{"affected":[{"defaultStatus":"unaffected","ecosystem":"cargo","packageName":"rustls","product":"rustls","source":"CNA: VulnCheck","vendor":"rustls","versions":[{"lessThan":"0.23.46","status":"affected","version":"0.23.44","versionType":"semver"},{"status":"unaffected","version":"0.23.46","versionType":"semver"}]}],"cveId":"CVE-2026-123612","cwes":["CWE-696"],"description":"rustls 0.23.44 and 0.23.45 contain an information disclosure vulnerability that sends application data buffered before the handshake completes to the client-facing server when Encrypted Client Hello is rejected. Because start_traffic() queues plaintext from ClientConnection::writer() before sending the ech_required alert, the authenticated public_name server receives data intended for the inner server.","epss":null,"exploits":[],"kev":null,"metrics":[{"score":4.6,"severity":"medium","source":"CNA: VulnCheck","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N","version":"4.0"},{"score":2.3,"severity":"low","source":"CNA: VulnCheck","vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","version":"3.1"}],"modifiedAt":1794101916873,"publishedAt":1794101916873,"references":[{"source":"CNA: VulnCheck","tags":["vendor-advisory"],"url":"https://github.com/rustls/rustls/security/advisories/GHSA-vp88-798v-h67f"},{"source":"CNA: VulnCheck","tags":["third-party-advisory"],"url":"https://www.vulncheck.com/advisories/rustls-0.23.44-and-0.23.45-ech-rejection-application-data-disclosure"}],"remediation":[],"revision":"e54c543c930ed805fcfd8c450af0474b3e75a69eb9fae708e33993edc5a76fef","sources":[{"modifiedAt":1794101916873,"name":"CNA: VulnCheck","retrievedAt":1794103851229,"url":"https://www.cve.org/CVERecord?id=CVE-2026-123612"}],"ssvc":null,"status":"published","title":"rustls 0.23.44 and 0.23.45 ECH Rejection Application Data Disclosure","updatedAt":1794103851229}