{"id":"CVE-2026-87864","state":"PUBLISHED","title":"IMAP APPEND plus CRLF conversion command injection","description":"Enabling `CURLOPT_CRLF` causes curl to advertise the raw input byte count in\nthe `IMAP APPEND {N}` literal while transmitting line-ending expanded data.\nThe server reads only $N$ bytes for the payload, causing the remaining\noverflow bytes to be interpreted and executed as pipelined IMAP commands\nwithin the authenticated session.","publishedAt":"2026-10-20T20:13:13.359Z","updatedAt":"2026-10-30T12:00:45.483Z","severity":{"score":8.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"curl","products":["curl curl"],"affected":[{"vendor":"curl","product":"curl","defaultStatus":"unaffected","versions":[{"version":"8.21.0","status":"affected","lessThanOrEqual":"8.21.0","versionType":"semver"},{"version":"8.20.0","status":"affected","lessThanOrEqual":"8.20.0","versionType":"semver"},{"version":"8.19.0","status":"affected","lessThanOrEqual":"8.19.0","versionType":"semver"},{"version":"8.18.0","status":"affected","lessThanOrEqual":"8.18.0","versionType":"semver"},{"version":"8.17.0","status":"affected","lessThanOrEqual":"8.17.0","versionType":"semver"},{"version":"8.16.0","status":"affected","lessThanOrEqual":"8.16.0","versionType":"semver"},{"version":"8.15.0","status":"affected","lessThanOrEqual":"8.15.0","versionType":"semver"},{"version":"8.14.1","status":"affected","lessThanOrEqual":"8.14.1","versionType":"semver"},{"version":"8.14.0","status":"affected","lessThanOrEqual":"8.14.0","versionType":"semver"},{"version":"8.13.0","status":"affected","lessThanOrEqual":"8.13.0","versionType":"semver"},{"version":"8.12.1","status":"affected","lessThanOrEqual":"8.12.1","versionType":"semver"},{"version":"8.12.0","status":"affected","lessThanOrEqual":"8.12.0","versionType":"semver"},{"version":"8.11.1","status":"affected","lessThanOrEqual":"8.11.1","versionType":"semver"},{"version":"8.11.0","status":"affected","lessThanOrEqual":"8.11.0","versionType":"semver"},{"version":"8.10.1","status":"affected","lessThanOrEqual":"8.10.1","versionType":"semver"},{"version":"8.10.0","status":"affected","lessThanOrEqual":"8.10.0","versionType":"semver"},{"version":"8.9.1","status":"affected","lessThanOrEqual":"8.9.1","versionType":"semver"},{"version":"8.9.0","status":"affected","lessThanOrEqual":"8.9.0","versionType":"semver"},{"version":"8.8.0","status":"affected","lessThanOrEqual":"8.8.0","versionType":"semver"},{"version":"8.7.1","status":"affected","lessThanOrEqual":"8.7.1","versionType":"semver"},{"version":"8.7.0","status":"affected","lessThanOrEqual":"8.7.0","versionType":"semver"},{"version":"8.6.0","status":"affected","lessThanOrEqual":"8.6.0","versionType":"semver"},{"version":"8.5.0","status":"affected","lessThanOrEqual":"8.5.0","versionType":"semver"},{"version":"8.4.0","status":"affected","lessThanOrEqual":"8.4.0","versionType":"semver"},{"version":"8.3.0","status":"affected","lessThanOrEqual":"8.3.0","versionType":"semver"},{"version":"8.2.1","status":"affected","lessThanOrEqual":"8.2.1","versionType":"semver"},{"version":"8.2.0","status":"affected","lessThanOrEqual":"8.2.0","versionType":"semver"},{"version":"8.1.2","status":"affected","lessThanOrEqual":"8.1.2","versionType":"semver"},{"version":"8.1.1","status":"affected","lessThanOrEqual":"8.1.1","versionType":"semver"},{"version":"8.1.0","status":"affected","lessThanOrEqual":"8.1.0","versionType":"semver"},{"version":"8.0.1","status":"affected","lessThanOrEqual":"8.0.1","versionType":"semver"},{"version":"8.0.0","status":"affected","lessThanOrEqual":"8.0.0","versionType":"semver"},{"version":"7.88.1","status":"affected","lessThanOrEqual":"7.88.1","versionType":"semver"},{"version":"7.88.0","status":"affected","lessThanOrEqual":"7.88.0","versionType":"semver"},{"version":"7.87.0","status":"affected","lessThanOrEqual":"7.87.0","versionType":"semver"},{"version":"7.86.0","status":"affected","lessThanOrEqual":"7.86.0","versionType":"semver"},{"version":"7.85.0","status":"affected","lessThanOrEqual":"7.85.0","versionType":"semver"},{"version":"7.84.0","status":"affected","lessThanOrEqual":"7.84.0","versionType":"semver"},{"version":"7.83.1","status":"affected","lessThanOrEqual":"7.83.1","versionType":"semver"},{"version":"7.83.0","status":"affected","lessThanOrEqual":"7.83.0","versionType":"semver"},{"version":"7.82.0","status":"affected","lessThanOrEqual":"7.82.0","versionType":"semver"},{"version":"7.81.0","status":"affected","lessThanOrEqual":"7.81.0","versionType":"semver"},{"version":"7.80.0","status":"affected","lessThanOrEqual":"7.80.0","versionType":"semver"},{"version":"7.79.1","status":"affected","lessThanOrEqual":"7.79.1","versionType":"semver"},{"version":"7.79.0","status":"affected","lessThanOrEqual":"7.79.0","versionType":"semver"},{"version":"7.78.0","status":"affected","lessThanOrEqual":"7.78.0","versionType":"semver"},{"version":"7.77.0","status":"affected","lessThanOrEqual":"7.77.0","versionType":"semver"},{"version":"7.76.1","status":"affected","lessThanOrEqual":"7.76.1","versionType":"semver"},{"version":"7.76.0","status":"affected","lessThanOrEqual":"7.76.0","versionType":"semver"},{"version":"7.75.0","status":"affected","lessThanOrEqual":"7.75.0","versionType":"semver"},{"version":"7.74.0","status":"affected","lessThanOrEqual":"7.74.0","versionType":"semver"},{"version":"7.73.0","status":"affected","lessThanOrEqual":"7.73.0","versionType":"semver"},{"version":"7.72.0","status":"affected","lessThanOrEqual":"7.72.0","versionType":"semver"},{"version":"7.71.1","status":"affected","lessThanOrEqual":"7.71.1","versionType":"semver"},{"version":"7.71.0","sta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APPEND plus CRLF conversion command injection","descriptions":[{"lang":"en","value":"Enabling `CURLOPT_CRLF` causes curl to advertise the raw input byte count in\nthe `IMAP APPEND {N}` literal while transmitting line-ending expanded data.\nThe server reads only $N$ bytes for the payload, causing the remaining\noverflow bytes to be interpreted and executed as pipelined IMAP commands\nwithin the authenticated session."}],"affected":[{"vendor":"curl","product":"curl","defaultStatus":"unaffected","versions":[{"version":"8.21.0","status":"affected","lessThanOrEqual":"8.21.0","versionType":"semver"},{"version":"8.20.0","status":"affected","lessThanOrEqual":"8.20.0","versionType":"semver"},{"version":"8.19.0","status":"affected","lessThanOrEqual":"8.19.0","versionType":"semver"},{"version":"8.18.0","status":"affected","lessThanOrEqual":"8.18.0","versionType":"semver"},{"version":"8.17.0","status":"affected","lessThanOrEqual":"8.17.0","versionType":"semver"},{"version":"8.16.0","status":"affected","lessThanOrEqual":"8.16.0","versionType":"semver"},{"version":"8.15.0","status":"affected","lessThanOrEqual":"8.15.0","versionType":"semver"},{"version":"8.14.1","status":"affected","lessThanOrEqual":"8.14.1","versionType":"semver"},{"version":"8.14.0","status":"affected","lessThanOrEqual":"8.14.0","versionType":"semver"},{"version":"8.13.0","status":"affected","lessThanOrEqual":"8.13.0","versionType":"semver"},{"version":"8.12.1","status":"affected","lessThanOrEqual":"8.12.1","versionType":"semver"},{"version":"8.12.0","status":"affected","lessThanOrEqual":"8.12.0","versionType":"semver"},{"version":"8.11.1","status":"affected","lessThanOrEqual":"8.11.1","versionType":"semver"},{"version":"8.11.0","status":"affected","lessThanOrEqual":"8.11.0","versionType":"semver"},{"version":"8.10.1","status":"affected","lessThanOrEqual":"8.10.1","versionType":"semver"},{"version":"8.10.0","status":"affected","lessThanOrEqual":"8.10.0","versionType":"semver"},{"version":"8.9.1","status":"affected","lessThanOrEqual":"8.9.1","versionType":"semver"},{"version":"8.9.0","status":"affected","lessThanOrEqual":"8.9.0","versionType":"semver"},{"version":"8.8.0","status":"affected","lessThanOrEqual":"8.8.0","versionType":"semver"},{"version":"8.7.1","status":"affected","lessThanOrEqual":"8.7.1","versionType":"semver"},{"version":"8.7.0","status":"affected","lessThanOrEqual":"8.7.0","versionType":"semver"},{"version":"8.6.0","status":"affected","lessThanOrEqual":"8.6.0","versionType":"semver"},{"version":"8.5.0","status":"affected","lessThanOrEqual":"8.5.0","versionType":"semver"},{"version":"8.4.0","status":"affected","lessThanOrEqual":"8.4.0","versionType":"semver"},{"version":"8.3.0","status":"affected","lessThanOrEqual":"8.3.0","versionType":"semver"},{"version":"8.2.1","status":"affected","lessThanOrEqual":"8.2.1","versionType":"semver"},{"version":"8.2.0","status":"affected","lessThanOrEqual":"8.2.0","versionType":"semver"},{"version":"8.1.2","status":"affected","lessThanOrEqual":"8.1.2","versionType":"semver"},{"version":"8.1.1","status":"affected","lessThanOrEqual":"8.1.1","versionType":"semver"},{"version":"8.1.0","status":"affected","lessThanOrEqual":"8.1.0","versionType":"semver"},{"version":"8.0.1","status":"affected","lessThanOrEqual":"8.0.1","versionType":"semver"},{"version":"8.0.0","status":"affected","lessThanOrEqual":"8.0.0","versionType":"semver"},{"version":"7.88.1","status":"affected","lessThanOrEqual":"7.88.1","versionType":"semver"},{"version":"7.88.0","status":"affected","lessThanOrEqual":"7.88.0","versionType":"semver"},{"version":"7.87.0","status":"affected","lessThanOrEqual":"7.87.0","versionType":"semver"},{"version":"7.86.0","status":"affected","lessThanOrEqual":"7.86.0","versionType":"semver"},{"version":"7.85.0","status":"affected","lessThanOrEqual":"7.85.0","versionType":"semver"},{"version":"7.84.0","status":"affected","lessThanOrEqual":"7.84.0","versionType":"semver"},{"version":"7.83.1","status":"affected","lessThanOrEqual":"7.83.1","versionType":"semver"},{"version":"7.83.0","status":"affected","lessThanOrEqual":"7.83.0","versionType":"semver"},{"version":"7.82.0","status":"affected","lessThanOrEqual":"7.82.0","versionType":"semver"},{"version":"7.81.0","status":"affected","lessThanOrEqual":"7.81.0","versionType":"semver"},{"version":"7.80.0","status":"affected","lessThanOrEqual":"7.80.0","versionType":"semver"},{"version":"7.79.1","status":"affected","lessThanOrEqual":"7.79.1","versionType":"semver"},{"version":"7.79.0","status":"affected","lessThanOrEqual":"7.79.0","versionType":"semver"},{"version":"7.78.0","status":"affected","lessThanOrEqual":"7.78.0","versionType":"semver"},{"version":"7.77.0","status":"affected","lessThanOrEqual":"7.77.0","versionType":"semver"},{"version":"7.76.1","status":"affected","lessThanOrEqual":"7.76.1","versionType":"semver"},{"version":"7.76.0","status":"affected","lessThanOrEqual":"7.76.0","versionType":"semver"},{"version":"7.75.0","status":"affected","lessThanOrEqual":"7.75.0","versionType":"semver"},{"version":"7.74.0","status":"affected","lessThanOrEqual":"7.74.0","versionType":"semver"},{"version":"7.73.0","status":"affected","lessThanOrEqual":"7.73.0","versionType":"semver"},{"version":"7.72.0","status":"affected","lessThanOrEqual":"7.72.0","versionType":"semver"},{"version":"7.71.1","status":"affected","lessThanOrEqual":"7.71.1","versionType":"semver"},{"version":"7.71.0"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