{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53524","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-06-09T17:30:33.456Z","datePublished":"2026-08-21T22:18:23.432Z","dateUpdated":"2026-08-24T20:09:16.871Z"},"containers":{"cna":{"title":"WeeChat has a Decompression Bomb in Relay WebSocket (DoS)","problemTypes":[{"descriptions":[{"cweId":"CWE-409","lang":"en","description":"CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/weechat/weechat/security/advisories/GHSA-v2v4-45wm-5cr3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/weechat/weechat/security/advisories/GHSA-v2v4-45wm-5cr3"}],"affected":[{"vendor":"weechat","product":"weechat","versions":[{"version":">= 4.3.0, < 4.9.1","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-08-21T22:18:23.432Z"},"descriptions":[{"lang":"en","value":"WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 4.3.0 through 4.9.0, the WeeChat relay module's WebSocket permessage-deflate decompression function relay_websocket_inflate() has no upper bound on output size. An authenticated relay user can send a small compressed WebSocket frame (~100 bytes) that decompresses to gigabytes, exhausting all server memory and crashing the entire WeeChat process. The api protocol enables permessage-deflate and requires authentication before WebSocket upgrade. Version 4.9.1 patches the issue."}],"source":{"advisory":"GHSA-v2v4-45wm-5cr3","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/weechat/weechat/security/advisories/GHSA-v2v4-45wm-5cr3","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-24T20:09:05.967952Z","id":"CVE-2026-53524","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-08-24T20:09:16.871Z"}}]}}