{"id":"CVE-2026-77528","published":"2026-09-18T20:17:22.830","lastModified":"2026-09-24T21:25:27.050","description":"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.","cvssScore":5.3,"cvssSeverity":"MEDIUM","cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwes":["CWE-409","CWE-770"],"vendors":[],"products":[],"references":[{"url":"https://github.com/crossbario/autobahn-python/commit/77d323a30b09b1828ad8be2ce6344e056970e613","tags":[]},{"url":"https://github.com/crossbario/autobahn-python/pull/1916","tags":[]},{"url":"https://github.com/crossbario/autobahn-python/releases/tag/v26_7_1","tags":[]},{"url":"https://github.com/crossbario/autobahn-python/security/advisories/GHSA-hxp9-w8x3-p566","tags":[]}],"exploitRefs":[{"url":"https://github.com/crossbario/autobahn-python/commit/77d323a30b09b1828ad8be2ce6344e056970e613","tags":[]},{"url":"https://github.com/crossbario/autobahn-python/pull/1916","tags":[]},{"url":"https://github.com/crossbario/autobahn-python/releases/tag/v26_7_1","tags":[]},{"url":"https://github.com/crossbario/autobahn-python/security/advisories/GHSA-hxp9-w8x3-p566","tags":[]}],"hasPoc":true,"ai":null}