{"id":"DEBIAN-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":"2026-09-25T08:47:21.173826823Z","published":"2026-09-18T20:17:22.830Z","upstream":["CVE-2026-77528"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-77528"}],"affected":[{"package":{"name":"python-autobahn","ecosystem":"Debian:12","purl":"pkg:deb/debian/python-autobahn?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["22.7.1+dfsg1-2","22.7.1+dfsg1-3","22.7.1+dfsg1-4","23.1.2+dfsg1-1","23.1.2+dfsg1-2","24.4.2+dfsg1-1","24.4.2+dfsg1-2","24.4.2+dfsg1-3","24.4.2+dfsg1-4","24.4.2+dfsg1-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77528.json"}},{"package":{"name":"python-autobahn","ecosystem":"Debian:13","purl":"pkg:deb/debian/python-autobahn?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["23.1.2+dfsg1-2","24.4.2+dfsg1-1","24.4.2+dfsg1-2","24.4.2+dfsg1-3","24.4.2+dfsg1-4","24.4.2+dfsg1-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2026-77528.json"}},{"package":{"name":"python-autobahn","ecosystem":"Debian:14","purl":"pkg:deb/debian/python-autobahn?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["23.1.2+dfsg1-2","24.4.2+dfsg1-1","24.4.2+dfsg1-2","24.4.2+dfsg1-3","24.4.2+dfsg1-4","24.4.2+dfsg1-5"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-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"}]}