     cpe:/a:redhat:hummingbird:1
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Red Hat Red Hat Quay 3.10     cpe:/a:redhat:quay:3.10::el8
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Red Hat Red Hat Quay 3.12     cpe:/a:redhat:quay:3.12::el8
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Red Hat Red Hat Quay 3.14     cpe:/a:redhat:quay:3.14::el8
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Red Hat Red Hat Quay 3.15     cpe:/a:redhat:quay:3.15::el8
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Red Hat Red Hat Quay 3.16     cpe:/a:redhat:quay:3.16::el9
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Red Hat Red Hat Quay 3.17     cpe:/a:redhat:quay:3.17::el9
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Red Hat Red Hat Quay 3.9     cpe:/a:redhat:quay:3.9::el8
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Red Hat Red Hat Trusted Artifact Signer 1.4     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 OpenShift AI (RHOAI)     cpe:/a:redhat:openshift_ai
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Red Hat Red Hat Ansible Automation Platform 2.6 for RHEL 10     cpe:/a:redhat:ansible_automation_platform:2.6::el10
    cpe:/a:redhat:ansible_automation_platform_developer:2.6::el10
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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 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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      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-27459\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-03-18T19:52:08.536876Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-03-18T19:52:12.530Z\"}}], \"cna\": {\"title\": \"pyOpenSSL DTLS cookie callback buffer overflow\", \"source\": {\"advisory\": \"GHSA-5pwr-322w-8jr4\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 7.2, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"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\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"HIGH\", \"attackRequirements\": \"PRESENT\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"HIGH\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"HIGH\"}}], \"affected\": [{\"vendor\": \"pyca\", \"product\": \"pyopenssl\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 22.0.0, \u003c 26.0.0\"}]}], \"references\": [{\"url\": \"https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4\", \"name\": \"https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408\", \"name\": \"https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst\", \"name\": \"https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"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\": \"2026-03-18T19:52:15.812Z\", \"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",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





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.


Detection rules are retrieved from Rulezet.