{"id":"CVE-2026-87864","title":"IMAP APPEND plus CRLF conversion command injection","summary":"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 byte…","severity":"none","cwe":["CWE-130"],"vendor":"curl","product":"curl","affected":["curl >= 8.21.0 <= 8.21.0","curl >= 8.20.0 <= 8.20.0","curl >= 8.19.0 <= 8.19.0","curl >= 8.18.0 <= 8.18.0","curl >= 8.17.0 <= 8.17.0","curl >= 8.16.0 <= 8.16.0","curl >= 8.15.0 <= 8.15.0","curl >= 8.14.1 <= 8.14.1","curl >= 8.14.0 <= 8.14.0","curl >= 8.13.0 <= 8.13.0","curl >= 8.12.1 <= 8.12.1","curl >= 8.12.0 <= 8.12.0","curl >= 8.11.1 <= 8.11.1","curl >= 8.11.0 <= 8.11.0","curl >= 8.10.1 <= 8.10.1","curl >= 8.10.0 <= 8.10.0","curl >= 8.9.1 <= 8.9.1","curl >= 8.9.0 <= 8.9.0","curl >= 8.8.0 <= 8.8.0","curl >= 8.7.1 <= 8.7.1","curl >= 8.7.0 <= 8.7.0","curl >= 8.6.0 <= 8.6.0","curl >= 8.5.0 <= 8.5.0","curl >= 8.4.0 <= 8.4.0","curl >= 8.3.0 <= 8.3.0","curl >= 8.2.1 <= 8.2.1","curl >= 8.2.0 <= 8.2.0","curl >= 8.1.2 <= 8.1.2","curl >= 8.1.1 <= 8.1.1","curl >= 8.1.0 <= 8.1.0","curl >= 8.0.1 <= 8.0.1","curl >= 8.0.0 <= 8.0.0","curl >= 7.88.1 <= 7.88.1","curl >= 7.88.0 <= 7.88.0","curl >= 7.87.0 <= 7.87.0","curl >= 7.86.0 <= 7.86.0","curl >= 7.85.0 <= 7.85.0","curl >= 7.84.0 <= 7.84.0","curl >= 7.83.1 <= 7.83.1","curl >= 7.83.0 <= 7.83.0","curl >= 7.82.0 <= 7.82.0","curl >= 7.81.0 <= 7.81.0","curl >= 7.80.0 <= 7.80.0","curl >= 7.79.1 <= 7.79.1","curl >= 7.79.0 <= 7.79.0","curl >= 7.78.0 <= 7.78.0","curl >= 7.77.0 <= 7.77.0","curl >= 7.76.1 <= 7.76.1","curl >= 7.76.0 <= 7.76.0","curl >= 7.75.0 <= 7.75.0"],"published":"2026-10-20","updated":"2026-10-20","sourceUpdated":"2026-10-20T20:13:13.359Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-87864","references":[{"url":"https://curl.se/docs/CVE-2026-87864.json","label":"json"},{"url":"https://curl.se/docs/CVE-2026-87864.html","label":"www"},{"url":"https://hackerone.com/reports/3972403","label":"issue"}],"tags":["cve.org"],"ingestedAt":"2026-10-20T21:19:21.286Z","slug":"CVE-2026-87864","body":"## Overview\n\nEnabling `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.\n\n## Affected\n\n- `curl >= 8.21.0 <= 8.21.0`\n- `curl >= 8.20.0 <= 8.20.0`\n- `curl >= 8.19.0 <= 8.19.0`\n- `curl >= 8.18.0 <= 8.18.0`\n- `curl >= 8.17.0 <= 8.17.0`\n- `curl >= 8.16.0 <= 8.16.0`\n- `curl >= 8.15.0 <= 8.15.0`\n- `curl >= 8.14.1 <= 8.14.1`\n- `curl >= 8.14.0 <= 8.14.0`\n- `curl >= 8.13.0 <= 8.13.0`\n- `curl >= 8.12.1 <= 8.12.1`\n- `curl >= 8.12.0 <= 8.12.0`\n- `curl >= 8.11.1 <= 8.11.1`\n- `curl >= 8.11.0 <= 8.11.0`\n- `curl >= 8.10.1 <= 8.10.1`\n- `curl >= 8.10.0 <= 8.10.0`\n- `curl >= 8.9.1 <= 8.9.1`\n- `curl >= 8.9.0 <= 8.9.0`\n- `curl >= 8.8.0 <= 8.8.0`\n- `curl >= 8.7.1 <= 8.7.1`\n- `curl >= 8.7.0 <= 8.7.0`\n- `curl >= 8.6.0 <= 8.6.0`\n- `curl >= 8.5.0 <= 8.5.0`\n- `curl >= 8.4.0 <= 8.4.0`\n- `curl >= 8.3.0 <= 8.3.0`\n- `curl >= 8.2.1 <= 8.2.1`\n- `curl >= 8.2.0 <= 8.2.0`\n- `curl >= 8.1.2 <= 8.1.2`\n- `curl >= 8.1.1 <= 8.1.1`\n- `curl >= 8.1.0 <= 8.1.0`\n- `curl >= 8.0.1 <= 8.0.1`\n- `curl >= 8.0.0 <= 8.0.0`\n- `curl >= 7.88.1 <= 7.88.1`\n- `curl >= 7.88.0 <= 7.88.0`\n- `curl >= 7.87.0 <= 7.87.0`\n- `curl >= 7.86.0 <= 7.86.0`\n- `curl >= 7.85.0 <= 7.85.0`\n- `curl >= 7.84.0 <= 7.84.0`\n- `curl >= 7.83.1 <= 7.83.1`\n- `curl >= 7.83.0 <= 7.83.0`\n- `curl >= 7.82.0 <= 7.82.0`\n- `curl >= 7.81.0 <= 7.81.0`\n- `curl >= 7.80.0 <= 7.80.0`\n- `curl >= 7.79.1 <= 7.79.1`\n- `curl >= 7.79.0 <= 7.79.0`\n- `curl >= 7.78.0 <= 7.78.0`\n- `curl >= 7.77.0 <= 7.77.0`\n- `curl >= 7.76.1 <= 7.76.1`\n- `curl >= 7.76.0 <= 7.76.0`\n- `curl >= 7.75.0 <= 7.75.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}