{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-27459", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-02-19T17:25:31.100Z", "datePublished": "2026-03-17T23:34:28.483Z", "dateUpdated": "2026-09-04T12:04:48.482Z" }, "containers": { "cna": { "title": "pyOpenSSL DTLS cookie callback buffer overflow", "problemTypes": [ { "descriptions": [ { "cweId": "CWE-120", "lang": "en", "description": "CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')", "type": "CWE" } ] } ], "metrics": [ { "cvssV4_0": { "attackVector": "NETWORK", "attackComplexity": "HIGH", "attackRequirements": "PRESENT", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "baseScore": 7.2, "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", "version": "4.0" } } ], "references": [ { "name": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4", "tags": [ "x_refsource_CONFIRM" ], "url": "https://github.com/pyca/pyopenssl/security/advisories/GHSA-5pwr-322w-8jr4" }, { "name": "https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408", "tags": [ "x_refsource_MISC" ], "url": "https://github.com/pyca/pyopenssl/commit/57f09bb4bb051d3bc2a1abd36e9525313d5cd408" }, { "name": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst", "tags": [ "x_refsource_MISC" ], "url": "https://github.com/pyca/pyopenssl/blob/358cbf29c4e364c59930e53a270116249581eaa3/CHANGELOG.rst" } ], "affected": [ { "vendor": "pyca", "product": "pyopenssl", "versions": [ { "version": ">= 22.0.0, < 26.0.0", "status": "affected" } ] } ], "providerMetadata": { "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-03-17T23:34:28.483Z" }, "descriptions": [ { "lang": "en", "value": "pyOpenSSL is a Python wrapper around the OpenSSL library. 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"https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:rhui:4::el8" ], "defaultStatus": "affected", "packageName": "python-redis", "product": "Red Hat Update Infrastructure 4 for Cloud Providers", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:rhui:4::el8" ], "defaultStatus": "affected", "packageName": "python-urllib3", "product": "Red Hat Update Infrastructure 4 for Cloud Providers", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:rhui:5::el9" ], "defaultStatus": "affected", "packageName": "rhui5/cds-kubernetes-rhel9", "product": "Red Hat Update Infrastructure 5", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:rhui:5::el9" ], "defaultStatus": "affected", "packageName": "rhui5/cds-rhel9", "product": "Red Hat Update Infrastructure 5", "vendor": "Red Hat" }, { "collectionURL": "https://access.redhat.com/downloads/content/package-browser/", "cpes": [ "cpe:/a:redhat:rhui:5::el9" ], "defaultStatus": "affected", "packageName": "rhui5/rhua-rhel9", "product": "Red Hat Update Infrastructure 5", "vendor": "Red Hat" } ], "datePublic": "2026-03-17T23:34:28.483Z", "descriptions": [ { "lang": "en", "value": "A flaw was found in pyOpenSSL. The set_cookie_generate_callback callback function can be used to generate DTLS cookies. When the callback returns a cookie string or byte sequence longer than 256 bytes, a buffer overflow can be triggered due to a missing bounds checking before copying the data to a fixed-size buffer provided by the underlying OpenSSL library." } ], "metrics": [ { "other": { "content": { "namespace": "https://access.redhat.com/security/updates/classification/", "value": "Important" }, "type": "Red Hat severity rating" } }, { "cvssV3_1": { "attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1" }, "format": "CVSS" } ], "problemTypes": [ { "descriptions": [ { "cweId": "CWE-120", "description": "Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')", "lang": "en", "type": "CWE" } ] } ], "references": [ { "tags": [ "vdb-entry", "x_refsource_REDHAT" ], "url": "https://access.redhat.com/security/cve/CVE-2026-27459" }, { "name": "RHBZ#2448503", "tags": [ "issue-tracking", "x_refsource_REDHAT" ], "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2448503" }, { "tags": [ "x_sadp-csaf-vex" ], "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-27459.json" }, { "tags": [ "vendor-advisory", "x_refsource_REDHAT" ], "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": [ 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"value": "RHSA-2026:14874: Red Hat Satellite 6.16 for RHEL 8, Red Hat Satellite 6.16 for RHEL 9" }, { "lang": "en", "value": "RHSA-2026:13508: Red Hat Ansible Automation Platform 2.6 for RHEL 9" }, { "lang": "en", "value": "RHSA-2026:14873: Red Hat Satellite 6.17 for RHEL 9" }, { "lang": "en", "value": "RHSA-2026:14835: Red Hat Satellite 6.18 for RHEL 9" }, { "lang": "en", "value": "RHSA-2026:13553: Red Hat Ansible Automation Platform 2.5" }, { "lang": "en", "value": "RHSA-2026:13545: Red Hat Ansible Automation Platform 2.6" }, { "lang": "en", "value": "RHSA-2026:59153: Red Hat Ansible Automation Platform 2.7" }, { "lang": "en", "value": "RHSA-2026:48758: Red Hat Hardened Images" }, { "lang": "en", "value": "RHSA-2026:7224: Red Hat Hardened Images" }, { "lang": "en", "value": "RHSA-2026:11856: Red Hat Quay 3.12" }, { "lang": "en", "value": "RHSA-2026:21017: Red Hat Quay 3.14" }, { "lang": "en", "value": "RHSA-2026:24853: Red Hat Quay 3.15" }, { "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-2026:48085: Red Hat Quay 3.18" }, { "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" } ], "timeline": [ { "lang": "en", "time": "2026-03-18T00:01:41.404Z", "value": "Reported to Red Hat." }, { "lang": "en", "time": "2026-03-17T23:34:28.483Z", "value": "Made public." } ], "title": "pyOpenSSL: DTLS cookie callback buffer overflow", "workarounds": [ { "lang": "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_adpType": "supplier", "x_generator": { "engine": "sadp-cli 1.0.0" }, "providerMetadata": { "orgId": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "shortName": "redhat-SADP", "dateUpdated": "2026-09-04T12:04:48.482Z" } } ] } }