{"id":"CVE-2026-53525","state":"PUBLISHED","title":"WeeChat has Non-Constant-Time Password Hash Comparison in Relay Authentication","description":"WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 0.3.1 through 4.9.0, the WeeChat relay authentication uses non-constant-time string comparison functions (weechat_strcasecmp and strcmp) to verify password hashes and plaintext passwords. An attacker can exploit timing differences to extract the server-computed hash character by character, then authenticate using the correct hash without knowing the password. Version 4.9.1 fixes the issue.","publishedAt":"2026-08-21T22:19:21.278Z","updatedAt":"2026-08-25T16:46:03.941Z","severity":{"score":7.4,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["weechat weechat"],"affected":[{"vendor":"weechat","product":"weechat","versions":[{"version":">= 0.3.4, < 4.9.1","status":"affected"}]}],"references":["https://github.com/weechat/weechat/security/advisories/GHSA-vhv8-g2r9-cwcc"],"weaknesses":["CWE-208"],"ingestedAt":"2026-10-29T20:12:16.098Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/53xxx/CVE-2026-53525.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-53525","state":"PUBLISHED","datePublished":"2026-08-21T22:19:21.278Z","dateUpdated":"2026-08-25T16:46:03.941Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-06-09T17:30:33.456Z"},"containers":{"cna":{"title":"WeeChat has Non-Constant-Time Password Hash Comparison in Relay Authentication","descriptions":[{"lang":"en","value":"WeeChat (Wee Enhanced Environment for Chat) is a free chat client. In versions 0.3.1 through 4.9.0, the WeeChat relay authentication uses non-constant-time string comparison functions (weechat_strcasecmp and strcmp) to verify password hashes and plaintext passwords. An attacker can exploit timing differences to extract the server-computed hash character by character, then authenticate using the correct hash without knowing the password. Version 4.9.1 fixes the issue."}],"affected":[{"vendor":"weechat","product":"weechat","versions":[{"version":">= 0.3.4, < 4.9.1","status":"affected"}]}],"references":[{"url":"https://github.com/weechat/weechat/security/advisories/GHSA-vhv8-g2r9-cwcc","name":"https://github.com/weechat/weechat/security/advisories/GHSA-vhv8-g2r9-cwcc","tags":["x_refsource_CONFIRM"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"HIGH","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.4,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"HIGH","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-208","lang":"en","description":"CWE-208: Observable Timing Discrepancy","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-08-21T22:19:21.278Z"},"source":{"advisory":"GHSA-vhv8-g2r9-cwcc","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/weechat/weechat/security/advisories/GHSA-vhv8-g2r9-cwcc","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-08-25T16:45:37.380114Z","id":"CVE-2026-53525","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-08-25T16:46:03.941Z"}}]}}}