{"id":"UBUNTU-CVE-2026-77528","details":"Autobahn Python is a WebSocket and WAMP implementation for Python that supports Twisted and asyncio. Prior to 26.7.1, WebSocket endpoints that accept permessage-deflate and rely on maxMessagePayloadSize enforce that limit against the compressed frame length before inflation but do not recheck the decompressed message size before delivery. A remote unauthenticated client can send a valid compressed frame below the configured wire-size limit that expands beyond the application message limit, causing oversized data to be allocated, joined, validated, and passed to application callbacks. This can create resource-exhaustion pressure, but the advisory does not establish confidentiality or integrity impact. This issue is fixed in version 26.7.1.","modified":"2026-09-21T21:40:25.304066487Z","published":"2026-09-21T00:00:00Z","upstream":["CVE-2026-77528"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-77528"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-77528"},{"type":"REPORT","url":"https://github.com/crossbario/autobahn-python/security/advisories/GHSA-hxp9-w8x3-p566"},{"type":"REPORT","url":"https://github.com/crossbario/autobahn-python/pull/1916"},{"type":"REPORT","url":"https://github.com/crossbario/autobahn-python/commit/77d323a30b09b1828ad8be2ce6344e056970e613"},{"type":"REPORT","url":"https://github.com/crossbario/autobahn-python/releases/tag/v26_7_1"}],"affected":[{"package":{"name":"python-autobahn","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/python-autobahn?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.10.3+dfsg1-2","0.10.3+dfsg1-3","0.10.3+dfsg1-5"],"ecosystem_specific":{"binaries":[{"binary_version":"0.10.3+dfsg1-5","binary_name":"python-autobahn"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77528.json"}},{"package":{"name":"python-autobahn","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/python-autobahn?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.14.1+dfsg1-2ubuntu1","17.10.1+dfsg1-2"],"ecosystem_specific":{"binaries":[{"binary_version":"17.10.1+dfsg1-2","binary_name":"python-autobahn"},{"binary_name":"python3-autobahn","binary_version":"17.10.1+dfsg1-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77528.json"}},{"package":{"name":"python-autobahn","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/python-autobahn?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["17.10.1+dfsg1-5","17.10.1+dfsg1-6"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-autobahn","binary_version":"17.10.1+dfsg1-6"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77528.json"}},{"package":{"name":"python-autobahn","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/python-autobahn?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["17.10.1+dfsg1-7","21.11.1+dfsg1-2","21.11.1+dfsg1-2build1"],"ecosystem_specific":{"binaries":[{"binary_version":"21.11.1+dfsg1-2build1","binary_name":"python3-autobahn"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77528.json"}},{"package":{"name":"python-autobahn","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/python-autobahn?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["22.7.1+dfsg1-3","22.7.1+dfsg1-4"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-autobahn","binary_version":"22.7.1+dfsg1-4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77528.json"}},{"package":{"name":"python-autobahn","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/python-autobahn?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["23.1.2+dfsg1-2","24.4.2+dfsg1-4","24.4.2+dfsg1-5"],"ecosystem_specific":{"binaries":[{"binary_name":"python3-autobahn","binary_version":"24.4.2+dfsg1-5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77528.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"type":"Ubuntu","score":"medium"}]}