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Vainbrand"},{"lang":"en","type":"remediation developer","value":"Daniel Stenberg"}],"descriptions":[{"lang":"en","value":"A vulnerability exists where a connection requiring TLS incorrectly reuses an\nexisting unencrypted connection from the same connection pool. If an initial\ntransfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request\nto that same host bypasses the TLS requirement and instead transmit data\nunencrypted."}],"problemTypes":[{"descriptions":[{"description":"CWE-319 Cleartext Transmission of Sensitive Information","lang":"en"}]}],"providerMetadata":{"dateUpdated":"2026-05-13T08:27:04.538Z","orgId":"2499f714-1537-4658-8207-48ae4bb9eae9","shortName":"curl"},"references":[{"name":"json","url":"https://curl.se/docs/CVE-2026-4873.json"},{"name":"www","url":"https://curl.se/docs/CVE-2026-4873.html"},{"name":"issue","url":"https://hackerone.com/reports/3621851"}],"title":"connection reuse ignores TLS requirement"}},"cveMetadata":{"assignerOrgId":"2499f714-1537-4658-8207-48ae4bb9eae9","assignerShortName":"curl","cveId":"CVE-2026-4873","datePublished":"2026-05-13T08:27:04.538Z","dateReserved":"2026-03-26T05:38:02.098Z","dateUpdated":"2026-05-13T19:30:04.825Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-05-13 13:01:55","lastModifiedDate":"2026-05-13 20:16:23","problem_types":["CWE-319","CWE-319 Cleartext Transmission of Sensitive Information","CWE-319 CWE-319 Cleartext Transmission of Sensitive Information"],"metrics":{"cvssMetricV31":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N","baseScore":5.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"HIGH","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"NONE"},"exploitabilityScore":2.2,"impactScore":3.6}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"4873","Ordinal":"1","Title":"connection reuse ignores TLS requirement","CVE":"CVE-2026-4873","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"4873","Ordinal":"1","NoteData":"A vulnerability exists where a connection requiring TLS incorrectly reuses an\nexisting unencrypted connection from the same connection pool. If an initial\ntransfer is made in clear-text (via IMAP, SMTP, or POP3), a subsequent request\nto that same host bypasses the TLS requirement and instead transmit data\nunencrypted.","Type":"Description","Title":"connection reuse ignores TLS requirement"}]}}}