CVE-2026-53524

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{"affected": [{"affectedData": [{"product": "weechat", "vendor": "weechat", "versions": [{"status": "affected", "version": ">= 4.3.0, < 4.9.1"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "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."}, {"lang": "es", "value": "WeeChat (Wee Enhanced Environment for Chat) es un cliente de chat gratuito. En las versiones 4.3.0 a 4.9.0, la funci\u00f3n de descompresi\u00f3n permessage-deflate de WebSocket del m\u00f3dulo de retransmisi\u00f3n de WeeChat, relay_websocket_inflate(), no tiene un l\u00edmite superior en el tama\u00f1o de salida. Un usuario de retransmisi\u00f3n autenticado puede enviar una peque\u00f1a trama WebSocket comprimida (~100 bytes) que se descomprime a gigabytes, agotando toda la memoria del servidor y bloqueando todo el proceso de WeeChat. El protocolo API habilita permessage-deflate y requiere autenticaci\u00f3n antes de la actualizaci\u00f3n de WebSocket. La versi\u00f3n 4.9.1 corrige el problema."}], "id": "CVE-2026-53524", "lastModified": "2026-10-14T19:10:00.297", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 2.8, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-53524", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-08-24T20:09:05.967952Z", "version": "2.0.3"}}]}, "published": "2026-08-21T23:16:26.213", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/weechat/weechat/security/advisories/GHSA-v2v4-45wm-5cr3"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://github.com/weechat/weechat/security/advisories/GHSA-v2v4-45wm-5cr3"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Deferred", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-409"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[4.3.0,4.9.1)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "weechat", "source": "cna", "vendor": "weechat"}, "product": "weechat", "vendor": "weechat"}], "created": "2026-08-21T23:30:16.891913+00:00", "updated": "2026-08-21T23:30:17.171062+00:00", "vendors": ["weechat", "weechat$PRODUCT$weechat"]}